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The influence of surface heating on the flow dynamics within a transpired air collector

机译:表面加热对蒸发空气收集器内流动动力学的影响

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An experimental study was conducted to examine the air flow behavior in the channel of a transpired air collector under different heating conditions. Velocity fields were measured using Particle Image Veloci-metry (PIV). Mean velocities and turbulent properties were computed and evaluated. Results show that at high flow rates, the flow was dominated by forced convection while at the lowest flow rate the flow was primarily buoyancy driven, where buoyancy-induced stabilities and heating effects were strongest. It was observed that the buoyancy-induced instabilities enhanced the magnitude and modified the structure of mean and turbulent properties as compared to the unheated flow. The flow rate influenced the relative magnitudes of the normalized mean and turbulent velocities that were enhanced with a decrease in the flow rate at a given heating condition. Collector efficiencies up to 70% were observed, which could be attributed to the corrugation surface geometry that enhanced turbulence and provided a larger heat transfer surface area.
机译:进行了一项实验研究,以研究在不同加热条件下蒸发空气收集器通道中的空气流动行为。使用粒子图像测速仪(PIV)测量速度场。计算并评估了平均速度和湍流特性。结果表明,在高流速下,气流主要由强制对流控制,而在最低流速下,气流主要由浮力驱动,其中,由浮力引起的稳定性和热效应最强。观察到,与未加热的流相比,浮力引起的不稳定性增加了幅度,并且改变了均值和湍流特性的结构。流速影响归一化平均速度和湍流速度的相对大小,在给定的加热条件下,流速的降低会增强流速的相对大小。观察到集热效率高达70%,这可以归因于波纹表面的几何形状,该几何形状增强了湍流并提供了更大的传热表面积。

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