%0 Journal Article %A Abiko, Kazusa %A Murata, Akira %A Saito, Hiroshi %A Iwamoto, Kaoru %D 2018 %I Begell House %K heat pipe, heat transport device, phase change, gas–liquid two-phase flow, image analysis, flow visualization %N 2 %P 47-64 %R 10.1615/JFlowVisImageProc.2018021253 %T IMAGE ANALYSIS OF INTERNAL FLOW IN GROOVED-CHANNEL HEAT TRANSPORT DEVICE WITH PHASE CHANGE %U https://www.dl.begellhouse.com/journals/52b74bd3689ab10b,5c9d79f90a7edd5c,36ee5dfc265f4706.html %V 25 %X Recent advancement in the design of electronic devices necessitates effective cooling methods due to their high performance, small size, and high-density packaging. As compared with conventional heat pipes, Oscillating Heat Pipe (OHP) and Parallel-Tube Heat transport device (PTH) show higher heat-transport efficiency because of spontaneous internal flow convecting both sensible and latent heats. OHP consists of a meandering tube, whereas PTH consists of multiple tubes and two headers. When a certain level of temperature difference is applied between both ends, self-oscillating flow of liquid and vapor with phase change occurs in the OHP/PTH. So far many studies have been performed for OHP and some for PTH. However, the relation between the two-phase internal flow pattern and heat transport rate has not been quantitatively clarified as yet. In this study, in order to highlight the difference between OHP and PTH, simultaneous measurements of heat transport rate and internal flow pattern were performed for them with two working fluids (ethanol and FC-72). In the present results, when the heat transport rate was increased, the amplitude of the oscillating flow was increased so as for the internal flow from the bottom heating section to reach the top cooling section. At the highest heat transport rate, unidirectional flow component with some oscillating flow resulted in fixed upward/downward flows in each straight section except for the case of PTH with ethanol. The higher degree of freedom forthe internal flow caused by the headers of PTH resulted in the higher performance in PTH than in OHP. %8 2018-08-07