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Investigation of the Effect of Using Tube Inserts for the Intensification of Heat Transfer

机译：使用管插件增强传热效果的研究

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摘要

In this work, heat transfer in channels containing inserts of different shapes was investigated using computational fluid dynamics (CFD) modeling techniques taking a gaslight water heater as an example. Three types of devices inserted in the water heater tube (flow swirlers) were investigated: star-shaped, coiled wire, and classic ones in the form of twisted tapes. In the present study, the RNG k-ε turbulence model is used to model the turbulent flow regime. This numerical simulation has been performed over a Reynolds number range of 5800-18500. In the studied range of Reynolds number the maximum thermal performance factor was obtained by the starry inserts with A_(star)/A_(inlet) = 0.50. The results have exposed that also the use of all tube inserts leads to a considerable increase in heat transfer and pressure drop over the smooth tube. In addition, the results revealed that both heat transfer rate and friction factor in the tube equipped with starry insert were significantly higher than those in the tube fitted with the coiled wire inserts and classic twisted tape.
机译：在这项工作中，以计算气体动力学（CFD）建模技术为研究对象，以包含燃气灶的燃气热水器为例，研究了包含不同形状的插入物的通道中的热传递。研究了插入热水器管中的三种类型的设备（旋流器）：星形，盘绕线和扭曲带状的经典设备。在本研究中，使用RNGk-ε湍流模型来模拟湍流状态。在5800-18500的雷诺数范围内执行了此数值模拟。在研究的雷诺数范围内，最大的热性能系数是通过星型镶件获得的，其中A_（星）/ A_（入口）= 0.50。结果表明，所有管插入件的使用也导致光滑管上的传热和压降显着增加。此外，结果表明，装有星状插入件的管中的传热速率和摩擦系数均显着高于装有盘绕钢丝插入物和经典双绞带的管中的传热速率和摩擦系数。

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