• 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 >Thermal design and operational limits of two-phase micro-channel heat sinks
【24h】

Thermal design and operational limits of two-phase micro-channel heat sinks

机译：两相微通道散热器的热设计和运行限制

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

While the vast majority of published studies on two-phase micro-channel heat sinks have been focused on determination of pressure drop and heat transfer coefficient, very few studies have addressed the operational limits of these devices. This study provided a comprehensive methodology for thermal design of micro-channel heat sinks with saturated inlet conditions. This includes predictive methods for pressure drop and heat transfer coefficient using universal correlations that rely on large databases amassed from numerous sources, and which encompass many working fluids, and very broad ranges of hydraulic diameter, mass velocity, inlet pressure, and inlet quality. This is followed by predictive tools for thermal limits associated with dryout incipience and premature critical heat flux, as well as two-phase critical flow limit. The three limits are combined to define an envelope for acceptable heat sink performance. Using these tools, a parametric study is performed to determine the variation of maximum heat flux with total volumetric flow rate for different combinations of the channel's geometrical parameters for three working fluids, HFE-7100, R134a, and water. Then, the values of maximum heat flux are used to assess corresponding variations of pressure drop and maximum bottom wall temperature of the heat sink. It is shown that maximum heat flux is dominated by different limits for different flow rate ranges, and may be increased significantly, while decreasing bottom wall temperature, by using a large number of small channels. Furthermore, using deeper micro-channels is shown to increase maximum heat flux and decrease pressure drop, while producing a relatively weak adverse effect on bottom wall temperature.
机译：尽管有关两相微通道散热器的绝大多数已发表的研究都集中在确定压降和传热系数上，但很少有研究解决这些设备的运行限制。这项研究为具有饱和入口条件的微通道散热器的热设计提供了一种全面的方法。这包括使用通用相关性的压降和传热系数的预测方法，这些相关性依赖于从大量数据源中收集的大型数据库，其中包含许多工作流体，以及很大的水力直径，质量速度，入口压力和入口质量范围。然后是预测工具，用于与干燥开始和过早的临界热通量相关的热极限以及两相临界流量极限。将这三个限制结合起来，可以定义一个可以接受的散热器性能的范围。使用这些工具，进行了参数研究，以确定三种工作流体HFE-7100，R134a和水的通道几何参数的不同组合的最大热通量随总体积流量的变化。然后，将最大热通量的值用于评估散热器的压力降和最大底壁温度的相应变化。结果表明，通过使用大量小通道，最大热通量受到不同流量范围的不同限制，并且可能显着增加，同时降低底壁温度。此外，显示出使用更深的微通道可增加最大热通量并减少压降，同时对底壁温度产生相对较弱的不利影响。

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