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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer of a non-Newtonian fluid (Carbopol aqueous solution) in transitional pipe flow
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Heat transfer of a non-Newtonian fluid (Carbopol aqueous solution) in transitional pipe flow

机译：非牛顿流体（Carbopol水溶液）在过渡管流中的传热

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摘要

An experimental study of the forced convection heat transfer for non-Newtonian fluid flow in a pipe is presented. We focus particularly on the transitional regime. A wall boundary heating condition of heat flux is imposed. The non-Newtonian fluid used is Carbopol (polyacrylic acid) aqueous solutions. Detailed rheology as well as the variation of the rheological parameters with temperature are reported. Newtonian and shear thinning fluids are also tested for comparative purposes. The characterization of the flow and the thermal convection is made via the pressure drop and the wall temperature measurements over a range of Reynolds number from laminar to turbulent regime. Our measurements show that the non-Newtonian character stabilizes the flow, i.e., the critical Reynolds number to transitional flow increases with shear thinning and yield stress. The heat transfer coefficients are given and compared with heat transfer laws for different regime flows. Details when the heat transfer coefficient loses rapidly its local dependence on the Reynolds number are analyzed.
机译：提出了非牛顿流体在管道中强制对流换热的实验研究。我们特别关注过渡制度。施加热通量的壁边界加热条件。所用的非牛顿流体是Carbopol（聚丙烯酸）水溶液。报告了详细的流变学以及流变学参数随温度的变化。为了比较，还测试了牛顿和剪切稀化液。流动和热对流的特征是通过在层流到湍流状态的雷诺数范围内的压降和壁温测量来进行的。我们的测量结果表明，非牛顿特性稳定了流动，即随着剪切变薄和屈服应力，临界雷诺数到过渡流动的数值增加。给出了传热系数，并将其与不同状态流的传热定律进行了比较。详细分析了当传热系数迅速丧失时，其对雷诺数的局部依赖性。

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