摘要
为了解泡沫金属沸腾传热原理,建立了泡沫金属圆管三维物理模型,采用BrinkmanForchheimer扩展达西动量方程和C语言编写气液两相质量传递和能量传递的自定义函数,对泡沫金属圆管中沸腾传热现象进行数值模拟,分析了质量流率、干度对流型、压降和沸腾传热系数的影响。模拟结果表明,在一定质量流率下,单位长度压降随着干度的增大成非线性增长趋势;低质量流率时,随着干度的增大,管内流型由分层流过渡到波状流进而过渡到稳定的波状流,传热系数变小;高质量流率时,随着干度的增大,管内流型由弹状流过渡到环状流,传热系数变大。
In order to know boiling heat transfer theory in metal foam,a three- dimensional physical mode of metal foam tube was established. Using the Brinkman- Forchheimer extended Darcy equation and compiling user- defined function( UFD) of the mass and energy transfer between vapor phase and liquid phase by C language,the boiling heat transfer in metal foam tube was simulated to analyze the influence of mass flow rate and vapor quality to flow pattern,pressure drop and boiling heat transfer coefficient. The results show that,with the given mass flow rate,the pressure drop nonlinearly increases as the vapor quality rises; At the low mass flow rate,with the increasing of vapor quality,the flow pattern converts to wavy flow from stratified flow and then turns to stratified wavy flow,while the heat transfer coefficient decreases. At the high mass flow rate,with the increasing of vapor quality,the flow pattern converts to annular flow from slug flow,while the heat transfer coefficient increases.
出处
《节能技术》
CAS
2014年第3期250-254,共5页
Energy Conservation Technology
关键词
泡沫金属
流型
压降
沸腾传热
数值模拟
metal foam
flow pattern
pressure drop
boiling heat transfer
numerical simulation
