Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 12, 2019 - October 13, 2019
To enhance the performance of thermosiphon, boiling heat transfer under low pressure is examined experimentally. We focus on the size effect of heat transfer surface. Thus, four kinds of pyramid type heat transfer surface and six kinds of dimple type heat transfer surface with size of 25mm×25mm are used in this experiment. Optimal size of pyramid surface is pitch of 2.5mm. This is the same result with 10mm×10mm surface. Therefore, there is no size effect for optimal pyramid type except degree of heat transfer enhancement. On the other hand, optimal diameter of dimple surface is 2.0mm~3.0mm. And, dimple surface shows higher performance with narrower pitch. Performance of pyramid 2.5mm type is higher by about 1.78 times compared with that of dimple pitch 4.0mm type at the heat flux of 100kW/m2.
