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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation on startup and thermal performance of a high temperature special-shaped heat pipe coupling the flat plate heat pipe and cylindrical heat pipes
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Experimental investigation on startup and thermal performance of a high temperature special-shaped heat pipe coupling the flat plate heat pipe and cylindrical heat pipes

机译：平板热管与圆柱热管结合的高温异形热管启动及热性能的实验研究

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摘要

A high temperature special-shaped heat pipe (HTSSHP) coupling the flat plate heat pipe (FHP) and cylindrical heat pipes (CHPs), respectively as the thermal receiver and heat transfer unit, is proposed as the key component in a solar thermochemical reactor. The startup characteristics, isothermal performance, and thermal resistance variation of HTSSHP were experimentally investigated and analyzed. The results show that heat transfer limits are not encountered in tests and HTSSHP can startup effectively. The continuum flow transition temperature of sodium vapor in FHP and CHPs are 426.0 degrees C and 442.3 degrees C respectively and the startup behavior of HTSSHP differs from the flat-front phenomenon in a traditional high temperature cylindrical heat pipe with a constant transition temperature each part. However, the temperature difference response in startup can be employed to indentify the sodium melting and the flow regime transition in FHP and CHPs, validating its startup law. HTSSHP possesses the potential to inhibit the hotspots on heat absorber surface and meanwhile improve the temperature distribution in reaction chamber. The overall thermal resistance in HTSSHP reduces with increasing operating temperature, ranging from 0.12 to 0.19 degrees C/W that is in the same order of magnitude in a typical heat pipe. Furthermore, the various heat inputs and cooling rates have considerable effect on the thermal resistance in cooling side. This work is helpful for establishing the preliminary understanding of the operating characteristics on HTSSHP and provides some suggests for its normal operation and structure optimization. (C) 2016 Published by Elsevier Inc.
机译：提出了将平板热管（FHP）和圆柱热管（CHP）分别作为热接收器和传热单元的高温异形热管（HTSSHP），作为太阳能热化学反应器的关键部件。对HTSSHP的启动特性，等温性能和热阻变化进行了实验研究和分析。结果表明，在测试中没有遇到传热限制，HTSSHP可以有效启动。 FHP和CHP中钠蒸气的连续流动转变温度分别为426.0摄氏度和442.3摄氏度，并且HTSSHP的启动行为不同于传统的高温圆柱形热管中每个部分均具有恒定转变温度的平坦现象。但是，启动时的温差响应可用于确定FHP和CHP中的钠熔化和流态转变，从而验证其启动规律。 HTSSHP有潜力抑制吸热器表面的热点，同时改善反应室内的温度分布。 HTSSHP中的总热阻会随着工作温度的升高而降低，工作温度范围从0.12到0.19℃/ W，在典型的热管中处于相同的数量级。此外，各种热量输入和冷却速率对冷却侧的热阻具有相当大的影响。这项工作有助于建立对HTSSHP操作特性的初步了解，并为其正常操作和结构优化提供一些建议。 （C）2016由Elsevier Inc.发布

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