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首页> 外文期刊>International Journal of Heat and Mass Transfer >Non-Newtonian power-law flow and heat transfer across a pair of side-by-side circular cylinders
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Non-Newtonian power-law flow and heat transfer across a pair of side-by-side circular cylinders

机译：非牛顿幂律流和传热通过一对并排的圆柱体

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摘要

Flow and heat transfer of non-Newtonian power-law fluids across a pair of identical circular cylinders in side-by-side arrangement are investigated numerically by solving the continuity, momentum and energy equations along with the appropriate boundary conditions. The numerical calculations are performed in an unconfined computational domain for the following range of physical parameters: Reynolds number, Re = 1-40 and power-law index, n = 0.4-1.8 (covering shear-thinning, n < 1; Newtonian, n = 1 and shear thickening, n > 1 behaviors) for gap ratio, T/D = 1.5-4.0 at a constant Prandtl number of 50. The global characteristics such as drag coefficients and average Nusselt number, etc. are calculated and the repre sentative streamline and isotherm contours are presented for the above range of conditions. It has been found that the individual and overall drag coefficients decrease and the average Nusselt number increases with Reynolds number for all T/D and n considered here. The heat transfer is found higher in shear-thinning fluids than Newtonian fluids and followed by shear-thickening fluids for 1.5 ≤ T/D ≤ 4.0 and 1 ≤ Re ≤ 40.
机译：通过求解连续性，动量和能量方程以及适当的边界条件，数值研究了非牛顿幂律流体在并排布置的一对相同圆柱体上的流动和传热。数值计算是在以下范围的物理参数的无限制计算域中进行的：雷诺数，Re = 1-40，幂律指数，n = 0.4-1.8（覆盖剪切稀化，n <1；牛顿，n = 1且剪切增稠，n> 1行为），间隙比，T / D = 1.5-4.0，恒定的Prandtl数为50。计算了整体特性，例如阻力系数和平均Nusselt数等，并表示给出了以上条件范围的流线和等温线等值线。已经发现，对于这里考虑的所有T / D和n，单独的阻力系数和总体阻力系数减小并且平均努塞尔数随着雷诺数增加。发现在剪切稀化流体中的传热高于牛顿流体，然后在1.5≤T / D≤4.0和1≤Re≤40的情况下是剪切增稠流体。

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