Heat Transfer of Non-Newtonian Fluids in Agitated Vessels

王凯; 俞生尧

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Heat Transfer of Non-Newtonian Fluids in Agitated Vessels

更新时间：2025-12-16

- Heat Transfer of Non-Newtonian Fluids in Agitated Vessels
- CIESC Journal Issue 4, (1988)
- 作者机构：
  
  浙江大学化工系,浙江大学化工系 ,杭州,杭州
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 August 1988，
  
  Published：25 August 1988
- 稿件说明：
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王凯, 俞生尧. Heat Transfer of Non-Newtonian Fluids in Agitated Vessels[J]. CIESC Journal, 1988, (4).
DOI：

王凯, 俞生尧. Heat Transfer of Non-Newtonian Fluids in Agitated Vessels[J]. CIESC Journal, 1988, (4). DOI：

摘要

基于搅拌桨旋转扭矩和搅拌槽内所有壁面的平均扭矩近似相等的关系

引入流况系数

提出了计算非牛顿流体表观粘度的剪切速率模型.并对内蛇管、外蛇管和直管以及不同几何尺寸的MIG、透平、三叶后掠式、板式、锚和半椭圆片桨组成的多种搅拌体系

用该模型关联夹套侧和冷却管侧的给热系数

分别得到了统一不同几何尺寸搅拌桨的给热系数关联式.该模型适用于不同冷却构件.不同类型、不同几何尺寸的搅拌桨、过渡域和湍流域以及夹套侧和冷却管侧的非牛顿流体给热系数关联.另外

对多种剪切速率模型进行了比较和讨论.

Abstract

Basing on the assumption that the average torque exerted on the wall surface in an agitated vessel is approximately equal to that offered by a rotating impeller and introducing the conception of flow regime coefficient. a new shear rate model used to calculate apparent viscosity of non-Newtonian fluids is proposed. The impellers investigated are MIG impellers

flat blade disc turbines

pfaudler impellers

plate paddles

anchors and a semielliptical board impeller

diversing widely in geometrical configurations respectively. Three types of cooling tubes (inner helical coil

external helical coil and vertical tubes) are respectively equipped inside the vessels. Using the present model

heat transfer correlations are respectively obtained for the three cooling tube systems. The correlations can be used in the design and scale up of industrial agitated vessels. The results indicate that this model can be used to correlate heat transfercoefficients of non-Newtonian fluids in various cases such as different cooling tube systems

various types of impeller

unbaffle or with vertical tubes as baffles

transitional regime or turbulent regime and jacket side or cooling tube side. Comparison between the present shear rate model and those developed previously is also presented.

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