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首页> 外文期刊>Brazilian journal of chemical engineering >DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW
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DETERMINATION OF THE EFFECTIVE RADIAL THERMAL DIFFUSIVITY FOR EVALUATING ENHANCED HEAT TRANSFER IN TUBES UNDER NON-NEWTONIAN LAMINAR FLOW

机译：确定非牛顿层流下管内强化传热的有效径向热扩散率的测定

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AbstractEnhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification of the Graetz problem for non-Newtonian power-law flow is proposed to take into account the augmented heat transfer by the introduction of an effective radial thermal diffusivity. The induced mixing was modeled as an increased radial heat transfer in a straight tube. Three experiments using a coiled tube and a tubular heat exchanger with high relative wall roughness are presented in order to show how this parameter can be obtained. Results were successfully correlated with Reynolds number. This approach can be useful for modeling laminar flow reactors (LFR) and tubular heat exchangers available in the chemical and food industries.
机译：摘要在层流条件下，在盘管或波纹管中或存在高壁相对粗糙度，弯曲，管件或机械振动的情况下，发现管中的传热增强。由于诱导的二次流，对这些情况进行建模可能很复杂。提出了针对非牛顿幂律流的Graetz问题的修正，以考虑通过引入有效的径向热扩散率来增加传热。将诱导的混合建模为直管中径向传热的增加。为了显示如何获得该参数，提出了使用盘管和具有较高相对壁粗糙度的管状热交换器进行的三个实验。结果已成功与雷诺数相关。该方法可用于对化学和食品工业中可用的层流反应器（LFR）和管式热交换器进行建模。

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