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首页> 外文期刊>Journal of Heat Transfer >Laminar Forced Convection in Viscous Shear-Thinning Liquid Flows Inside Circular Pipes: Case for a Modified Power-Law Rheology
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Laminar Forced Convection in Viscous Shear-Thinning Liquid Flows Inside Circular Pipes: Case for a Modified Power-Law Rheology

机译：层状抗剪切薄液中的流体强制对流，圆形管道内部流动：改进的电力法流变案

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摘要

Laminar forced convection in viscous, non-Newtonian polymeric liquids that exhibit pseudoplastic or shear-thinning behavior is characterized. The fluid rheology is characterized by a new asymptotic power-law (APL) model, which appropriately represents extensive data for apparent viscosity variation with shear rate-from the low-shear constant-viscosity plateau to shear thinning at high shear rates. This is contrasted with the traditional Ostwald-de-Waele or power-law (PL) model that invariably over-extends the pseudoplasticity in the very low shear-rate region. The latter's limitations are demonstrated by computationally obtaining frictional loss and convective heat transfer results for fully developed laminar flows in a circular pipe maintained at uniform heat flux. The Fanning friction factor and Nusselt number, as would be anticipated from the rheology map of pseudoplastic fluids, are functions of flow rate with the APL model unlike the Newtonian-like constant value obtained with the PL model. Comparisons of the two sets of results highlight the extent of errors inherent in the PL rheology model, which range from 23% to 68% for frictional loss and 3.8% to 13.7% for heat transfer. The new APL rheology model is thus shown to be the more precise characterization of viscous shear-thinning fluids for their thermal processing applications with convective heat transfer.
机译：表征具有假塑料或剪切稀疏行为的粘性非牛顿聚合物液体中的层状迫使对流。流体流变学的特征在于一种新的渐近电力 - 法（APL）模型，其适当地表示具有剪切速率的明显粘度变化的广泛数据 - 从低剪切恒定粘度平台以高剪切速率剪切稀疏。这与传统的OSTWALD-DE-WAELE或POWER-LAW（PL）模型形成鲜明对比，其总是过度延伸在非常低剪切速率区域中的假塑性度。通过计算地获得摩擦损失和对流传热结果来证明后者的限制，并在保持在均匀的热通量的圆形管道中的完全开发的层状流动。扇动摩擦因子和露珠数，如将从假塑性流体的流变图预期的，是与APL模型不同的流速，与使用PL模型获得的牛顿样常数值不同。两组结果的比较突出了PL流变型模型固有的误差的程度，其摩擦损失的23％至68％，传热的3.8％至13.7％。因此，新的APL流变模型被示出为具有对流热传递的热处理应用的粘性剪切变薄流体的更精确表征。

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  • 来源
    《Journal of Heat Transfer》 |2020年第12期|121802.1-121802.9|共9页
  • 作者

    J. Subedi; S. Rajendran; R. M. Manglik;

  • 作者单位

    Thermal-Fluids and ThermalProcessing Laboratory Department of Mechanical and Materials Engineering University of Cincinnati Cincinnati OH 45221;

    Thermal-Fluids and Thermal Processing Laboratory Department of Mechanical and Materials Engineering University of Cincinnati Cincinnati OH 45221;

    Fellow ASME Thermal-Fluids and Thermal Processing Laboratory Department of Mechanical and Materials Engineering University of Cincinnati Cincinnati OH 45221;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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