TWO-PHASE FLOW PATTERNS OF A TOP HEAT MODE CLOSED LOOP OSCILLATING HEAT PIPE \\WITH CHECK VALVES (THMCLOHP/CV)
S. Thongdaeng, B. Bubphachot, S. Rittidech
Heat Pipe and Thermal Tools Design Research Unit (HTDR), Faculty of Engineering, Mahasarakham University, Mahasarakham, 44150, Thailand
Keywords: режим двухфазного течения, замкнутая тепловая трубка, осциллирующий поток, режим нагрева сверху, two-phase flow pattern, closed loop oscillating heat pipe, top heat mode
Abstract
This research is aimed at studying the two-phase flow pattern of a top heat mode closed loop oscillating heat pipe with check valves. The working fluids used are ethanol and R141b and R11 coolants with a filling ratio of 50% of the total volume. It is found that the maximum heat flux occurs for the R11 coolant used as the working fluid in the case with the inner diameter of 1.8 mm, inclination angle of -90 ͦ, evaporator temperature of 125gr, and evaporator length of 50 mm. The internal flow patterns are found to be slug flow/disperse bubble flow/annular flow, slug flow/disperse bubble flow/churn flow, slug flow/bubble flow/annular flow, slug flow/disperse bubble flow, bubble flow/annular flow, and slug flow/annular flow.
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