Effect analysis on thermohydraulic characteristics of microchannel direct liquid cooling under swing condition.

• Thermohydraulic characteristics of microchannel direct liquid cooling were studied. • The influence of axial thermal conduction was considered. • The influence factors of wall temperature uniformity were analyzed. • Effect of swing on thermohydraulic characteristics of microchannels was studied. • Performance factor was defined to evaluate microchannel comprehensive performance. In this paper, the thermohydraulic characteristics of direct liquid cooling in rectangular microchannels were studied under swing condition. Deionized water was used as the coolant. The effects of coolant flow rate, coolant inlet temperature, microchannel equivalent diameter and heating power on the thermohydraulic performances were studied. In addition, the wall temperature uniformity and axial heat conduction effect were discussed. Furthermore, the influence of swing speed on the performances of microchannel direct liquid cooling was studied. The performance factor was defined to evaluate the microchannel comprehensive thermohydraulic performance. The results show that the transition Reynolds number of microchannels with equivalent diameters of 0.9–1.6 mm is between 500 and 2000. The wall temperature uniformity is improved with the increase of coolant flow and the decrease of coolant inlet temperature. The axial heat conduction demonstrates a great influence on the microchannels, which accounts for about 40%-50% to the total heat. With the increase of swing speed, the drag coefficient decreases slowly within 4%. Meanwhile, the flow rate should be in 0.14–0.2 L/min to obtain an optimal effect of the performance factor. [ABSTRACT FROM AUTHOR]