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首页> 外文期刊>Journal of Heat Transfer >Impact of Mixed Convective and Radiative Heat Transfer in Spiral-Coiled Tubes
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Impact of Mixed Convective and Radiative Heat Transfer in Spiral-Coiled Tubes

机译：螺旋管内对流和辐射混合传热的影响

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摘要

Spiral-coiled tube heat exchangers (SCTHE) have higher heat transfer as compared to the conventional heat transfer devices and are extensively used to extract heat from exhaust gases in the chemical processing industries and also from sunlight for domestic applications. However, no attention has been made to predict heat transfer characteristics considering combined convective and radiative heat transfer in spiral-coiled tubes. In the present study, numerical analysis has been performed to predict fluid flow and heat transfer characteristics by combined forced convection and thermal radiation in spiral-coiled tubes. The P-1 radiation and the renormalized group (RNG) kappa-epsilon turbulence models have been used to study the effect of thermal radiation and turbulent convection heat transfer in the spiral-coiled tube, respectively, over a wide range of Reynolds numbers (10,000-100,000) and curvature ratios (0.02-0.05). The emissivity and optical thickness have been varied from 0.0 to 1.0 and 0.0 to 8.0, respectively, to investigate the effect of thermal radiation on heat transfer characteristics in spiral-coiled tubes. For the considered Reynolds number range, it is found that the heat transfer is enhanced by approximately 10% when radiation is taken into account. It is found that the heat capacity increased with an increase in optical thickness and wall emissivity. Further, the effect of optical thickness on fully developed flow is observed weak and the average heat transfer coefficient is influenced by the wall emissivity over the entire flow.
机译：与传统的传热装置相比，螺旋盘管式换热器（SCTHE）具有更高的传热能力，并广泛用于从化学加工行业的废气以及家庭应用的日光中提取热量。然而，在螺旋盘管中考虑对流和辐射的热传递相结合时，没有注意预测热传递特性。在本研究中，已经进行了数值分析，以通过螺旋盘管中的强制对流和热辐射相结合来预测流体流动和传热特性。已使用P-1辐射和重归一化组（RNG）κ-ε湍流模型分别研究了大范围雷诺数（10,000）下螺旋管中的热辐射和湍流对流传热的影响-100,000）和曲率比（0.02-0.05）。发射率和光学厚度分别从0.0到1.0和0.0到8.0变化，以研究热辐射对螺旋管中传热特性的影响。对于所考虑的雷诺数范围，发现当考虑辐射时，传热提高了约10％。发现随着光学厚度和壁发射率的增加，热容量增加。此外，观察到光学厚度对充分发展的流动的影响较弱，并且平均传热系数受整个流动中壁发射率的影响。

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