Effect Study of Flow Boundary Layer Characteristics in Narrow Rectangular Channel by Longitudinal Vortex
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摘要: 利用纵向涡发生器(LVG)产生纵向涡(LV)强化传热的机理主要是基于对边界层的削薄和破坏。由于LV作用距离远,结构简单,安装高度低,对于具有窄间隙通道的换热结构,LV强化传热有着较强的应用价值。本文应用相位多普勒粒径分析仪对LV作用下的窄间隙矩形通道内速度场分布进行了测量。实验结果表明,LV可以有效地削薄和破坏流动边界层厚度;LV对边界层的削薄和破坏可以对传热起到强化的作用;CFD数值模拟结果表明,剪切应力模型(SST)以对LV作用下窄间隙矩形通道内的速度场进行有效地模拟。Abstract: Longitudinal Vortex (LV) is produced by Longitudinal Vortex Generators (LVG). The heat transfer enhancement mechanism of LV is based on the reducing and damaging of flow boundary layer. With relative long influence distance and simple structure,the LVGs can be used in narrow channels with flat surface. In this paper,Phase Doppler Particle Analyzer has be used to measure the flow field in narrow rectangular channel with LV. The experimental data of smooth and LVGs channels showed that the boundary layer is damaged by LV in single-phase water flow,and the calculation results of CFD showed that the velocity field with LV can be simulated by SST model in narrow rectangular channel.
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