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首页> 外文期刊>Journal of Heat Transfer >Enhanced Flow Boiling of Ethanol in Open MicroChannels With Tapered Manifolds in a Gravity-Driven Flow
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Enhanced Flow Boiling of Ethanol in Open MicroChannels With Tapered Manifolds in a Gravity-Driven Flow

机译：重力驱动流中具有锥形歧管的开放式微通道中乙醇的增强流沸腾

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摘要

There is a clear need for cooling high heat flux generating electronic devices using a dielectric fluid without using a pump. This paper explores the feasibility of employing ethanol as a dielectric fluid in a horizontal, open microchannel heat sink configuration with a tapered gap manifold to yield very low pressure head requirements. The paper presents experimental results for such a system utilizing ethanol as a working fluid under gravity-driven flow. A heat flux of 217W/cm~2 was dissipated with a pressure drop of only 9kPa. The paper further presents parametric trends regarding flow rate and pressure drop characteristics that provide basic insight into designing high heat flux systems under a given gravity head requirement. Based on the results, interrelationships and design guidelines are developed for the taper, ethanol flow rate and imposed heat flux on heat transfer coefficient and gravity head requirement for electronics cooling. Reducing flow instability, reducing pressure drop, and enhancing heat transfer performance for a dielectric fluid will enable the development of pumpless cooling solutions in a variety of electronics cooling applications.
机译：显然需要使用介电液而不使用泵来冷却产生高热通量的电子设备。本文探讨了在具有锥形间隙歧管的水平，开放式微通道散热器配置中使用乙醇作为介电液以产生非常低的压头要求的可行性。本文介绍了在重力驱动下利用乙醇作为工作流体的这种系统的实验结果。散热量为217W / cm〜2，压降仅为9kPa。本文还介绍了有关流量和压降特性的参数趋势，这为在给定重力压头要求下设计高热通量系统提供了基本见识。根据结果​​，针对锥度，乙醇流速以及热通量对传热系数和电子冷却所需的重力头的相互关系和设计指南进行了开发。减少流动的不稳定性，减少压降并增强介电流体的传热性能，将使开发各种电子冷却应用中的无泵冷却解决方案成为可能。

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