Numerical analysis on the heat and work transfer due to shear in a hot cascade Ranque–Hilsch vortex tube
Numerical analysis on the heat and work transfer due to shear in a hot cascade Ranque–Hilsch vortex tube
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DOI：
10.1016/j.ijrefrig.2016.04.021
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Nilotpala Bej;K. Sinhamahapatra
中科院分区：
文献类型：
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作者：
Nilotpala Bej;K. Sinhamahapatra
涡管级联是一种可能的实现方式，以提取显著更大量的有用的工作。热级联型RHVT利用冷气体用于冷却目的，同时提高热气体的加热能力。在涡流管中，流入压力是转换成热能的唯一能量来源。压力能到热能的转换与由于沿着径向、轴向和切向方向的剪切而引起的热量和功的传递相关联。本文基于沿着所有三个方向的剪切引起的热量和功传递，研究了流体流动和热分离的物理过程。切向剪切作用所产生的功总是从冷流体层向热流体层传递，是热分离过程中最主要的因素。热级联的贡献大大增加。然而，由于显热传递的影响，热分离过程劣化。
Cascading of vortex tubes is a possible implementation to extract significantly larger amount of useful work. A hot cascade-type RHVT makes use of the cold gas for cooling purposes while improving the heating capacity of the hot gas. In a vortex tube inflow pressure is the only source of energy which converts into thermal energy. The conversion of pressure energy into thermal energy is associated with the heat and work transfer due to shear along the radial, axial and tangential directions. In this paper, the physics of fluid flow and thermal separation are studied based on the heat and work transfer due to shear along all three directions. The work transfer due to the action of tangential shear is always from the cold to hot fluid layers and is the most dominant factor in the thermal separation process. The contribution increases considerably with hot cascading. However, the process of thermal separation degrades due to the effect of sensible heat transfer.