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Heat Pipe with High Heat Transfer Rate by Reciprocating Motion (Examination of Application to Automotive Engine Piston)

Article of Honda R&D Technical Review Vol.33 No.1

Summary

The flow of gas and liquid in heat pipes is generally impaired by factors such as oscillation and inclination, with the result that the heat transfer becomes excessively low. For this reason, there are no known cases of heat pipe use in cars and motorcycles, etc.
The authors, therefore, proposed a new heat pipe that controls the two-phase flow of gas and liquid without reducing the amount of heat transport, by reducing the friction energy loss inside the pipe and forcibly inducing self-oscillation.
Measurement results in the condition with oscillation applied by reciprocating motion showed an increase in the heat transfer coefficient by a factor of 1.6 compared with that at standstill. That mechanism is thought to be as follows. In the initial stage, the liquid sealed in the heat pipe is broken up into fine droplets by reciprocation. The droplets then acquire drive force in a constant direction macroscopically while contacting the gates, producing a unidirectional flow. Further, a loop flow channel enables transfer of gas and liquid from condensed areas to evaporation areas without gas-liquid collision.
This study performed thermal analysis of the case when applied to an engine piston. The results showed that the temperature at the piston head center was reduced by 39 K and DT was also reduced from 140 K to 75 K, and thus thermal stress reduction effects can be anticipated.

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Author (organization or company)

Kenji MATSUMOTO(Innovative Research Excellence Power Unit & Energy)

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