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首页> 外文期刊>Science and Technology for the Built Environment >Experimental and numerical investigation on irregular spacing of the ribs in the entry length of a solar air heater channel
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Experimental and numerical investigation on irregular spacing of the ribs in the entry length of a solar air heater channel

机译：太阳能空气加热器通道进入长度肋骨不规则间距的实验和数值研究

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An experimental test rig is utilized to measure the effects of the flow configuration and particularly the rib geometry, on the thermal performances of solar air heaters. Since the heat transfer rate within the entry length is relatively high, the implementation of the ribs needs to be justified. Computational fluid dynamics simulations are also conducted to support the experiments and to provide detailed visualization of the flow field. The experimental data approves that the numerical simulation can estimate the heat transfer and pressure drop with reasonable accuracy. It appears from the results that achieving a particular spacing between the first ribs within the entry length, greater than the normal spacing in the fully developed region, yields a better performance. It is shown that in relatively short channels where the ratio of channel length to hydraulic diameter is small, the application of wider spacing in the entry length results in almost the same heat transfer rates, while it benefits from a much smaller pressure drop. In a presented case study, the application of irregular spacing improves the thermal performance of a flat plate solar collector by 11% compared to the collectors having ribs with regular spacing.
机译：实验试验台用于测量流动配置和肋骨几何形状的效果，在太阳能空气加热器的热性能上。由于进入长度内的传热速率相对较高，因此肋骨的实施需要是合理的。还进行计算流体动力学模拟以支持实验并提供流场的详细可视化。实验数据批准，数值模拟可以以合理的准确度估计传热和压力下降。从结果中出现在进入长度内的第一肋之间的特定间隔，大于完全发达区域中的正常间距，产生更好的性能。结果表明，在通道长度与液压直径的比率小的相对短的通道中，在进入长度中施加更宽的间距导致几乎相同的传热速率，而它受益于更小的压降。在呈现的案例研究中，与具有规则间距的肋条的收集器相比，不规则间距的应用提高了平板太阳能电池的热性能11％。

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