...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Modelling and simulation of flow boiling heat transfer
【24h】

Modelling and simulation of flow boiling heat transfer

机译：沸腾传热的建模与仿真

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

Purpose - The purpose of this paper is to describe the development and application of a numerical model for analysis of flow boiling phenomena and heat transfer.rnDesign/methodology/approach - For flow boiling processes, the fluid and vapour flow regimes in connection with the conjugate heat and mass transfer problem for specimen quenching through the entire boiling curve is modelled. Vaporisation and recondensation, the vapour fraction distribution and vapour movement with respect to the liquid are considered in the calculation of the two-phase flow and heat transfer process. The derived flow boiling model is based on a mixture model and bubble crowding model approach for two-phase flow. In addition to the conventional mixture model formulation, here special model implementations have been incorporated that describe: the vapour formation at the superheated solid-liquid interface, the recondensation process of vapour at the subcooled vapour-liquid interface, the mass transfer rate in the different boiling phases and the microconvection effect in the nucleate boiling phase resulting from bubble growth and detachment. Findings - The model prediction results are compared with experimental data for quenching of a circular cylinder, showing good agreement in boiling state and heat transfer coefficient distribution. Simulation and experiments lead to a better understanding of the interaction of incident flow in the boiling state and the resulting heat transfer.rnResearch limitations/implications - Fluid temperatures in the range of 300-353 K and specimen wall temperatures up to 1,000 K are considered.rnPractical implications - Flow boiling is an efficient heat transfer process occurring in several technical applications. Application background of the model development is in quenching of complex metallic specimen geometries in liquids subject to fast changing heat fluxes. Originality/value - A general model for the complex two-phase boiling heat transfer at high wall temperatures and fast flow conditions that can be used in engineering applications does not yet exist. The results provide detailed information describing the non-uniform phase change during the complete quenching process from film boiling to pure convection.
机译：目的-本文的目的是描述用于分析流动沸腾现象和传热的数值模型的开发和应用。设计/方法/方法-对于流动沸腾过程，与共轭物有关的流体和蒸汽流动形式通过整个沸腾曲线对样品淬火的传热和传质问题进行了建模。在两相流动和传热过程的计算中，考虑了汽化和再冷凝，汽相分布和汽相相对于液体的运动。导出的沸腾模型基于两相流的混合模型和气泡拥挤模型方法。除了常规的混合物模型公式外，此处还结合了特殊的模型实现，这些模型描述了：过热固液界面处的蒸汽形成，过冷蒸气-液体界面处的蒸汽再冷凝过程，不同条件下的传质速率沸腾阶段和由于气泡生长和脱离而导致的核沸腾阶段中的微对流效应。研究结果-模型预测结果与圆柱淬火的实验数据进行了比较，显示出沸腾状态和传热系数分布的良好一致性。通过仿真和实验，可以更好地理解沸腾状态下的入射流和由此产生的热传递之间的相互作用。研究限制/意义-考虑流体温度在300-353 K范围内和样品壁温度不超过1000K。实用意义-流动沸腾是一种有效的传热过程，它发生在多种技术应用中。该模型开发的应用背景是在热通量快速变化的液体中淬火复杂的金属试样几何体。原创性/价值-在高壁温和快速流动条件下，复杂的两相沸腾传热的通用模型尚不存在，可用于工程应用。结果提供了详细的信息，描述了从薄膜沸腾到纯对流的完全淬火过程中不均匀的相变。

著录项

  • 来源
  • 作者

  • 作者单位

    Faculty of Production Engineering, Chemical Engineering Department,University of Bremen, Bremen, Germany;

    rnFaculty of Production Engineering, Chemical Engineering Department,University of Bremen, Bremen, Germany;

    rnFaculty of Production Engineering, Chemical Engineering Department,University of Bremen, Bremen, Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    flow; boiling; heat transfer; simulation; modelling;

    机译：流;沸腾;传播热量;模拟;造型;

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