摘要
本研究采用VOF多相流模型,对新型低GWP制冷剂R1336mzz(Z)在微通道内的流动沸腾换热特性进行了数值模拟,探究在不同热流密度(20~40 kW/m^(2))与质量流速(300~600 kg/(m^(2)·s))下通道内流型、换热系数及压降特性的变化。结果表明:流型依次经历泡状流、受限气泡流、弹状流和环状流,热流密度促进流型演化,而质量流速则延缓其过程;沿程局部换热系数表现为先升后降的趋势,在通道后部可能因局部烧干导致换热恶化,随热流密度和质量流速提升沿程压降梯度分别最大增加19.9%和85%。
This study employed the VOF multiphase flow model to numerically simulate the flow boiling heat transfer characteristics of the low-GWP refrigerant R1336mzz(Z)in a microchannel,investigated the variations of flow patterns,heat transfer coefficients,and pressure drop characteristics under different heat fluxes(20~40 kW/m^(2))and mass fluxes(300~600 kg/(m^(2)s)).The results indicate that the flow patterns evolve sequentially from bubbly,confined bubble,and slug to annular flow.Heat flux accelerates the flow pattern development,whereas mass flux slows it down.The local heat transfer coefficient along the channel exhibits a trend of first increasing and then decreasing,with possible deterioration in the downstream due to local dryout.With increasing heat flux and mass flux,the maximum pressure drop gradient increases by 19.9%and 85%,respectively.
作者
王子璇
彭启
孙小琴
李杰
银了飞
党超
Wang Zixuan;Peng Qi;Sun Xiaoqin;Li Jie;Yin Liaofei;Dang Chao(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《低温与超导》
北大核心
2025年第11期56-63,89,共9页
Cryogenics and Superconductivity
基金
国家自然科学基金(52506067,52578108)
长沙市自然科学基金(kq2502132)资助。
