In the paper presented is analysis of convective flow heat transfer at supercritical pressure in channels of heat exchanger working in the thermodynamic cycle. The modelling is based on the division of the flow into three regions, namely the heavy fluid, a two phase flow consisting of the heavy and light fluids and finally the light fluid flow. Modelling is concentrated on the region of simultaneous flow of two fluids divided into the zones with the light and heavy fluids. These agents are considered with averaged thermophysical properties in each region. The surface separating the two zones with respective fluids is assumed to feature the pseudocritical temperature. The problem is solved using a previously developed theoretical model based on considerations of energy dissipation in the flow. The fundamental hypothesis in the model is the fact that heat transfer is considered as being dependent on two contributions of energy dissipation, one stemming from the shearing pseudo two-phase flow of the heavy and light fluids, whereas the second contribution comes from the energy dissipation due to exchange of mass between the heavy and light fluids. The results of calculations have been compared with some experimental data from literature showing a good consistency.

中文翻译：

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超临界压力换热器传热建模

本文介绍了在热力循环中工作的换热器通道中超临界压力下对流换热的分析。该建模基于将流动划分为三个区域，即重流体、由重流体和轻流体组成的两相流以及最后的轻流体流。建模集中在两种流体同时流动的区域，分为轻流体和重流体区域。这些试剂被认为具有每个区域的平均热物理特性。假设将两个区域与各自的流体分开的表面具有伪临界温度。该问题是使用先前开发的基于流动中能量耗散考虑的理论模型来解决的。模型中的基本假设是，传热被认为取决于能量耗散的两个贡献，一个来自重流体和轻流体的剪切伪两相流，而第二个贡献来自能量耗散由于重流体和轻流体之间的质量交换。计算结果与文献中的一些实验数据进行了比较，显示出良好的一致性。