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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：旋流和传递流相互作用的传热设备中的传热效率

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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：设计用于不同应用的动力装置的效率取决于其功率密度，重量，尺寸和可靠性，可以通过引入新的工程解决方案来提高传热设备（HTA）放热表面上的传热速率来提高效率。 ）。通常通过使用相互作用的涡旋流来增强热传递。由于涡旋和过渡（节距等于无穷大）沿着凸形的散热面流动，从而实现了传热的增强。估计了具有凸形和凹形散热表面的HTA的效率，在该表面上正好使用此传热增强方法。选择环形通道作为基本HTA。该选择是由于以下事实：通道元件（即，外管具有凹形的放热表面，而内杆具有凸形的放热表面）是各种热交换器和核电设备的组成部分。在评估HTA的效率时，使用了已知的光滑环形通道中传热和水力阻力的相关关系，以及作者获得的具有旋流和过渡流的环形通道凹凸表面上的传热系数关系。已经证明，在一定范围的流动条件和几何形状下，随着传热表面上的涡旋流和过渡流的相互作用，传热的增加大于水力阻力的增加。根据已知标准对HTA的有效性进行评估后发现，使用相互作用的涡旋流和传递流的传热增强方法在有效性方面可与其他已知的传热增强方法相媲美。

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