• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of aspect ratio on saturated flow boiling in microchannels
【24h】

Effect of aspect ratio on saturated flow boiling in microchannels

机译：长宽比对微通道内饱和流沸腾的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, effect of aspect ratio (AR) on the saturated flow boiling characteristics of deionized water in parallel rectangular microchannels are investigated experimentally. Detailed flow visualizations are conducted as well as temperature and pressure measurements. Effects of heat and mass flux are examined, too. Six different silicon microchannel heat sinks, each of which consists of 29 parallel rectangular microchannels, have been used. In order to determine the effect of the aspect ratio (width to depth), the microchannels having different widths and heights but same hydraulic diameters (100 μm) are used. Experiments have been conducted for various values of the mass flux covering 151, 195, 238, 281 and 324 kg/m~2s, the values of the wall heat flux in the range of 71-131 kW/m~2 and various values of the aspect ratio including 0.37, 0.82, 1.22, 2.71, 3.54 and 5.00. The inlet temperature of deionized water is kept constant at 50 ± 1 ℃ through the tests. It is obtained that heat transfer coefficient increases with an increase in the aspect ratio up to AR = 3.54 and then decreases. AR = 1.22 has been appeared as a threshold value for the heat transfer coefficient. There is no regular relationship between the aspect ratio and total pressure drop. The flow visualization results provide key findings for underlying physical mechanism. Quasi-periodical rewetting and drying phenomena, rapid bubble growth and elongation towards both upstream and downstream of the channels and reverse flow are observed in parallel microchannels. In addition, strong interactions are obtained between neighboring channels.
机译：在这项研究中，实验研究了纵横比（AR）对平行矩形微通道中去离子水饱和流动沸腾特性的影响。进行详细的流量可视化以及温度和压力测量。还检查了热量和质量通量的影响。已经使用了六个不同的硅微通道散热器，每个散热器由29个平行的矩形微通道组成。为了确定纵横比（宽度与深度）的影响，使用具有不同宽度和高度但具有相同水力直径（100μm）的微通道。对于覆盖151、195、238、281和324 kg / m〜2s的质量通量的各种值，壁热通量的值在71-131 kW / m〜2的范围内以及长宽比包括0.37、0.82、1.22、2.71、3.54和5.00。通过测试，去离子水的入口温度保持恒定在50±1℃。得到的传热系数随着长宽比的增加而增加，直到AR = 3.54，然后降低。 AR = 1.22作为传热系数的阈值出现。长宽比和总压降之间没有规则的关系。流程可视化结果为基础物理机制提供了重要发现。在平行微通道中观察到准周期性的再润湿和干燥现象，气泡的快速生长和向通道上游和下游的延伸以及逆流。另外，在相邻信道之间获得了强大的交互作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号