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首页> 外文期刊>Journal of Applied Polymer Science >Investigations of heat transfer and pressure drop between parallel channels with pseudoplastic and dilatant fluids
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Investigations of heat transfer and pressure drop between parallel channels with pseudoplastic and dilatant fluids

机译：假塑性流体和膨胀流体在平行通道之间的传热和压降研究

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Central to the problem of heat exchangers design is the prediction of pressure drop and heat transfer in the noncircular exchanger duct passages such as parallel channels. Numerical solutions for laminar fully developed flow are presented for the pressure drop (friction factor times Reynolds number) and heat transfer (Nusselt numbers) with thermal boundary conditions [constant heat flux (CHF) and constant wall temperature (CWT)] for a pseudoplastic and dilatant non-Newtonian fluid flowing between infinite parallel channels. A shear rate parameter could be used for the prediction of the shear rate range for a specified set of operating conditions that has Newtonian behavior at low shear rates, power law behavior at high shear rates, and a transition region in between. Numerical results of the Nusselt number [constant heat flux (CHF) and constant wall temperature (CWT)] and the product of the friction factor and Reynolds number for the Newtonian region were compared with the literature values showing agreement within 0.36% in the Newtonian region. For pseudoplastic and dilatant non-Newtonian fluids, the modified power law model is recommended to use because the fluid properties have big discrepancies between the power law model and the actual values in low and medium range of shear rates. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：换热器设计问题的中心是预测非圆形换热器管道通道（如平行通道）中的压降和传热。给出了层流完全展开的流动的数值解，其中包括了假塑性材料的压降（摩擦系数乘以雷诺数）和热传递（努塞尔数）以及热边界条件[恒定热通量（CHF）和恒定壁温（CWT）]。无限平行通道之间流动的非牛顿膨胀流体。剪切速率参数可用于预测一组指定工况的剪切速率范围，该特定工况在低剪切速率下具有牛顿行为，在高剪切速率下具有幂律行为，并且在两者之间具有过渡区域。比较了牛顿地区的Nusselt数[恒定热通量（CHF）和恒定壁温（CWT）]的数值结果以及摩擦系数和雷诺数的乘积，并与文献值进行了比较，表明牛顿区域的一致性在0.36％以内。对于假塑性和膨胀非牛顿流体，建议使用修正的幂定律模型，因为在低和中等剪切速率范围内，流体特性在幂律模型与实际值之间存在很大差异。 （C）2003 Wiley Periodicals，Inc. [参考：23]

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