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首页> 外文期刊>International Journal of Heat and Mass Transfer >A CFD based thermo-hydraulic performance analysis of an artificially roughened solar air heater having equilateral triangular sectioned rib roughness on the absorber plate
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A CFD based thermo-hydraulic performance analysis of an artificially roughened solar air heater having equilateral triangular sectioned rib roughness on the absorber plate

机译：基于CFD的人工粗化太阳能空气加热器的热工液压性能分析，该加热器在吸收板上具有等边三角形截面的肋条粗糙度

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摘要

In this article, a numerical investigation is conducted to analyze the two-dimensional incompressible Navier-Stokes flows through the artificially roughened solar air heater for relevant Reynolds number ranges from 3800 to 18,000. Twelve different configurations of equilateral triangular sectioned rib (P/e = 7.14-35.71 and e/d = 0.021-0.042) have been used as roughness element. The governing equations are solved with a finite-volume-based numerical method. The commercial finite-volume based CFD code ANSYS FLUENT is used to simulate turbulent airflow through artificially roughened solar air heater. The RNG κ-ε turbulence model is used to solve the transport equations for turbulent flow energy and dissipation rate. A total numbers of 432,187 quad grid intervals with a near wall elements spacing of y~+≈ 2 are used. Detailed results about average heat transfer and fluid friction in an artificially roughened solar air heater are presented and discussed. The effects of grid distributions on the numerical predictions are also discussed. It has been observed that for a given constant value of heat flux (1000 W/m~2), the performance of the artificially roughened solar air heater is strong function of the Reynolds number, relative roughness pitch and relative roughness height. Optimum configuration of the roughness element for artificially roughened solar air heater is evaluated.
机译：在本文中，进行了数值研究，以分析相关雷诺数范围为3800至18,000的二维不可压缩的Navier-Stokes流经人工粗糙化太阳能空气加热器的情况。等边三角形截面肋的十二种不同配置（P / e = 7.14-35.71和e / d = 0.021-0.042）已用作粗糙度元素。控制方程通过基于有限体积的数值方法求解。基于商业有限体积的CFD代码ANSYS FLUENT用于模拟通过人工粗糙化的太阳能空气加热器的湍流。 RNGκ-ε湍流模型用于求解湍流能量和耗散率的输运方程。使用总数为432,187个四边形网格间隔，且近壁元素间隔为y〜+≈2。提出并讨论了有关在人工粗糙的太阳能空气加热器中平均传热和流体摩擦的详细结果。还讨论了网格分布对数值预测的影响。已经观察到，对于给定的恒定热通量值（1000 W / m〜2），人工粗糙化的太阳能空气加热器的性能是雷诺数，相对粗糙度间距和相对粗糙度高度的强函数。评估了人工粗糙化太阳能空气加热器的粗糙度元件的最佳配置。

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