Qu J., Wang Q., Experimental study on the thermal performance of vertical closed-loop oscillating heat pipes and correlation modeling. Renewable and Sustainable Energy Reviews, 2018, 91: 630–638. Nazari M.A., Ahmadi M.H., Ghasempour R., et al., How to improve the thermal performance of pulsating heat pipes: A review on working fluid. Renewable and Sustainable Energy Reviews, 2021, 144: 110995. Xu Y., Xue Y., Qi H., et al., An updated review on working fluids, operation mechanisms and applications of pulsating heat pipes. Energy for Sustainable Development, 2023, 72: 230–242. Nazari M.A., Rungamornrat J., Prokop L., et al., An updated review on integration of solar photovoltaic modules and heat pumps towards decarbonization of buildings. Nazari M.A., Ahmadi M.H., Ghasempour R., et al., A review on pulsating heat pipes: from solar to cryogenic applications. Beijing University of Civil Engineering and Architecture, Beijing, China, 2020. Zhao Y., Influence of cooling conditions on the heat transfer performance of pulsating heat pipe and its application in solar energy collecting. Lv L., Li J., Zhou G., A robust pulsating heat pipe cooler for integrated high power LED chips. 4921041.ĭang C., Jia L., Lu Q., Investigation on thermal design of a rack with the pulsating heat pipe for cooling CPUs. At the heating power above 270 W, the thermal resistance with MEPCM suspension at 1.0% of the mass concentration is lower than that at 0.5%.Īkachi H., Structure of a heat pipe. The thermal resistance of MEPCM suspension tends to be similar for heating power of 230–250 W. When the inclination angles is 60°, the thermal resistance with MEPCM suspension at 0.5% of the mass concentration is lower than that at 1.0% at the heating power below 230 W. Due to the high viscosity of MEPCM suspension, the PHP with ultra-pure water has the lowest heat transfer resistance. When the inclination angles are 60° and 30°, the effect of gravity on the flow direction is reduced to 86.6% and 50% of that on the inclination angle of 90°, respectively, and the promoting effect of gravity on the working fluid is further weakened as the inclination angle further decreases. When the inclination angle is 90°, the PHP with MEPCM suspension at 1.0% of mass concentration has the lowest thermal transfer resistance and followed by ultra-pure water and MEPCM suspension at 0.5% of mass concentration has the highest thermal transfer resistance. The unfavorable effect of the inclination angle decreases with heating power increasing. The heat transfer characteristic of the PHP is positively correlated with the inclination angle and the 90° is optimum. At the inclination angle of 90°, the temperature at heating side decreases compared to ultra-pure water and the temperature at heating side decreases with the raising of MEPCM suspension mass concentration. It was found that when the PHP uses MEPCM suspension as its working fluid, operating stability is impoverished under lower heating power and the operating stability is better under higher heating power. The heat transfer characteristic with MEPCM suspension of different mass concentrations (0.5% and 1.0%) and ultra-pure water were compared experimentally. Due to the relatively large specific heat capacity of micro encapsulated phase change material (MEPCM) suspension, a heat transfer performance experimental facility of the PHP was established. The specific heat capacity of working fluid is an important influence factor on heat transfer characteristic of the pulsating heat pipe (PHP).
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