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Transport phenomena in single-phase and two-phase micro-channel heat sinks.

机译：单相和两相微通道散热器中的传输现象。

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摘要

Various transport phenomena in micro-channel heat sinks were investigated in this thesis work. Included are single-phase pressure drop and heat transfer, incipient boiling heat flux, two-phase flow instability, flow patterns, flow boiling heat transfer, flow boiling pressure drop, and critical heat flux (CHF). A micro-channel heat sink experimental facility was designed and constructed. The micro-channel heat sink was fabricated from oxygen-free copper and contained twenty-one parallel rectangular 231 x 713 mum (215 x 821 mu m for critical heat flux experiments) micro-channels. Deionized water was the working liquid. Single-phase pressure drop and heat transfer were studied experimentally and numerically, with excellent agreement. Experiments were performed to measure incipient boiling heat flux. A mechanistic model based on bubble departure criterion was developed, whose predictions showed good agreement with the experimental data. Two types of two-phase hydrodynamic instability were identified: severe pressure drop oscillation and mild parallel channel instability. The former was eliminated by throttling a control valve upstream of the heat sink. Moderate to high heat fluxes produced mostly annular flow. Experiments were also conducted on flow boiling heat transfer and pressure drop. Previous heat transfer correlations were assessed and deemed inaccurate. Previous two-phase pressure drop correlations were also examined, and a new correlation was proposed which shows better accuracy than prior correlations. An annular flow model was developed, incorporating unique features of two-phase micro-channel flow. Good agreement was achieved between the model predictions and experimental data for both flow boiling heat transfer and pressure drop. Experimental critical heat flux (CHF) was found to be independent of inlet temperature, but CHF increased with increasing mass velocity. A new CHF correlation was proposed for two-phase micro-channel heat sink that shows excellent accuracy in predicting existing heat sink data. Based on the fundamental understanding of the various transport phenomena associated with two-phase micro-channel flow, a comprehensive methodology was developed for optimizing the design of a two-phase micro-channel heat sink. The proposed optimization methodology yields an acceptable design region encompassing all possible micro-channel dimensions corresponding to a prescribed coolant flow rate or pressure drop.
机译：本文研究了微通道散热器中的各种传输现象。包括单相压降和传热，初期沸腾热通量，两相流不稳定性，流型，流沸腾传热，流沸腾压降和临界热通量（CHF）。设计并建造了一个微通道散热器实验设备。该微通道散热器由无氧铜制成，包含21个平行的矩形231 x 713微米（对于临界热通量实验为215 x 821微米）微通道。去离子水是工作液体。实验和数值研究了单相压降和传热，具有很好的一致性。进行实验以测量初期沸腾热通量。建立了基于气泡偏离准则的力学模型，其预测结果与实验数据吻合良好。确定了两种类型的两相水动力不稳定性：严重的压降振荡和轻度的平行通道不稳定性。通过节流散热器上游的控制阀消除了前者。中到高热通量主要产生环形流动。还进行了流沸腾传热和压降实验。先前的传热相关性已评估并认为不准确。还检查了先前的两相压降相关性，并提出了一种新的相关性，该相关性显示出比以前的相关性更好的准确性。开发了环形流动模型，该模型结合了两相微通道流动的独特功能。流动沸腾传热和压降的模型预测与实验数据之间取得了很好的一致性。发现实验临界热通量（CHF）与入口温度无关，但是CHF随着质量速度的增加而增加。提出了一种用于两相微通道散热器的新的CHF相关性，该相关性在预测现有散热器数据方面显示出极好的准确性。基于对与两相微通道流相关的各种传输现象的基本了解，开发了一种用于优化两相微通道散热器设计的综合方法。所提出的优化方法产生了一个可接受的设计区域，其中包含与规定的冷却剂流速或压降相对应的所有可能的微通道尺寸。

著录项

  • 作者

    Qu, Weilin.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 220 p.
  • 总页数 220
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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