摘要
本文提出了基于气液环状流的水平螺旋微肋管内沸腾传热理论预测模型。在模型建立过程中,假设环状流液膜是由基底液膜和叠加扰动波液膜单元组成,将无量纲准则数Fr_0=G/[gd_eρ_v(ρ_l-ρ_v)]^(0.5)作为汽液两相流环状流理论模型的判据建立的模型理论预测值与已由的四种不同结构的微肋管、三种有机工质下得到的实验数据进行了比较,结果表明,在Fr_0>4.0时,提出的环状流预测值理论值或者和预测值符合得较好,或者大幅度改善了原有分层流模型的预测效果,充分说明了提出的环状流理论模型的合理性。
The gas-liquid annular flow model of evaporation heat transfer in helically grooved, horizontal microfin tubes has been developed.It was assumed that annular liquid film is characterized by a substrate layer film and a wavy liquid film driven by disturbance.The critical dimensionless Fr_0=G/[gd_eρ_v(ρ_l-ρ_v)]^(0.5) was served as a criterion of presence of gas-liquid two-phase annular flow.A comparison between theoretical simulation and available experimental data for four tubes and three refrigerants has been conducted.A good agreement between theoretical model and available experiments was obtained for the case Fr_0>4.0.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第z1期177-180,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目资助(No.50536020
No.50676077)
关键词
微肋管
环状流
沸腾传热
micro-fin tube
annular flow
evaporation heat transfer
