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首页> 外文期刊>Thermal engineering >The Efficiency of Heat Transfer in Heat-Transfer Apparatuses with Interacting Swirled and Transit Flows
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The Efficiency of Heat Transfer in Heat-Transfer Apparatuses with Interacting Swirled and Transit Flows

机译：相互作用旋转和运输流动传热装置中的传热效率

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摘要

The efficiency of power units designed for different applications is determined by their power density, weight, dimensions, and reliability, and it can be increased by introducing new engineering solutions to increase heat transfer rate on heat-release surfaces in heat-transfer apparatuses (HTA). Heat transfer is often enhanced through the use of interacting swirled flows. The heat-transfer enhancement is achieved due to interaction of swirled and transit (with a pitch equal to infinity) flows along a convex heat-release surface. The efficiency is estimated of HTAs with convex and concave heat-release surfaces on which precisely this method of heat-transfer enhancement is used. An annular channel is selected as the basic HTA. This selection is due to the fact that the channel elements (i.e., the outer pipe has a concave heat-release surface, and the inner rod has a convex release surface) are components of various heat exchangers and nuclear power installations. In evaluating the efficiency of HTAs, the known correlations for heat transfer and hydraulic resistance in smooth annular channels and the relationships for heat transfer coefficient on convex and concave surfaces of annular channels with swirled and transit flows obtained by the author were used. It is demonstrated that an increase in the heat transfer is greater than a rise in the hydraulic resistance with the interaction of swirled and transit flows at heat-transfer surfaces in a certain range of flow conditions and geometries. Evaluation of the HTA’s effectiveness based on the known criteria has revealed that the heat-transfer enhancement method using interacting swirled and transit flows is comparable in terms of its effectiveness with other known methods of heat-transfer augmentation.
机译：专为不同应用设计的功率单元的效率由它们的功率密度，重量，尺寸和可靠性决定，可以通过引入新的工程解决方案来增加传热装置中的热释放表面上的传热速率（HTA ）。通过使用相互作用的旋转流程通常会增强传热。由于涡旋和转运的相互作用（具有等于无穷大的间距）的相互作用，实现了传热增强，沿凸热释放表面流动。用凸起的HTA估计凸起和凹面的释放表面的效率，其精确地使用了这种热传递增强方法。选择环形通道作为基本HTA。该选择是由于沟道元件（即外管具有凹形释放表面，内杆具有凸释放表面）的事实是各种热交换器和核电装置的组件。在评估HTA的效率时，使用了通过作者获得的凸出的环形通道中的传热和液压阻力的相关性和液压阻力以及由作者获得的旋转和传输流的环形通道的凹凸和凹面的关系。结果表明，传热的增加大于液压阻力的升高，其在一定范围的流动条件和几何形状中在传热表面处的旋转和传输流动的相互作用。基于已知标准的HTA的效果评价揭示了使用与其他已知的传热增强方法的有效性相比，使用相互作用的传热增强方法是可比的。

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