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首页> 外文期刊>International Journal of Thermal Sciences >Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models
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Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models

机译：间隔型通道中的湍流热传递：实验和计算研究和湍流模型的选择

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摘要

Heat transfer in spacer-filled channels of the kind used in Membrane Distillation was studied in the Reynolds number range 100-2000, encompassing both steady laminar and early-turbulent flow conditions. Experimental data, including distributions of the local heat transfer coefficient h, were obtained by Liquid Crystal Thermography and Digital Image Processing. Alternative turbulence models, both of first order (k-epsilon, RNG k-epsilon, BSL k-omega, SST k-omega) and of second order (LRR RS, SSG RS, omega RS, BSL RS), were tested for their ability to predict measured distributions and mean values of h. The best agreement with the experimental results was provided by first-order omega-based models able to resolve the viscous/conductive sublayer, while all other models, and particularly epsilon-based models using wall functions, yielded disappointing predictions.
机译：在雷诺数100-2000中，研究了膜蒸馏中使用的那种使用的间隔物填充通道的热传递，包括稳定的层层和早期湍流条件。 通过液晶热成像和数字图像处理获得了实验数据，包括局部传热系数H的分布。 替代湍流模型，一级（K-EPSILON，RNG K-EPSILON，BSL K-OMEGA，SST K-OMEGA）和二阶（LRR RS，SSG RS，OMEGA RS，BSL RS）进行了测试 能够预测测量分布和H的平均值。 与实验结果的最佳协议是由能够解决粘性/导电子层的一阶Omega的模型提供，而所有其他型号，特别是使用墙壁功能的基于epsilon的模型，产生了令人失望的预测。

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