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首页> 外文期刊>Journal of Heat Transfer >Laminar Heat Transfer Behavior of a Phase Change Material Fluid in Microchannels With Staggered Pins
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Laminar Heat Transfer Behavior of a Phase Change Material Fluid in Microchannels With Staggered Pins

机译：相变材料流体在带交错销的微通道中的层流传热行为

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摘要

Microchannels have been studied extensively for a variety of heat transfer applications including electronic cooling. Many configurations of microchannels have been studied and compared for their effectiveness in terms of heat removal. Recently, the use of staggered pins in microchannels has gained considerable traction, since they can promote internal flow fluctuations that enhance internal heat transfer. Furthermore, staggered pins in microchannels have shown higher heat removal characteristics because of the continuous breaking and formation of the heat transfer fluid boundary layer. However, they also exhibit higher pressure drop because the pins act as flow obstructions. This paper presents numerical results of two characteristic staggered 100-µm pins (square and circular) in microchannels. The heat transfer performance of a single phase fluid (SPF) in microchannels with staggered pins, and the corresponding pressure drop characteristics are presented. Furthermore, a phase change material (PCM, n-eicosane) fluid was also considered by implementing the effective specific heat capacity model approach to account for the corresponding phase change process of PCM fluid. Comparisons of the heat transfer characteristics of single phase fluid and PCM fluid are presented for two different pin geometries and three different Reynolds numbers. Circular pins were found to be more effective in terms of heat transfer by exhibiting higher Nusselt number. Micro-channels with circular pins were also found to have lower pressure drop compared to the square-pin microchannels. [
机译：微通道已被广泛研究用于包括电子冷却在内的各种传热应用。研究了微通道的许多配置，并比较了它们在散热方面的有效性。近来，在微通道中交错销的使用已获得相当大的吸引力，因为它们会促进内部流量波动，从而增强内部传热。此外，由于传热流体边界层的连续破坏和形成，微通道中的交错销显示出更高的排热特性。然而，由于销子充当流动障碍物，它们还表现出较高的压降。本文介绍了微通道中两个特性交错的100 µm引脚（正方形和圆形）的数值结果。给出了具有交错销钉的微通道中单相流体（SPF）的传热性能以及相应的压降特性。此外，还通过实施有效的比热容模型方法来考虑相变材料（PCM，正二十烷）流体，以解决PCM流体的相应相变过程。比较了两种不同销形和三种不同雷诺数的单相流体和PCM流体的传热特性。发现圆形销钉通过表现出更高的努塞尔特数在传热方面更有效。还发现具有圆形销钉的微通道比方形销钉的微通道具有更低的压降。 [

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