Heat transfer by high‐frequency oscillations: A new hydrodynamic technique for achieving large effective thermal conductivities
Heat transfer by high‐frequency oscillations: A new hydrodynamic technique for achieving large effective thermal conductivities
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高频振荡传热：一种实现大有效热导率的新流体动力学技术
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
Ling Zhao
中科院分区：
文献类型：
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作者：
U. Kurzweg;Ling Zhao
当毛细管内的流体发生轴向振荡时，研究了保持在不同温度下并通过毛细管束相互连接的两个流体储存库之间的热传递。非常大的有效轴向导热率是可以实现的，比热管的有效导热率高出几个数量级。发展了层流流体力学理论来描述这一现象，并表明强化导热是一种涉及到在这些流动中存在的超薄Stokes边界层径向传热的强化导热。以水为工质的实验测量表明，有效热扩散率高达17 ，是无振荡时的900倍。由于该过程不涉及净对流质量传输，因此它作为一种快速从放射性液体中排出热量的方法提供了相当大的前景。
Heat transfer between two fluid reservoirs maintained at different temperatures and connected to each other via a capillary bundle is examined when the fluid within the capillaries is oscillated axially. Very large effective axial heat conduction rates, exceeding those possible with heat pipes by several orders of magnitude, are found to be achievable. A laminar hydrodynamic theory is developed to describe the phenomenon and to show that the enhanced heat conduction is one involving radial heat transfer across very thin Stokes’s boundary layers existing in these flows. Experimental measurements using water as the working fluid show effective thermal diffusivities up to 17 900 times those existing in the absence of oscillations. Since the process involves no net convective mass transport, it offers considerable promise as a means for the rapid removal of heat from radioactive fluids.