Heat transfer in non-Newtonian falling liquid film on a horizontal circular cylinder
Heat transfer in non-Newtonian falling liquid film on a horizontal circular cylinder
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DOI：
10.1007/s002310100265
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发表时间：
2002-08
影响因子：
2.2
通讯作者：
D. Ouldhadda;A. Idrissi;M. Asbik
中科院分区：
文献类型：
--
作者：
D. Ouldhadda;A. Idrissi;M. Asbik
本文研究了定热流和等温边界条件下水平圆柱表面假塑性非牛顿液膜的层流流动和传热。考虑了惯性项。采用隐式有限差分法求解控制边界层方程。详细研究和讨论了操作参数对流体动力学和传热特性的影响。结果表明，局部和平均努塞尔数的变化显着的羧甲基纤维素（CMC）水溶液的浓度和圆柱直径的函数。CMC水溶液的浓度越高，传热系数越大。最后，与牛顿流体的文献中的实验和数值计算结果的比较清楚地表明，目前的分析是相当准确的。
This study aims to investigate numerically the laminar flow and heat transfer in a pseudoplastic non-Newtonian falling liquid film on a horizontal cylinder for the constant heat flux and isothermal boundary conditions. The inertia terms are taken into account. An implicit finite difference method is carried out to solve the governing boundary layer equations. The effects of operational parameters on the hydrodynamic and heat transfer characteristics are examined and discussed in detail. The results presented show that the local and average Nusselt numbers varies significantly as a function of the concentration of aqueous carboxymethylcellulose (CMC) solutions and the cylinder diameter. Higher concentration of aqueous CMC solutions generate larger heat transfer coefficients. Finally, a comparison with the experimental and numerical results available in the literature for Newtonian fluids shows clearly that the present analysis is reasonably accurate.