The effect of condenser temperature on the performance of the evaporator in a wickless heat pipe performance
The effect of condenser temperature on the performance of the evaporator in a wickless heat pipe performance
复制标题
无芯热管中冷凝器温度对蒸发器性能的影响
DOI：
10.1016/j.ijheatmasstransfer.2021.121484
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发表时间：
2021
影响因子：
5.2
通讯作者：
Sicker, Ronald J.
中科院分区：
文献类型：
--
作者：
Yu, Jiaheng;Nguyen, Thao T.T.;Pawar, Anisha;Wayner, Peter C.;Plawsky, Joel L.;Chao, David F.;Sicker, Ronald J.
摘要在国际空间站（ISS）的微重力环境下，研究了约束汽泡（CVB），这是一种简单的无芯热管设计，依靠界面力驱动方形试管中的角流。本文以戊烷为工质，研究了不同冷凝器温度对传热和流体流动特性的影响。随着冷凝器温度的降低，系统性能下降。使用纯工质时，这种性能下降与使用94%体积的戊烷和6%体积的异己烷的混合物时观察到的情况相反。当冷凝器温度降低时，性能下降的机制是系统加热器端Marangoni流的表观强度比预期的要大。用一个简单的数学模型拟合了实验数据，并对保持冷凝器温度不变同时增加加热器功率和保持加热器功率不变同时降低冷凝器温度的实验进行了蒸发器换热系数的提取。所有的结果都可以归结为一条努塞尔数与马兰戈尼数的曲线。在该公式中，努塞尔数随着马兰戈尼数的1/3次方的增加而减小。
The Constrained Vapor Bubble (CVB), a simple, wickless, heat pipe design that depends on interfacial forces to drive corner flow in a square cuvette, was studied in the microgravity environment aboard the International Space Station (ISS). In this paper, we consider the effects of different condenser temperatures on the heat transfer and fluid flow behavior using pentane as the working fluid. As the condenser temperature was decreased, the performance of the system decreased. This performance decrease using the pure working fluid was opposite to the behavior observed when using a mixture of 94 vol% pentane and 6 vol% isohexane. The mechanism for the decline in performance as the condenser temperature was lowered was a stronger than expected increase in the apparent strength of Marangoni flows at the heater end of the system. A simple mathematical model was fit to the experimental data and used to extract an evaporator heat transfer coefficient for experiments where we held the condenser temperature constant while increasing the heater power and where we held the heater power constant while decreasing the condenser temperature. All the results could be collapsed onto a single Nusselt number vs. Marangoni number curve. In this formulation, the Nusselt number was found to decrease with increasing Marangoni number to the 1/3 power.
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影响因子：
2.1
作者：
Bowman, WJ;Maynes, D
通讯作者：
Maynes, D
影响因子：
8.6
作者：
Kundan, Akshay;Plawsky, Joel L.;Zoldak, John
通讯作者：
Zoldak, John
浮力对流和热毛细管对流的耦合和分离
影响因子：
1.8
作者：
D. Schwabe;J. Metzger
通讯作者：
J. Metzger
DOI：
10.1016/j.ijmultiphaseflow.2016.02.001
发表时间：
2016-06-01
影响因子：
3.8
作者：
Kundan, Akshay;Nguyen, Thao T. T.;Sicker, Ronald J.
通讯作者：
Sicker, Ronald J.
DOI：
10.1016/j.ijheatmasstransfer.2014.07.044
发表时间：
2014-11-01
影响因子：
5.2
作者：
Kundan, Akshay;Plawsky, Joel L.;Wayner, Peter C., Jr.
通讯作者：
Wayner, Peter C., Jr.