Possibility of long-distance heat transport in weightlessness using supercritical fluids
Possibility of long-distance heat transport in weightlessness using supercritical fluids
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DOI：
10.1103/physreve.82.061126
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发表时间：
2010-12-21
影响因子：
2.4
通讯作者：
Garrabos, Y.
中科院分区：
文献类型：
--
作者：
Beysens, D.;Chatain, D.;Garrabos, Y.
在大距离上的热传输经典地用重力或毛细作用驱动的热管来执行。我们在这里调查是否“活塞效应”，一个热化过程，是非常有效的失重可压缩流体，也可以用来执行长距离传热。实验是在一个模拟热管（16.5毫米长，3毫米内径封闭的圆柱体），近绝热聚甲基丙烯酸甲酯壁和两个铜基板。在气液临界点（临界温度：33 K）附近用H-2填充电池。失重是通过使流体受到补偿重力的磁力来实现的。最初，流体是等温的。然后，热量被传送到其中一个具有电阻的底座。在另一端测量流体传递的瞬时热量。对数据进行分析并与二维数值模拟进行比较，该二维数值模拟允许对其他流体进行外推（例如，CO2，临界温度为300 K）。主要的结果是关注在早期的一个非常快的响应的存在，仅限于由电池材料的热性能。就比率而言，注入或输送的热功率的产率不超过10- 30%，并且受管道热容量的限制。这些结果在临界温度附近的一个大的温度域是有效的。
Heat transport over large distances is classically performed with gravity or capillarity driven heat pipes. We investigate here whether the "piston effect," a thermalization process that is very efficient in weightlessness in compressible fluids, could also be used to perform long-distance heat transfer. Experiments are performed in a modeling heat pipe (16.5 mm long, 3 mm inner diameter closed cylinder), with nearly adiabatic polymethylmethacrylate walls and two copper base plates. The cell is filled with H-2 near its gas-liquid critical point (critical temperature: 33 K). Weightlessness is achieved by submitting the fluid to a magnetic force that compensates gravity. Initially the fluid is isothermal. Then heat is sent to one of the bases with an electrical resistance. The instantaneous amount of heat transported by the fluid is measured at the other end. The data are analyzed and compared with a two-dimensional numerical simulation that allows an extrapolation to be made to other fluids (e.g., CO2, with critical temperature of 300 K). The major result is concerned with the existence of a very fast response at early times that is only limited by the thermal properties of the cell materials. The yield in terms of ratio, injected or transported heat power, does not exceed 10-30 % and is limited by the heat capacity of the pipe. These results are valid in a large temperature domain around the critical temperature.