• 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 >Numerical model to estimate subcooled flow boiling heat flux and to indicate vapor bubble interaction
【24h】

Numerical model to estimate subcooled flow boiling heat flux and to indicate vapor bubble interaction

机译：估计亚冷流量沸腾热通量的数值模型及指示蒸气气泡相互作用

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

There are numerous technical applications where hot components, with uneven temperature distribution, require cooling. In such applications, it is desired to provide efficient local cooling of the hot spots, while avoiding unnecessary over-cooling of the other regions. Such an approach, known as precision cooling, has several advantages. In addition to the fact that it reduces the effort for cooling, it limits the unintended heat lost to the cooling medium. In liquid cooled systems, such as Internal Combustion Engines (ICE), subcooled flow boiling offers immense potential for precision cooling. The primary challenges in extracting this potential are understanding the complexities in the subcooled flow boiling phenomenon and estimating the risk of encountering film boiling. The present study introduces a numerical model to estimate the wall heat flux in subcooled flow boiling and the model includes a mechanistic formulation to account for vapor bubble interaction. The formulation for vapor bubble interaction serves two purposes: (a) blends two well-established models in the literature, one in the isolated bubbles regime and other in the fully developed boiling regime, to estimate the wall heat flux; and (b) provides information to limit boiling in order to not encounter film boiling. The results from the new model are validated with two different experiments in the literature and the wall heat flux estimated by the model is in agreement with experimental results and responsive to different input parameters, such as bulk velocity, operating pressure and inlet subcooling. The new model requires only input of local flow quantities and hence implementation in Computational Fluid Dynamics (CFD) is straightforward.
机译：有许多技术应用，热部件，温度分布不均，需要冷却。在这种应用中，希望提供热点的有效局部冷却，同时避免不必要地过冷却其他区域。这种方法称为精确冷却，具有若干优点。除了它减少冷却努力的事实之外，它还限制了对冷却介质损失的意外热量。在液体冷却系统中，如内燃机（冰），过冷却流沸腾提供了精密冷却的巨大潜力。提取这种潜力的主要挑战是了解脱池流沸腾现象中的复杂性并估算遇到膜沸腾的风险。本研究介绍了一种数值模型，以估计过冷流沸腾中的壁热通量，并且该模型包括机械制剂以考虑蒸气泡相互作用。蒸汽泡相互作用的制剂用于两个目的：（a）在文献中混合两个在孤立的泡沫制度中的两个良好建立的模型，在完全开发的沸腾制度中，以估计壁热通量; （b）提供限制沸腾的信息，以便不遇到薄膜沸腾。新模型的结果用文献中的两个不同的实验验证，模型估计的壁热通量与实验结果一致，响应于不同的输入参数，例如散装速度，操作压力和入口过冷。新模型仅需要输入局部流量，因此在计算流体动力学（CFD）中的实现是简单的。

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