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首页> 外文会议>ASME summer heat transfer conference 2008 >AXIAL HEAT CONDUCTION IN COUNTER FLOW MICROCHANNEL HEAT EXCHANGERS
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AXIAL HEAT CONDUCTION IN COUNTER FLOW MICROCHANNEL HEAT EXCHANGERS

机译：逆流微通道换热器的轴向传热

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摘要

This paper analyzes the effect of axial heat conduction on the thermal performance of a balanced counter flow microchannel heat exchanger. The ends of the wall separating the coolants are subjected to the mixed-boundary condition. Analytical equations were developed for predicting the axial temperature of the fluids and the wall as well as the effectiveness of the fluids. Moreover, equations for determining the heat transferred between the heat exchanger and its surroundings have been provided in this paper. The effectiveness of the fluids depended on the NTU, axial heat conduction parameter, manifold fluid temperatures and Biot numbers (of the manifolds). By varying the Biot number the model presented here can be used for designing a MCHX_(CF) with Dirichlet, Neumann or mixed boundary condition at the ends of the wall separating the coolants. At very low values of Biot number the end walls act as if they are insulated. At these values of Biot numbers the effectiveness of the fluids degraded with increase in axial heat conduction parameter for a particular NTU. At very high values of Biot number the end walls assume a temperature that is close to the temperature in the manifold. At high values of Biot number the effectiveness of the fluids can either improve or degrade depending on the manifold temperatures. Moreover, the model developed in this paper has been verified using existing models that consider either adiabatic or isothermal condition at the end walls.
机译：本文分析了轴向传热对平衡逆流微通道换热器热性能的影响。分隔冷却剂的壁的端部处于混合边界条件。开发了用于预测流体和壁的轴向温度以及流体有效性的分析方程式。此外，本文还提供了确定热交换器及其周围环境之间传递的热量的方程式。流体的有效性取决于NTU，轴向导热参数，歧管流体温度和（歧管的）比奥数。通过改变比奥数，此处介绍的模型可用于设计在分隔冷却剂的壁端部具有Dirichlet，Neumann或混合边界条件的MCHX_（CF）。在非常低的比奥数值下，端壁的作用就像是绝缘的。在这些比奥数值下，对于特定的NTU，流体的有效性会随着轴向导热参数的增加而降低。在非常高的比奥数值下，端壁的温度接近歧管中的温度。在高的毕奥数时，根据歧管温度的不同，流体的有效性可能会提高或降低。而且，本文开发的模型已经使用考虑端壁绝热或等温条件的现有模型进行了验证。

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