Experimental investigation on the effect of vertical vibration on heat transfer performance of two phase loop thermosyphons with different diameters

Abstract

The two phase loop thermosyphon (TPLT) is generally a technique used in conjunction with a fan when cooling an electronic chip to enhance the cooling effect. In this context, the TPLT heat transfer efficiency is directly affected by the vibration caused by the associated fan. In this paper, the heat transfer performances of TPLTs with diameters of 4mm, 6mm and 8mm were experimentally investigated under a heating power capacity ranging from 40 W to 400 W, a filling ratio of 40 % to 70%, and a 30 m?s-2 35 Hz vertical reciprocating vibration. The heat transfer performance of the TPLT is compared to the case of operation under the same working conditions in a static state. The influence of the vibration state caused by the fan rotation on the heat transfer performance of TPLTs with different diameters is analyzed and discussed. The obtained results indicated that vertical vibration does not change the trend of TPLT heat transfer performance with the corresponding heating power capacity under each pipe diameter. On the other hand, it was found that the vibration enhances or inhibits the heat transfer characteristics of TPLT, affected by the pipe diameter, the heating power capacity, and the liquid filling ratio.