CN109540963B - Reinforced heat exchange experimental system based on pipe wall excitation - Google Patents
Reinforced heat exchange experimental system based on pipe wall excitation Download PDFInfo
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- CN109540963B CN109540963B CN201811576391.6A CN201811576391A CN109540963B CN 109540963 B CN109540963 B CN 109540963B CN 201811576391 A CN201811576391 A CN 201811576391A CN 109540963 B CN109540963 B CN 109540963B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses an enhanced heat exchange experimental system based on pipe wall excitation. The stirring device is arranged in the water tank, the drain pipe is arranged at the bottom of the water tank, fluid flows out of the water tank and then sequentially passes through the electric pump set, the first flow regulating valve, the flowmeter, the first pressure sensor and the first temperature sensor to reach the excitation test piece, the excitation test piece is fixed on the excitation table, the excitation rod is rigidly fixed on the excitation table, the upper end of the excitation rod is propped against the excitation test piece, the high-speed photographing system is positioned above the excitation test piece, and the fluid flows out of the excitation test piece and then returns to the water tank through the second temperature sensor, the second pressure sensor and the second flow regulating valve. The invention can heat and excite the fluid, observe the state of the fluid inside, apply vibration excitation with different amplitude, different frequency and different vibration modes to the fluid, study the flow pattern of a secondary flow structure such as longitudinal vortex and the like generated by the near wall surface after excitation, and the flow heat exchange rule thereof, and find the corresponding relation between the vibration excitation and the convective heat exchange intensity.
Description
Technical Field
The invention relates to the field of enhanced heat exchange, in particular to an enhanced heat exchange experimental system based on pipe wall excitation.
Background
In the existing power battery and electronic chip liquid cooling technology, in order to obtain a larger surface-to-surface ratio, a small-scale liquid cooling channel is generally adopted, but the flow is in a laminar flow state most of the time, so that the flow cannot be fully developed, and the heat exchange capacity of the flow is limited. The flow rate is increased to obtain higher heat exchange efficiency, but the flow resistance is increased to a degree far higher than the heat exchange performance, so that the practical significance is lost.
Disclosure of Invention
In order to overcome the defects of the prior art, in order to obtain the heat exchange performance as large as possible under the condition of minimum external input, the invention provides an enhanced heat exchange experimental system based on pipe wall excitation, which can be used for researching a longitudinal vortex and other secondary flow structures generated near the wall after high-frequency low-amplitude vibration excitation is applied to the wall and the influence rule of the secondary flow structures on flow heat exchange between the pipe wall and main flow fluid, and can be used for improving the convection heat exchange coefficient with smaller pressure loss and achieving the purpose of enhancing the convection heat exchange.
A reinforced heat exchange experimental system based on pipe wall excitation is characterized in that a stirring device is arranged in a water tank, a drain pipe is arranged at the bottom of the water tank, fluid flows out of the water tank and sequentially passes through an electric pump set, a first flow regulating valve, a flowmeter, a first pressure sensor and a first temperature sensor to reach an excitation test piece, the excitation test piece is fixed on a workbench surface of an excitation table, an excitation rod is rigidly fixed on the excitation table, the upper end of the excitation rod is propped against the excitation test piece, a high-speed photographing system is positioned above the excitation test piece and rigidly fixed on the ground through a bracket, and the fluid returns to the water tank through a second temperature sensor, a second pressure sensor and a second flow regulating valve after flowing out of the excitation test piece.
The vibration excitation test piece is fixed on a workbench surface of the vibration excitation table through a fixing support, an internal rectangular water channel is integrally machined on the vibration excitation test piece, water inlet and outlet ports and pipe joints are connected to two sides of the internal rectangular water channel, a heating rod hole is machined on the back of the cavity, a heating rod is inserted in the heating rod hole, the front of the cavity is organic observation glass adhered to the water channel, the bottom of the cavity is a vibrating diaphragm, the vibrating diaphragm is fixed in a groove machined in the main water channel through a vibrating diaphragm pressing plate, the vibrating diaphragm pressing plate is fixed on the wall surface of the main water channel through bolts, and the vibration excitation rod is propped against the vibrating diaphragm.
The vibrating diaphragm is made of engineering flexible materials or metal thin walls, has the thickness of 0.5mm, has rigidity and can deform after being excited by vibration.
The vibration excitation rod is a mechanical signal amplifier, is made of metal, is in a solid slender rod shape, has a plane top, is propped against the center of the vibrating membrane, has a transverse fixing rod at the bottom and is fixed on the working table surface of the vibration excitation table, and the vibration excitation rod transmits vibration excitation generated by the vibration excitation table to the center of the vibrating membrane.
The excitation test piece releases fluorescent dye when fluid flows through, displays flow lines generated when the fluid flows, and is used for observing the fluid flow form in the excitation test piece in the experiment so as to carry out visual research by adopting a high-speed photographic system.
The beneficial effects of the invention are as follows: an experimental system that heats and excites a fluid and observes the state of the fluid inside. The method can apply vibration excitation with different amplitude, different frequency and different vibration modes to the fluid, research the flow pattern of a secondary flow structure such as longitudinal vortex generated on the near wall surface after excitation and the flow heat exchange rule between the pipe wall and the main flow fluid, and find the corresponding relation between the vibration excitation and the convective heat exchange intensity. The invention can improve the convection heat transfer coefficient with smaller pressure loss, and achieves the purpose of enhancing the convection heat transfer.
Drawings
FIG. 1 is a schematic structural diagram of an enhanced heat exchange experimental device based on pipe wall excitation;
FIG. 2 is a schematic structural diagram of an excitation test piece in an enhanced heat exchange experimental device based on pipe wall excitation;
reference numerals illustrate: the electric pump unit 1, the first flow regulating valve 2, the second flow regulating valve 12, the flowmeter 3, the first pressure sensor 4, the first temperature sensor 5, the high-speed photographing system 6, the excitation test piece 7, the excitation rod 8, the excitation table 9, the second temperature sensor 10, the second pressure sensor 11, the water tank 13, the stirring device 14, the drain pipe 15, the vibrating membrane 16, the vibrating membrane pressing plate 17, the main water channel 18, the observation glass 19, the heating rod 20 and the fixing support 21.
Detailed Description
The invention will be further elucidated with reference to the drawings and the examples.
As shown in fig. 1, in the reinforced heat exchange experimental system based on pipe wall excitation, a stirring device 14 is arranged in a water tank 13, a drain pipe 15 is arranged at the bottom of the water tank 13, fluid flows out from the water tank 13 and then sequentially passes through an electric pump set 1, a first flow regulating valve 2, a flowmeter 3, a first pressure sensor 4 and a first temperature sensor 5 to reach an excitation test piece 7, the excitation test piece 7 is fixed on a workbench surface of an excitation table 9, the excitation rod 8 is rigidly fixed on the excitation table 9, the upper end of the excitation rod is propped against the excitation test piece 7, a high-speed photographing system 6 is positioned above the excitation test piece 7 and rigidly fixed on the ground through a bracket, and the fluid flows out of the excitation test piece and then returns to the water tank 13 through a second temperature sensor 10, a second pressure sensor 11 and a second flow regulating valve 12.
As shown in fig. 1 and 2, the excitation test piece 7 is fixed on the working table surface of the excitation table 9 through a fixing bracket 21, an internal rectangular water channel integrally processed by the excitation test piece 7 is connected with a water inlet and a water outlet and a pipe joint at two sides, a heating rod hole is processed at the back of the cavity, a heating rod 20 is inserted in the heating rod hole, an organic observation glass 19 adhered to the water channel is arranged at the front of the cavity, a vibrating membrane 16 is arranged at the bottom of the cavity, the vibrating membrane is fixed in a groove processed on the main water channel 18 through a vibrating membrane pressing plate 17, the vibrating membrane pressing plate 17 is fixed on the wall surface of the main water channel through bolts, and the excitation rod 8 is propped against the vibrating membrane 16.
The diaphragm 16 is made of engineering flexible material or metal thin wall, has the thickness of 0.5mm, has rigidity, can deform after being excited by vibration, and has higher fatigue life.
The exciting rod 8 is a mechanical signal amplifier, is made of metal, is a solid slender rod, has a plane top, is abutted against the center of the vibrating membrane 16, has a transverse fixing rod at the bottom and is fixed on the workbench surface of the exciting table, and the exciting rod 8 transmits vibration excitation generated by the exciting table 9 to the center of the vibrating membrane 16.
The excitation test piece 7 releases fluorescent dye (such as rhodamine B) when fluid flows through, shows flow lines generated when the fluid flows, and is used for observing the fluid flow form in the fluid flow when experiments so as to carry out visual study by adopting the high-speed photographic system 6.
Application examples
As shown in fig. 1 and 2, the electric pump set 1 drives fluid during the experiment to complete the closed cycle between the water tank 13 and the excitation test piece 7, and the first flow regulating valve 2 and the second flow regulating valve 12 keep the uniform flow velocity of the fluid in the excitation test piece 7. The excitation table 9 is started to generate high-frequency low-amplitude vibration excitation, and the excitation rod 8 excites the unilateral pipe wall of the excitation test piece 7, specifically, the excitation rod 8 drives the vibration film 16 to move, so that the vibration effect of the vibration table is amplified. The secondary flow generated by the surface of the energized tube wall can be captured by the high-speed photography system 6 via the viewing glass 19. The excitation test piece 7 is fixed on the working table surface of the electric test stand by a fixing bracket 21.
To observe the effect of different pipe wall excitations on the heat exchange of the fluid, the fluid is heated by the heating rod 20 as it passes through the excitation test piece 7. Under the condition of ensuring that the flow rate and the heating temperature are equal, the influence of different excitation on heat exchange can be obtained by comparing the front-rear temperature difference of the test piece measured by the first temperature sensor 5 and the second temperature sensor 10.
In order to ensure that the temperature of the fluid at the position of entering the test piece is constant, the heat input and output of the whole system are kept balanced, the design ensures that the heated fluid is cooled in a water return pipeline, a stirring device 14 is arranged in a water tank 13, the fluid in the water tank is cooled and uniform by stirring, the stirring device is subjected to feedback regulation by a temperature sensor 5, if the temperature at the inlet of an excitation test piece 7 is increased, the stirring is accelerated, and otherwise, the stirring is slowed down.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the invention, i.e., all changes and modifications that come within the meaning and range of equivalency of the invention are to be embraced by the claims, which are not to be interpreted as illustrative.
Claims (2)
1. The reinforced heat exchange experimental system based on pipe wall excitation is characterized in that a stirring device (14) is arranged in a water tank (13), a drain pipe (15) is arranged at the bottom of the water tank (13), fluid flows out of the water tank (13) and sequentially passes through an electric pump set (1), a first flow regulating valve (2), a flowmeter (3), a first pressure sensor (4) and a first temperature sensor (5) to reach an excitation test piece (7), the excitation test piece (7) is fixed on a workbench surface of an excitation table (9), an excitation rod (8) is rigidly fixed on the excitation table (9), the upper end of the excitation rod is propped against the excitation test piece (7), a high-speed photographing system (6) is positioned above the excitation test piece (7), the fluid is rigidly fixed on the ground through a bracket, and the fluid returns to the water tank (13) through a second temperature sensor (10), a second pressure sensor (11) and a second flow regulating valve (12) after flowing out of the excitation test piece;
the vibration excitation test piece (7) is fixed on the workbench surface of the vibration excitation table (9) through a fixing bracket (21), an internal rectangular water channel is integrally processed by the vibration excitation test piece (7), water inlet and outlet ports and pipe joints are connected to two sides of the internal rectangular water channel, a heating rod hole is processed at the back of the cavity, a heating rod (20) is inserted into the heating rod hole, organic observation glass (19) adhered to the water channel is arranged at the front of the cavity, a vibrating membrane (16) is arranged at the bottom of the cavity, the vibrating membrane is fixed in a groove processed on the main water channel (18) through a vibrating membrane pressing plate (17), the vibrating membrane pressing plate (17) is fixed on the wall surface of the main water channel through bolts, and the vibration excitation rod (8) is propped against the vibrating membrane (16);
the vibrating membrane (16) is made of engineering flexible materials or metal thin walls, has the thickness of 0.5mm, has rigidity and can deform after being excited by vibration;
the vibration excitation rod (8) is a mechanical signal amplifier, is made of metal, is a solid slender rod, has a plane top, is propped against the center of the vibrating membrane (16), has a transverse fixing rod at the bottom, is fixed on the working table surface of the vibration excitation table, and transmits vibration excitation generated by the vibration excitation table (9) to the center of the vibrating membrane (16) by the vibration excitation rod (8).
2. The enhanced heat exchange assay system of claim 1, wherein said excitation assay (7) releases fluorescent dye as the fluid passes therethrough, indicating streamlines created by the fluid flow for observing the fluid flow patterns therein during the assay for visual investigation using a high-speed photographic system (6).
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| CN201811576391.6A CN109540963B (en) | 2018-12-22 | 2018-12-22 | Reinforced heat exchange experimental system based on pipe wall excitation |
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| CN201811576391.6A CN109540963B (en) | 2018-12-22 | 2018-12-22 | Reinforced heat exchange experimental system based on pipe wall excitation |
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| CN109540963A CN109540963A (en) | 2019-03-29 |
| CN109540963B true CN109540963B (en) | 2023-08-18 |
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| CN112373738B (en) * | 2020-11-23 | 2022-07-29 | 北京空间机电研究所 | Thin-wall structure vibration test device and method considering pressure difference condition |
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