An enhanced boiling heat transfer test device and test method

Abstract

The invention discloses a strengthened boiling heat transfer testing device and a testing method. The testing device comprises a condenser, a main container, a base and a heater, wherein the condenser is communicated with the main container, and the main container is arranged on a base; the main container comprises a glass container, screw rods, an upper cover plate covered on the top end of the glass container and a lower cover plate covered on the bottom end of the glass container, wherein the upper and lower cover plates respectively have through holes, the screw rods pass through the through holes of the upper and lower cover plates and are fixed with the upper and lower cover plates; the base comprises a ceramic base arranged in the base; the heater comprises a main heater and an auxiliary heater, the main heater is positioned on the middle position of the base, arranged on the ceramic base and is fixed with the through hole of the lower cover plate; the auxiliary heater is positioned in the main container and is arranged on the lower cover plate. The testing device and the testing method provided by the invention have the advantages that a sample is flexible to replace, the operation is convenient, the boiling state under high heat flux density is measured, testing effects in boiling under different structures are compared, and the test result is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of boiling heat transfer, in particular to an enhanced boiling heat transfer test device and a test method. Background technique [0002] There has been no systematic and clear test method in the literature on boiling test, so the test error is relatively large. [0003] First of all, the problem of sealing, how to ensure the sealing of the boiling vessel is a problem. The traditional method is to apply sealant on the inner wall of the vessel. Water leaks frequently. [0004] Secondly, in terms of sample replacement, if samples with different parameters are constantly replaced for each test, how can heat conduction test workpieces be used for boiling sample tests? Ordinary heat conduction is conducted through silicone grease, and the heat loss is large, but for sample positioning and whether Strong bonding to the heat source remains an issue. [0005] In terms of test methods, the general test error is re...

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Problems solved by technology

[0003] First of all, the problem of sealing, how to ensure the sealing of the boiling vessel is a problem. The traditional method is to apply sealant on the inner wall of the vessel. Leakage often

[0004] Secondly, in terms of sample replacement, if samples with different parameters are constantly replaced for each test, how can heat conduction test workpieces be used for boiling sample tests? Ordinary heat conduction is conducted through silicone grease, and the heat loss is large, but for sample positioning and whether Strong bonding to heat source is still a problem

[0005] In terms of test methods, the general test error is relatively large, mainly due to the poor insulation effect of the heat transfer device, which inevitably leads to heat loss. The method of obtaining heat flow by subtracting heat loss from the total heat is more complicated to process data and it is difficult to verify its accuracy.

And the installation of thermocouples in traditional devices is troublesome

[0006] Boiling heat transfer has the potential to transfer high heat flow, but it still cannot meet the requirements for smooth surfaces, so it is necessary to study new surface structures to improve boiling enhancement

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