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首页> 外文期刊>International Journal of Heat and Mass Transfer >An experimental investigation of thermal performance of pulsating heat pipe with alcohols and surfactant solutions
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An experimental investigation of thermal performance of pulsating heat pipe with alcohols and surfactant solutions

机译：含醇和表面活性剂溶液的脉动热管热性能的实验研究

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An experimental investigation was conducted to determine the thermal performance of Pulsating Heat Pipe (PHP) with different concentrations and fill ratios (FRs) of Methanol, Ethanol and Cetyltrimethyl ammonium chloride, C_(19)H_(42)C1N (CTAC) and compared with that of Deionized (DI) water. In this study, effects of thermo-physical properties of these working fluids on progression of temperature at different regions of the PHP and thermal resistance at varying thermal loads ranging from 15 W to 80 W were investigated. The closed-loop pulsating heat pipe was bottom heated and kept at vertical position for the entire period of study. 35%, 50% and 65% FRs of DI water were used and it was observed that the thermal resistance was lowest when the PHP was filled with 50% FR. The lowest thermal resistance achieved with DI water was 0.34 K/W at higher heat load. Methanol and Ethanol have lower specific heat capacity and performed almost no better than DI water. Larger (dP/dT)_(sat) values of Methanol and Ethanol produced greater fluctuations in the flow and rapid movement of the fluid was induced within the pipe because of their relatively lower surface tension and viscosity. But these properties were not dominating factors for the thermal performance at higher heat loads. Lower specific heat capacity and latent heat of vaporization of these alcohols dominated the thermal resistance. When 50 ppm, 100 ppm, 1000 ppm and 2000 ppm of CTAC surfactant solutions were used, the experimental results showed that the heat transfer capability of the PHP is highly dependent on FR. It was observed that surface tension and viscosity are dominating factor in the performance of the PHP, when CTAC surfactant solution is used, and their degree of dominance varies with FR and heat loads. Lower surface tension of CTAC solution was advantageous for lower FR and heat load. Lower viscosity offered greater advantage at higher FR and heat load. The lowest thermal resistance achieved with surfactant solution was 0.30 K/W for 35% and 50% FR with 2000 ppm CTAC solution at higher heat load which are lower than that of DI water.
机译：为了确定脉动热管（PHP）在甲醇，乙醇和十六烷基三甲基氯化铵，C_（19）H_（42）C1N（CTAC）的不同浓度和填充比（FRs）时的热性能，进行了实验研究。去离子水。在这项研究中，研究了这些工作流体的热物理性质对PHP不同区域的温度变化以及在15 W至80 W范围内变化的热负荷下的热阻的影响。在整个研究期间，将闭环脉动热管底部加热，并保持在垂直位置。使用去离子水的35％，50％和65％FRs，并且观察到当PHP用50％FR填充时，耐热性最低。在较高的热负荷下，用去离子水获得的最低热阻为0.34 K / W。甲醇和乙醇的比热容较低，其性能几乎不比去离子水好。较大的甲醇和乙醇的（dP / dT）_（sat）值会引起较大的流量波动，并且由于其相对较低的表面张力和粘度，会在管道内引起流体的快速运动。但是，这些性能并不是较高热负荷下热性能的主要因素。这些醇的较低的比热容和汽化潜热主导了热阻。当使用50 ppm，100 ppm，1000 ppm和2000 ppm的CTAC表面活性剂溶液时，实验结果表明PHP的传热能力高度依赖于FR。观察到，当使用CTAC表面活性剂溶液时，表面张力和粘度是PHP性能的主要因素，它们的主导程度随FR和热负荷而变化。较低的CTAC溶液表面张力有利于降低FR和热负荷。较低的粘度在较高的FR和热负荷下具有更大的优势。用表面活性剂溶液获得的最低热阻，对于35％和50％FR的表面活性剂溶液，在2000 ppm CTAC溶液中，在较高的热负荷下，其热阻低于去离子水。

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