A method of fast quality control inspection of loop heat pipe

The dynamic behaviour of loop heat pipe (LHP) changes with heat load and physical properties of LHP such as fluid charging, wick material, and tolerance in manufacture. The start-up phenomena of a LHP can be classified into four modes, according to the heat load Q in : failure mode, oscillating mode...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-04, Vol.1139 (1), p.12004
Main Authors: Huang, Bin-Juine, Huang, H H, Liang, T L, Yang, P E, Hu, S S
Format: Article
Language:English
Subjects:
Evaporators
Failure modes
Heat
Heat pipes
Heating load
Inspection
Loop heat pipes
Luminaires
Mass production
Physical properties
Quality control
Transient performance
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Summary:The dynamic behaviour of loop heat pipe (LHP) changes with heat load and physical properties of LHP such as fluid charging, wick material, and tolerance in manufacture. The start-up phenomena of a LHP can be classified into four modes, according to the heat load Q in : failure mode, oscillating mode, overshoot mode, and normal mode. It is found that the operation mode is related to the rate of temperature rise in evaporator during initial transient performance using a step heating load. The abnormal high rate of temperature rise can be observed for LHP with failure, oscillating or overshoot mode performance. Based on this phenomenon, the normal-mode performance of LHP can be assured from a short transient test in about 80s using a step heat load, instead of using steady-state test (taking 1,800s). This transient test method has been applied in the quality inspection of commercial loop heat pipe in mass production. No LHP failure was found for more than 10 years for about 30,000 sets of street LED luminaires designed with LHP.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1139/1/012004