CN117739732B - A conductive fluid vortex generation method based on magnetic field and heat exchange enhancement device - Google Patents
A conductive fluid vortex generation method based on magnetic field and heat exchange enhancement device Download PDFInfo
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- CN117739732B CN117739732B CN202410148318.8A CN202410148318A CN117739732B CN 117739732 B CN117739732 B CN 117739732B CN 202410148318 A CN202410148318 A CN 202410148318A CN 117739732 B CN117739732 B CN 117739732B
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- 230000001105 regulatory effect Effects 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 7
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明涉及磁流体动力及增强换热技术领域，具体涉及一种基于磁场的导电流体涡发生方法及换热增强装置。本发明所提供的基于磁场的导电流体涡发生方法，包括如下步骤：基于换热流道布设磁场，磁场方向与所述换热流道内导电流体的流动方向垂直；在所述换热流道的侧壁布设电极，所述电极的布设方向与所述磁场方向平行，所述电极的一端与所述导电流体接触，所述电极的另一端与电源电连接；通过所述电极向所述导电流体引入电流，所述电流用于改变所述导电流体的运动方向以产生涡结构。本发明能够解决当前金属流体在换热流道中出现的热量集中问题，并为当前工业需求提供更高效率的传热解决方案。
The present invention relates to the field of magnetohydrodynamics and enhanced heat exchange technology, and specifically to a method for generating vortices for a conductive fluid based on a magnetic field and a heat exchange enhancement device. The method for generating vortices for a conductive fluid based on a magnetic field provided by the present invention comprises the following steps: arranging a magnetic field based on a heat exchange channel, wherein the direction of the magnetic field is perpendicular to the flow direction of the conductive fluid in the heat exchange channel; arranging electrodes on the side walls of the heat exchange channel, wherein the arrangement direction of the electrodes is parallel to the direction of the magnetic field, wherein one end of the electrodes is in contact with the conductive fluid, and the other end of the electrodes is electrically connected to a power source; and introducing an electric current into the conductive fluid through the electrodes, wherein the electric current is used to change the movement direction of the conductive fluid to generate a vortex structure. The present invention can solve the problem of heat concentration in the current metal fluid in the heat exchange channel, and provide a more efficient heat transfer solution for current industrial needs.
Description
Technical Field
The invention relates to the technical field of magnetohydrodynamic and enhanced heat exchange, in particular to a conductive fluid vortex generating method based on a magnetic field and a heat exchange enhancing device.
Background
The flow of metal fluids and heat transfer are important in high temperature environments, such as in the nuclear, metallurgical industries. For example, a U-shaped runner in nuclear fusion, metal fluid easily forms angular vortex (flow stagnation area), heat concentration is easily caused, and structural safety is endangered. Therefore, there is a need for a magnetic field-based conductive fluid vortex generation method and heat exchange enhancement device to solve the heat concentration problem of the current metal fluid in the heat exchange flow channel and provide a more efficient heat transfer solution for the current industry needs.
Disclosure of Invention
Aiming at the defects of the prior art and the demands of practical application, the invention provides a conductive fluid vortex generating method based on a magnetic field and a heat exchange enhancing device, which aim to solve the problem of heat concentration of the current metal fluid in a heat exchange flow channel and provide a heat transfer solution with higher efficiency for the current industrial demands.
In a first aspect, the present invention provides a method for generating a vortex of a conductive fluid based on a magnetic field, comprising the steps of: a magnetic field is distributed on the basis of a heat exchange flow channel, and the direction of the magnetic field is perpendicular to the flowing direction of conductive fluid in the heat exchange flow channel; arranging electrodes on the side wall of the heat exchange flow channel, wherein the arrangement direction of the electrodes is parallel to the magnetic field direction, one end of each electrode is in contact with the conductive fluid, and the other end of each electrode is electrically connected with a power supply; an electrical current is introduced to the conductive fluid through the electrode, the electrical current being used to change the direction of movement of the conductive fluid to create an eddy current structure.
The invention provides a conductive fluid vortex generating method based on a magnetic field, which has the following gain: according to the invention, the electrodes are arranged on the side wall of the heat exchange flow channel to introduce current to the conductive fluid, so that the partial vortex shedding of the conductive fluid around the electrodes is realized, and the problem of heat concentration is solved; furthermore, the invention can realize the space control of the partial vortex shedding by designing the number and the arrangement position of the electrodes; furthermore, the invention can also control the vortex strength by adjusting parameters such as the amplitude, the frequency and the like of the current.
Optionally, the method for generating the conductive fluid vortex based on the magnetic field further comprises the following steps: and acquiring a real-time heat distribution diagram of the heat exchange flow channel, and determining a target electrode based on an abnormal hot spot in the real-time heat distribution diagram, wherein the target electrode is one or more electrodes close to the abnormal hot spot. The selectable item screens the target electrode through the real-time heat distribution map of the heat exchange flow channel, thereby accurately and efficiently solving the problem of heat concentration in the heat exchange flow channel.
Optionally, the determining the target electrode based on the abnormal hot spot in the real-time thermal profile includes the following steps: determining a first position of an abnormal hot spot projected on a side wall in the real-time heat distribution map; traversing a second location of a plurality of electrodes on the sidewall; and acquiring the relative distance between the second position corresponding to any electrode and the first position, and determining a target electrode according to the relative distance. The selectable item screens the target electrode according to the relative distance between the abnormal hot spot and the electrode, so that the problem of heat concentration at the abnormal hot spot is solved more accurately and efficiently.
Optionally, the relative distance between the second position corresponding to the target electrode and the first position is the global minimum. The heat concentration problem at the abnormal hot spot can be accurately and efficiently solved by conducting electricity to the electrode closest to the abnormal hot spot.
Optionally, the method for generating the conductive fluid vortex based on the magnetic field further comprises the following steps: regulating the current and introducing the regulated current to the conductive fluid using the electrode.
In a second aspect, the present invention provides a heat exchange enhancing device, the heat exchange enhancing device comprising a heat exchange flow channel and a conductive fluid, the heat exchange flow channel being in contact with a heat source, the heat exchange flow channel being for providing a flow channel for the conductive fluid, the conductive fluid being for absorbing heat from the heat source; the magnetic field module is used for distributing the magnetic field in the conductive fluid vortex generating method based on the magnetic field based on the heat exchange flow channel, and the magnetic field direction is perpendicular to the flow direction of the conductive fluid in the heat exchange flow channel; a vortex generating module comprising an electrode as described in the method of generating vortex of a conductive fluid based on a magnetic field, the vortex generating module being configured to introduce a current through the electrode to the conductive fluid, the current being configured to change a direction of movement of the conductive fluid to create a vortex structure.
The heat exchange enhancement device provided by the invention has the following gains: according to the invention, through the vortex generating module, the vortex can be rapidly generated locally, and the position of the vortex generated locally can be controlled, so that the problem of heat concentration in the current heat exchange flow channel is solved; compared with a device for realizing heat exchange efficiency enhancement by using a traditional vortex generator, the heat exchange enhancement device provided by the invention has the advantages that no extra magnetic fluid pressure drop exists, the conductivity of the conductive fluid is high, the resistance is small, and the heat efficiency enhancement realized by introducing current is far greater than the energy loss required by the introduced current, so that the overall energy utilization rate is greatly enhanced.
Optionally, the heat exchange enhancement device further comprises a control module, wherein the control module is used for controlling the conduction state between the electrode and the power supply. The optional item can realize the space control of the partial vortex shedding in the heat exchange flow channel by arranging the control module.
Optionally, the heat exchange enhancement device provided by the invention further comprises a heat monitoring module, wherein the heat monitoring module is used for acquiring a real-time heat distribution map of the heat exchange flow channel; the control module is used for controlling the conduction state between the electrode and the power supply according to the abnormal hot spot in the real-time thermal distribution diagram. This selectable item is through setting up heat monitoring module to through the synergism of heat monitoring module and control module, can accurate control vortex emergence position, with the heat concentrated problem of high-efficient solution unusual hot spot department.
Optionally, the heat exchange enhancing device provided by the invention further comprises: and the adjusting module is used for adjusting the current. The selectable item can control the intensity of vortex by setting the adjusting module to control relevant parameters such as current intensity and the like.
Optionally, the heat exchange enhancing device provided by the invention further comprises: and the power supply module is used for providing the current. The power supply module is arranged in the selectable option, so that the heat exchange device can be used more flexibly, and the applicability of the heat exchange device is improved.
Drawings
FIG. 1 is a flow chart of a method for generating eddy current of a conductive fluid based on a magnetic field according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a heat exchange enhancement device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heat exchange enhancing device according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the invention will be described in detail below, it being noted that the embodiments described herein are for illustration only and are not intended to limit the invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known circuits, software, or methods have not been described in detail in order not to obscure the invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale.
In one embodiment, referring to fig. 1, fig. 1 is a flowchart of a method for generating a conductive fluid vortex based on a magnetic field according to an embodiment of the present invention. As shown in fig. 1, the method for generating the conductive fluid vortex based on the magnetic field provided by the embodiment of the invention comprises the following steps: s01, arranging a magnetic field based on the heat exchange flow channel, wherein the direction of the magnetic field is perpendicular to the flowing direction of the conductive fluid in the heat exchange flow channel.
It is easy to understand that the heat exchange flow channel is high temperature resistant material equipment for providing a flow channel for the conductive fluid under the high temperature condition, and part of the outer side wall of the heat exchange flow channel is contacted with the heat source, and the low temperature conductive fluid is introduced into the heat exchange flow channel, so that the flowing low temperature conductive fluid can be utilized to absorb and take away the heat of the heat source.
Further, the conductive fluid is a fluid having conductive properties, including in particular but not limited to a metal fluid and a molten electrolyte. In an industrial application scenario, the conductive fluid is typically a metal fluid, i.e. a liquid metal, such as liquid, liquid sodium, liquid lithium or liquid GaInSn.
In one or more other embodiments, the method for generating a conductive fluid vortex based on a magnetic field according to the embodiments of the present invention further includes the following steps: and S02, arranging electrodes on the side wall of the heat exchange flow channel, wherein the arrangement direction of the electrodes is parallel to the magnetic field direction, one end of each electrode is in contact with the conductive fluid, and the other end of each electrode is electrically connected with a power supply.
Further, the materials, the number and the arrangement positions of the electrodes can be selected according to actual situations or requirements. In one or more embodiments, the electrode is a copper needle; in other one or more embodiments, the electrode may be a zinc electrode, a nickel electrode, or other conductive electrode.
In order to solve the problem of heat concentration in the heat exchange flow channel more precisely, in this or these embodiments, the method for generating a conductive fluid vortex based on a magnetic field further includes the following steps: and acquiring a real-time heat distribution diagram of the heat exchange flow channel, and determining a target electrode based on an abnormal hot spot in the real-time heat distribution diagram, wherein the target electrode is one or more electrodes close to the abnormal hot spot.
The abnormal hot spot in the real-time heat distribution map is used for representing the position of a region with flow stagnation phenomenon in the heat exchange flow channel. It is readily apparent that the temperature at the location of the region where the flow stagnation phenomenon occurs is higher than in the normal flow velocity region due to heat concentration of the conductive fluid in the flow stagnation region. Further, the real-time thermal profile may be obtained by an infrared radiation thermometer or a thermal imager, or may be obtained by other thermal sensing display devices.
Further, the determining the target electrode based on the abnormal hot spot in the real-time thermal profile includes the following steps: determining a first position of an abnormal hot spot projected on a side wall in the real-time heat distribution map; traversing a second location of a plurality of electrodes on the sidewall; and acquiring the relative distance between the second position corresponding to any electrode and the first position, and determining a target electrode according to the relative distance.
Specifically, a corresponding plane coordinate system is constructed based on the side wall range characterized by the real-time thermal distribution diagram, and first positions corresponding to one or more abnormal hot spot positions are marked in the plane coordinate system. When an abnormal hot spot position appears in the real-time heat distribution diagram, taking a central coordinate corresponding to the abnormal hot spot position as a first position A; similarly, when a plurality of abnormal hot spot positions appear in the real-time heat distribution diagram, the distribution takes the central coordinates corresponding to the abnormal hot spot positions as the first position，,Wherein, the method comprises the steps of, wherein,A number indicating a first position is provided,Represents a positive integer number of the cells,Representing the total number of first locations.
In this planar coordinate system, a second position corresponding to the electrode arrangement positionsWherein, the method comprises the steps of, wherein,,Wherein, the method comprises the steps of, wherein,A number indicating a second position is provided,Represents a positive integer number of the cells,Representing the total number of second positions. Further, a relative distance between a second position corresponding to any electrode and the first position is obtained, wherein the distance between any first position and the second positionThe following calculation formula is satisfied: Wherein, the method comprises the steps of, wherein, Expressed in a planar coordinate systemA first one of the plurality of positions,Expressed in a planar coordinate systemAnd a second position.
And screening one or more electrodes with the minimum distance from the first position coordinates from the plurality of electrodes according to the calculation result of the relative distance to serve as target electrodes so as to conduct a power supply to control local vortex generation. In order to more accurately solve the problem of heat concentration in the heat exchange flow channel and reduce energy consumption, in this or these embodiments, the relative distance between the second position corresponding to the selected target electrode and the first position is globally minimum.
In one or more other embodiments, the method for generating a conductive fluid vortex based on a magnetic field according to the embodiments of the present invention further includes the following steps: s03, introducing current to the conductive fluid through the electrode, wherein the current is used for changing the movement direction of the conductive fluid so as to generate an eddy structure.
The type of power source connected to the electrodes of the present invention may be selected as desired. Specifically, in this or these embodiments, the power supply is an alternating power supply, and the alternating current/voltage provided by the power supply may be adjusted according to actual requirements, so that the electrode is used to introduce the adjusted current into the conductive fluid, so as to obtain a better eddy current generation effect.
Further, alternating current with the same direction as the external magnetic field is introduced into the conductive fluid through the electrodes, so that the flowing state of the conductive fluid around the electrodes is changed to generate an eddy structure so as to enhance the convection effect, and the local heat exchange efficiency of the conductive fluid is enhanced.
Based on the magnetic field-based conductive fluid vortex generating method, in one embodiment, a heat exchange enhancing device is further provided, please refer to fig. 2, fig. 2 is a schematic block diagram of the heat exchange enhancing device according to an embodiment of the present invention. As shown in fig. 2, the heat exchange enhancement device comprises a heat exchange flow channel, a conductive fluid, a magnetic field module and a vortex generation module.
The heat exchange flow channel is in contact with a heat source and is used for providing a flow channel for the conductive fluid, and the conductive fluid is used for absorbing heat of the heat source; the magnetic field module is used for distributing the magnetic field in the conductive fluid vortex generating method based on the magnetic field based on the heat exchange flow channel, and the magnetic field direction is perpendicular to the flow direction of the conductive fluid in the heat exchange flow channel; the vortex generating module comprises an electrode according to the method for generating vortex of conductive fluid based on magnetic field, and is used for introducing current to the conductive fluid through the electrode, and the current is used for changing the movement direction of the conductive fluid so as to generate a vortex structure.
In one or more other embodiments, referring to fig. 2, the heat exchange enhancing device provided by the present invention further includes a regulating module, where the regulating module is configured to regulate the current. Further, the adjustment module may perform amplitude adjustment, frequency adjustment and phase adjustment on the current, in particular adjustment operations, may be more practical.
In one or more other embodiments, referring to fig. 2, the heat exchange enhancing device provided by the present invention further includes a power module, where the power module is configured to provide the current. Further, the type of the power module can be selected according to requirements. In this or these embodiments, the power supply is an alternating power supply, and the alternating current/voltage provided by the power supply may be adjusted according to the actual requirements, so that the electrode is used to introduce the adjusted current into the conductive fluid, so as to obtain a better vortex generating effect.
In one or more other embodiments, referring to fig. 2, the heat exchange enhancing device further includes a control module, where the control module is configured to control a conduction state between the electrode and the power supply. Specifically, each electrode should be connected with an alternating current power supply through a wire, a switching device is arranged in the wire, and the control module is used for realizing the control of the running state of the switching device according to a set related program, so as to control the conduction state between the electrode and the power supply. Further, in order to solve the problem of heat concentration in the heat exchange flow channel more precisely, the control module can control the running state of the switching device according to the heat distribution condition in the heat exchange flow channel
In one or more other embodiments, please refer to fig. 3, fig. 3 is a schematic structural diagram of a heat exchange enhancing device according to an embodiment of the present invention. The heat exchange flow channel 1 of the heat exchange enhancement device is a box-shaped heat exchange flow channel, openings at two ends of the heat exchange flow channel are used for conducting the conductive fluid, one opposite side wall is in contact with a heat source, and the other opposite side wall is used for arranging a vortex generating module. Typically, the side area in contact with the heat source is larger than the side area in which the vortex generating module is disposed.
In this embodiment, the magnetic field module includes a first magnetic field sub-module 21 and a second magnetic field sub-module 22, the first magnetic field sub-module 21 is disposed on a side of the box-shaped heat exchange flow channel where the vortex generating module is disposed, the second magnetic field sub-module 22 is disposed on a side of the box-shaped heat exchange flow channel away from the first magnetic field sub-module 21, and magnetism of a side of the first magnetic field sub-module 21 close to the box-shaped heat exchange flow channel is opposite to magnetism of a side of the second magnetic field sub-module 22 close to the box-shaped heat exchange flow channel.
In this embodiment, the vortex generating module includes a plurality of electrodes 41, any electrode 41 is disposed on a side wall of the heat exchange flow channel 1 which is not contacted with the heat source, one end of the electrode 41 is contacted with the conductive fluid inside the heat exchange flow channel 1, the other end of the electrode 41 is contacted with the air outside the heat exchange flow channel 11, and the vortex generating module is used for introducing an alternating current into the conductive fluid inside the heat exchange flow channel 1 through the electrode 41, and controlling the flowing direction of the conductive fluid to generate a vortex structure by using the alternating current, wherein the conducting direction of the alternating current is the same as the direction of the external magnetic field.
In this embodiment, the vortex generating module uses one or more mechanical arms 42 to clamp a conductive wire to electrically connect one or more electrodes, and the strength, frequency, waveform and other related parameters of the alternating current flowing into the electrodes by the conductive wire can be set according to the actual requirements. It will be readily appreciated that the connection between the current and the electrode may be achieved by other structures or means.
In this embodiment, the heat exchange enhancement device provided by the present invention further includes a heat monitoring module 3, where the heat monitoring module 3 is configured to obtain a real-time heat distribution map of the heat exchange flow channel. As shown in fig. 3, the heat monitoring module 3 is disposed on a side of the first magnetic field sub-module 21 close to the box-shaped heat exchange flow channel, and a certain space exists between the first magnetic field sub-module 21 and the box-shaped heat exchange flow channel. It is readily understood that the field of view of the thermal monitoring module 3 includes at least all electrodes in the spacing condition.
Further, a control module of the heat exchange enhancement device is used for controlling the conduction state between the electrode and the power supply according to abnormal hot spots in the real-time heat distribution diagram. Specifically, the control module may determine the target electrode based on the abnormal hot spot in the real-time thermal profile, thereby controlling the conduction state between the target electrode and the corresponding power supply.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (7)
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| JP2003511640A (en) * | 1999-10-14 | 2003-03-25 | クリクタフォビッチ、イゴール・エー | Electrostatic fluid accelerator |
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| US5437421A (en) * | 1992-06-26 | 1995-08-01 | British Technology Group Usa, Inc. | Multiple electromagnetic tiles for boundary layer control |
| US6146103A (en) * | 1998-10-09 | 2000-11-14 | The Regents Of The University Of California | Micromachined magnetohydrodynamic actuators and sensors |
| US20190316613A1 (en) * | 2018-04-17 | 2019-10-17 | GM Global Technology Operations LLC | Internal flow control using plasma actuators |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003511640A (en) * | 1999-10-14 | 2003-03-25 | クリクタフォビッチ、イゴール・エー | Electrostatic fluid accelerator |
| CN103791764A (en) * | 2014-01-27 | 2014-05-14 | 南京航空航天大学 | Heat exchange enhancement method and device for non-contact vortex generator |
| CN106767084A (en) * | 2016-12-01 | 2017-05-31 | 中国船舶重工集团公司第七〇九研究所 | A kind of contactless fluid-mixing strengthened heat exchange method and heat-exchanger rig |
| CN108733089A (en) * | 2018-08-24 | 2018-11-02 | 合肥锐联传热技术有限公司 | A kind of contactless flowing and conduct heat control method and its device |
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