CN213689292U - Super-hydrophobic surface resistance reduction and boiling heat exchange synergistic performance testing device - Google Patents
Super-hydrophobic surface resistance reduction and boiling heat exchange synergistic performance testing device Download PDFInfo
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- CN213689292U CN213689292U CN202022377533.5U CN202022377533U CN213689292U CN 213689292 U CN213689292 U CN 213689292U CN 202022377533 U CN202022377533 U CN 202022377533U CN 213689292 U CN213689292 U CN 213689292U
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Abstract
The utility model belongs to the technical field of surface properties tests, a super hydrophobic surface drag reduction and boiling heat transfer synergistic performance testing device is provided, this test device mainly comprises mobile device, high temperature heating device, pressure drop measurement system, temperature measurement system, and mobile device loops through bolted connection by upper cover plate, runner plate, super hydrophobic surface, base and is cuboid sandwich structure, and wherein, a recess is seted up to the base and is used for placing high temperature heating device, and high temperature heating device includes: the device comprises an electric heating sheet, a carrier, a contact copper sheet and a lead; the test device can simultaneously carry out the synergistic effect test of the flowing boiling heat exchange and the resistance reduction characteristic of the super-hydrophobic surface, enlarges the application range of the super-hydrophobic surface, has compact structure, quick assembly and disassembly, small contact thermal resistance and high flowing boiling stability, and can meet the requirements of repeatability experiments and parametric research.
Description
Technical Field
The utility model relates to a super hydrophobic surface drag reduction and boiling heat transfer synergy capability test device belongs to surface performance test technical field.
Background
The super-hydrophobic surface is a bionic material, and the super-hydrophobic property of the bionic material is determined by two factors: firstly, the surface of the material is in a micro-nano composite structure, and secondly, the surface of the material is covered with a low surface energy material. Most of the existing researches only aim at the resistance reduction effect of a super-hydrophobic surface, the micro-nano structure on the super-hydrophobic surface has the characteristics of increasing bubble nucleation points so as to enhance boiling heat transfer and regulate and control forced convection heat transfer, and the micro-nano structure has important research significance in the fields of aerospace, high-performance microelectronics, automobile industry and the like requiring both heat dissipation and energy consumption, and Chinese patent application publication No. CN107631958A discloses a small-sized testing device for testing the resistance reduction performance of a super-hydrophobic material, wherein a PIV technology is utilized to monitor a flow field and time-average velocity distribution so as to realize the resistance reduction performance test of the super-hydrophobic material, but the PIV equipment is expensive in cost and is difficult to be generally applied; secondly, the problems of drag reduction and heat transfer under the condition of phase change are not considered; the single resistance testing system has narrow application range and is difficult to integrate to form general use. Therefore, a testing device capable of simultaneously performing flow boiling heat transfer and drag reduction performance is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at only considering its drag reduction performance, equipment cost height, the current situation that the surface was torn open and is traded the difficulty when measuring hydrophobic surface performance to the tradition, providing a super hydrophobic surface drag reduction and boiling heat transfer synergy property testing arrangement, can realize that the drag reduction and the boiling heat transfer performance, equipment cost of testing super hydrophobic surface are low, the device dismouting is fast, the measuring accuracy is high under the gas-liquid two-phase flow condition simultaneously.
The technical scheme of the utility model:
a device for testing the synergic performance of drag reduction and boiling heat exchange of a super-hydrophobic surface comprises a flow device 1, a high-temperature heating device 2, a pressure drop measuring system 3 and a temperature measuring system 4; the flow device 1 comprises: the device comprises an upper cover plate 1-1, a runner plate 1-2, a super-hydrophobic surface 1-3 and a base 1-4; the periphery of the upper cover plate 1-1, the runner plate 1-2 and the base 1-4 is provided with a plurality of threaded through holes, and the upper cover plate 1-1, the runner plate 1-2, the super-hydrophobic surface 1-3 and the base 1-4 are sequentially and tightly attached and detachably connected through bolts; the high-temperature heating apparatus 2 includes: the high-temperature heating device comprises an electric heating piece 2-1, a carrier 2-2, a contact copper piece 2-3 and a lead 2-4, wherein a groove is formed in the base 1-4 and used for mounting a high-temperature heating device, and a plurality of through holes are formed in the groove so that the lead and a thermocouple can penetrate through and conduct the contact copper piece 2-3 on the carrier 2-2 conveniently; the electric heating sheet 2-1 is aligned with the super-hydrophobic surface 1-3 and the carrier 2-2 under the extrusion action and is placed in a groove of the base 1-4, and a lead conducts the electric heating sheet through a contact copper sheet; the pressure drop measuring system 3 includes: the pressure taking hole 3-1 and a differential pressure transmitter connected with the pressure taking hole; the temperature measurement system 4 includes: the inlet and outlet thermocouples 4-1 and 4-2 are connected with contact copper sheets at the top ends thereof; the super-hydrophobic surface that awaits measuring heats with high temperature heating device, and the deionized water after boiling the degasification is heated when flowing through super-hydrophobic surface through the flow device and reaches the phase transition point and takes place the phase transition, carries out real-time supervision to super-hydrophobic surface flow upper point temperature through temperature measurement system, measures the real-time change condition of fluid flow super-hydrophobic surface back pressure differential through pressure drop measurement system simultaneously, compares the parameter that will obtain with the surface parameter of control group, and then calculates the drag reduction and the boiling synergistic properties that obtain super-hydrophobic surface that awaits measuring.
Furthermore, the upper cover plate 1-1 is made of transparent polysulfone material, so that the conditions of long-term high-temperature operation and flow visualization can be met;
furthermore, the runner plate 1-2 is made of silica gel material, and plays a role of a sealing gasket while providing a runner, so that a water path is prevented from leaking;
furthermore, a fluid mixing cavity is arranged at the water inlet and the water outlet of the base 1-4; an inlet section is arranged at the upstream of the super-hydrophobic surface 1-3 for full hydraulic development, and a steady flow section is arranged at the downstream for full mixing with an outlet;
further, a silica gel gasket is arranged below the carrier 2-2 and used for adjusting the height of the carrier according to the super-hydrophobic surfaces with different thicknesses so as to realize good thermal contact and electrical contact;
furthermore, the contact copper sheet and the lead or the thermocouple are connected in a welding mode;
furthermore, the inlet and outlet of the flow passage plate are in a gradually reducing and gradually expanding shape, and are provided with the flow straightener 1-21.
Above technical scheme can see, the utility model has the advantages of it is following:
1. the device can test the resistance reduction performance of the super-hydrophobic surface, can also realize the heat transfer performance test under the condition of two-phase flow through a high-temperature heating system, and can better explore the application of the super-hydrophobic surface in the phase change technology.
2. The upper cover plate is made of transparent polysulfone material, bubbles and flowing behaviors can be visually observed without additionally arranging a glass window, and the device can operate under a high-temperature working condition for a long time.
3. The utility model discloses well heating device arranges the base recess in, directly with super hydrophobic surface laminating, compact structure has reduced thermal contact resistance, avoids because of the calculation error that the heat conduction process produced.
4. The flow channel plate is independent, on one hand, the flow channel with the required section can be obtained only by replacing different flow channel plates, the processing cost and the dismounting time are reduced, on the other hand, the grid-shaped structure adopted at the inlet and the outlet avoids the flow pattern disorder caused by sudden shrinkage and sudden expansion of the flow channel, and the fluid quickly enters a fully developed state.
The utility model discloses a comprehensive properties on super hydrophobic surface can be fully, aassessment comprehensively to drag reduction and boiling heat transfer test, for deep discussion super hydrophobic surface provides the judgement basis in wider field application.
Drawings
FIG. 1 is a perspective view of the overall structure of the device of the present invention;
FIG. 2 is a schematic view showing the connection of the parts of the device of the present invention;
FIG. 3 is a perspective view of the flow field plate;
FIG. 4 is a schematic view of the carrier and the installation of the contact copper sheet, the lead wire and the thermocouple;
in the figure: 1 a flow device; 2 high-temperature heating device; 3 a pressure drop measuring system; 4, a temperature measuring system; 1-1, an upper cover plate; 1-2 flow channel plates; 1-21 a rectifying grid; 1-3 superhydrophobic surfaces; 1-4 bases; 2-1 electrical heating sheet; 2-2 of a carrier; 2-3 contact copper sheet; 2-4 conducting wires; 3-1, pressure tapping; 4-1 inlet and outlet thermocouples; 4-2 thermocouple.
Detailed Description
Referring to fig. 1-4, the utility model relates to a super hydrophobic surface drag reduction and boiling heat transfer synergy performance testing arrangement, the testing arrangement wholly is a cuboid sandwich structure, includes: the device comprises a flow device 1, a high-temperature heating device 2, a pressure drop measuring system 3 and a temperature measuring system 4; the flow device 1 comprises: the device comprises an upper cover plate 1-1, a runner plate 1-2, a super-hydrophobic surface 1-3 and a base 1-4; the periphery of the upper cover plate 1-1, the runner plate 1-2 and the base 1-4 is provided with a plurality of threaded through holes, and the upper cover plate 1-1, the runner plate 1-2, the super-hydrophobic surface 1-3 and the base 1-4 are sequentially and tightly attached and detachably connected through bolts; the high-temperature heating apparatus 2 includes: the high-temperature heating device comprises an electric heating piece 2-1, a carrier 2-2, a contact copper piece 2-3 and a lead 2-4, wherein a groove is formed in the base 1-4 and used for mounting a high-temperature heating device, and a plurality of through holes are formed in the groove so that the lead and a thermocouple can penetrate through and conduct the contact copper piece 2-3 on the carrier 2-2 conveniently; the electric heating sheet 2-1 is aligned with the super-hydrophobic surface 1-3 and the carrier 2-2 under the extrusion action and is placed in a groove of the base 1-4, and a lead conducts the electric heating sheet through a contact copper sheet 2-3; the pressure drop measuring system 3 includes: the pressure tapping hole 3-1 and the attached differential pressure transmitter are not shown in the attached drawings; the temperature measurement system 4 includes: the inlet and outlet thermocouples 4-1 and 4-2 are connected with contact copper sheets at the top ends thereof;
as an optimal technical solution of the utility model: the upper cover plate is made of transparent polysulfone material, the conditions of long-term high-temperature operation and flow visualization can be met, the runner plate 1-2 is made of silica gel material, the runner plate plays a role of a sealing gasket while providing a runner and prevents a water path from leaking, the inlet and the outlet of the runner plate are arranged in a gradually-reduced and gradually-expanded manner, and the inlet and the outlet of the runner plate are provided with the flow gates 1-21; the water inlet and the water outlet of the base 1-4 are provided with fluid mixing cavities; an inlet section is arranged at the upstream of the super-hydrophobic surface 1-3 for full hydraulic development, and a steady flow section is arranged at the downstream for full mixing with an outlet; a silica gel gasket is also arranged below the carrier and used for adjusting the height of the carrier according to the super-hydrophobic surfaces with different thicknesses so as to realize good thermal contact and electrical contact; the connection mode of the contact copper sheets 2-3 and the lead or the thermocouple is welding.
The process of detecting the super-hydrophobic surface by the drag reduction and boiling test device is as follows
1. Before testing, firstly, a lead 2-4 and a thermocouple 4-2 penetrate upwards from the bottom end of a carrier and then are welded on a contact copper sheet 2-3, the welded contact copper sheet is slightly pressed in a groove on the carrier 2-2 with force, all the contact copper sheets are ensured to be placed on the same horizontal plane, the carrier is aligned with the super-hydrophobic surface 1-3 under the extrusion action of an upper cover plate 1-1, a runner plate 1-2 and a bottom plate 1-4 and is placed in the groove of the bottom plate, and a silica gel gasket is placed at the bottom of the groove of the bottom plate, so that the electric heating sheet is in good electric contact and thermal contact with the contact copper sheet and the super-hydrophobic surface.
2. And connecting boiled and degassed deionized water into an inlet of the flow device through a connector, enabling the deionized water to flow through a channel formed by the flow channel plate 1-2 and the super-hydrophobic surface 1-3 in a surrounding manner, starting a temperature control system, adjusting a set value of a working condition to meet a thermal balance requirement, and testing the super-hydrophobic surface through a pressure drop testing system and a temperature measuring system after various parameters are stable.
3. And (3) after the test of one surface is finished, loosening the bolts at the periphery, replacing the needed superhydrophobic surface 1-3, and repeating the steps 1 and 2 to test the next surface.
Claims (10)
1. A device for testing the synergic performance of drag reduction and boiling heat exchange of a super-hydrophobic surface is characterized in that the device for testing the synergic performance of drag reduction and boiling heat exchange of the super-hydrophobic surface is of a cuboid sandwich structure and comprises a flow device (1), a high-temperature heating device (2), a pressure drop measuring system (3) and a temperature measuring system (4);
the flow device (1) comprises an upper cover plate (1-1), a flow channel plate (1-2), a super-hydrophobic surface (1-3) and a base (1-4); a plurality of threaded through holes are formed in the peripheries of the upper cover plate (1-1), the runner plate (1-2) and the base (1-4), and the upper cover plate (1-1), the runner plate (1-2), the super-hydrophobic surface (1-3) and the base (1-4) are sequentially and tightly attached and detachably connected through bolts;
the high-temperature heating device (2) comprises an electric heating piece (2-1), a carrier (2-2), a contact copper piece (2-3) and a lead (2-4), a groove is formed in the base (1-4) and used for mounting the high-temperature heating device (2), and a plurality of through holes are formed in the groove, so that the lead (2-4) and the thermocouple (4-2) can conveniently penetrate through the contact copper piece (2-3) on the conductive carrier (2-2); the electric heating sheet (2-1) is aligned with the super-hydrophobic surface (1-3) and the carrier (2-2) from top to bottom under the extrusion effect and is placed in a groove of the base (1-4), and the electric heating sheet (2-1) is conducted through the lead (2-4) by contacting the copper sheet (2-3);
the pressure drop measuring system (3) comprises a pressure taking hole (3-1) and a differential pressure transmitter connected with the pressure taking hole;
the temperature measuring system (4) comprises an inlet and outlet thermocouple (4-1), and a contact copper sheet (2-3) connected with the thermocouple (4-2) and the top end of the thermocouple;
the method comprises the steps that the super-hydrophobic surface (1-3) to be tested is heated by a high-temperature heating device (2), boiled and degassed deionized water is heated to a phase change point to generate phase change when flowing through the super-hydrophobic surface (1-3) through a flowing device, the temperature of each point on the flow direction of the super-hydrophobic surface (1-3) is monitored in real time through a temperature measuring system (4), meanwhile, the real-time change situation of the pressure difference of the fluid flowing through the super-hydrophobic surface (1-3) is measured out through a pressure drop measuring system (3), the obtained parameters are compared with the surface parameters of a control group, and the resistance reduction and boiling heat exchange synergistic performance of the super-hydrophobic surface to be tested is evaluated.
2. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of claim 1, wherein the upper cover plate (1-1) is made of polysulfone material, so as to meet the conditions of long-term high-temperature operation and flow visualization.
3. The device for testing the synergic performance of the super-hydrophobic surface drag reduction and the boiling heat exchange according to claim 1 or 2, characterized in that the flow channel plate (1-2) is made of silica gel material, and has the function of a sealing gasket while providing a flow channel to prevent a water channel from leaking, and the inlet and outlet of the flow channel plate (1-2) are tapered and gradually expanded and are provided with flow straightener (1-21).
4. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of the claim 1 or 2, characterized in that the water inlet and outlet of the base (1-4) are provided with a fluid mixing cavity; the upstream of the super-hydrophobic surface (1-3) is provided with an inlet section for full hydraulic development, and the downstream is provided with a steady flow section for full mixing with an outlet.
5. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of the claim 3, characterized in that the water inlet and outlet of the base (1-4) are provided with a fluid mixing cavity; the upstream of the super-hydrophobic surface (1-3) is provided with an inlet section for full hydraulic development, and the downstream is provided with a steady flow section for full mixing with an outlet.
6. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of the claim 1, 2 or 5 is characterized in that a silica gel gasket is further installed below the carrier (2-2) and used for adjusting the height of the carrier (2-2) according to the superhydrophobic surfaces with different thicknesses so as to realize good thermal contact and electrical contact.
7. The device for testing the synergic performance of super-hydrophobic surface drag reduction and boiling heat exchange of claim 3 characterized in that a silica gel gasket is further installed under the carrier (2-2) for adjusting the height of the carrier (2-2) according to the super-hydrophobic surfaces with different thicknesses to achieve good thermal and electrical contact.
8. The device for testing the synergic performance of super-hydrophobic surface drag reduction and boiling heat exchange of claim 4 is characterized in that a silica gel gasket is further installed below the carrier (2-2) for adjusting the height of the carrier (2-2) according to super-hydrophobic surfaces with different thicknesses to realize good thermal and electrical contact.
9. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of the claim 1, 2, 5, 7 or 8 is characterized in that the connection mode of the contact copper sheets (2-3) and the lead wires (2-4) or the thermocouples (4-2) is welding.
10. The device for testing the synergic performance of drag reduction and boiling heat exchange of the superhydrophobic surface of claim 6, characterized in that the connection manner of the contact copper sheets (2-3) and the lead wires (2-4) or the thermocouples (4-2) is welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022377533.5U CN213689292U (en) | 2020-10-23 | 2020-10-23 | Super-hydrophobic surface resistance reduction and boiling heat exchange synergistic performance testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022377533.5U CN213689292U (en) | 2020-10-23 | 2020-10-23 | Super-hydrophobic surface resistance reduction and boiling heat exchange synergistic performance testing device |
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| CN213689292U true CN213689292U (en) | 2021-07-13 |
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