Numerical Simulation of Vapor-Liquid Interfaces During Saturated and Subcooled Film Boiling

饱和及过冷薄膜沸腾过程中汽液界面的数值模拟

基本信息

批准号：
9322418
负责人：
Vijay Dhir
金额：
$ 20.15万
依托单位：
University of California-Los Angeles
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-05-01 至 1999-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9322418&HistoricalAwards=false
关键词：
Numerical Simulation Vapor Liquid Interfaces

项目摘要

ABSTRACT CTS-9322481 Dhir Vapor-liquid interface shape during saturated or subcooled film boiling on a vertical surface is governed by Kelvin-Helmholtz Instability whereas it is the Raleigh-Taylor instability that governs the configuration of the interface during film boiling on horizontal surfaces. The evolution of the interface and the induced flow field govern the heat and mass transfer across the interface and in turn the heat transfer from the heater surface. In this study a complete numerical simulation of the evolution of the vapor-liquid interface and the accompanied flow and temperature field in the vapor and the liquid is proposed. The simulation will be carried out without introducing any empirical constants and will include both linear and non-linear growth of the interfacial instabilities. In the first phase, the effort will be limited to only two dimensions, and spectral collocation method along with SIMPLE algorithm will be used to numerically integrate the governing equations. The numerical results will also yield the wall superheats at which a continuous vapor film could not be supported on the heater surface. Thus the results will provide a completely theoretical basis for prediction of minimum heat fluxes. The numerical effort will be supported with experimental data already reported in the literature. If deemed necessary, existing experimental facilities will be used to obtain the required data on vertical and/or horizontal plates.

摘要 CTS-9322481 Dhir 垂直表面上饱和或过冷薄膜沸腾期间的汽液界面形状受开尔文-亥姆霍兹不稳定性控制，而罗利-泰勒不稳定性则控制水平表面上薄膜沸腾期间界面的构型。界面的演变和诱导流场控制着界面上的传热和传质，进而控制来自加热器表面的传热。在这项研究中，提出了汽液界面演化以及汽液中伴随的流动和温度场的完整数值模拟。模拟将在不引入任何经验常数的情况下进行，并将包括界面不稳定性的线性和非线性增长。在第一阶段，工作将仅限于二维，并且将使用谱搭配方法和SIMPLE算法对控制方程进行数值积分。数值结果还将产生壁过热度，在该过热度下，加热器表面无法支撑连续的蒸汽膜。因此，该结果将为最小热通量的预测提供完整的理论基础。数值工作将得到文献中已报道的实验数据的支持。如果认为有必要，将使用现有的实验设施来获取垂直和/或水平板上所需的数据。