摘要
研究气泡浮升直径对揭示过冷流动沸腾的传热机理至关重要。为探究流动工况对气泡浮升直径的影响机制,针对发动机缸盖沸腾区域的冷却通道设计了一个水动力相似的矩形实验通道,搭建了过冷流动沸腾可视化实验循环系统。基于该可视化实验系统,研究了系统压力、壁面过热度、流速以及液体过冷度对气泡浮升直径的影响,发现气泡浮升直径随着系统压力、流速以及过冷度的增大而变小,随着壁面过热度的增大而增大。建立了气泡在浮升时刻的力平衡模型,该力平衡模型的预测值与实验值的平均相对误差为12.25%。为了便于工程应用,基于气泡浮升直径的力平衡模型,建立了气泡浮升直径的经验模型,该经验模型的预测值与实验值的平均相对误差为6.80%。
The research on the bubble lift-off diameter is very important to reveal the heat transfer mechanism of subcooling flow boiling.Aiming at the cooling channel in the boiling area of the engine cylinder head,a rectangular experimental channel with similar hydrodynamics was designed,and a visualized experimental circulation system for supercooled flow boiling was built.To explore the influence mechanism of flow condition on the bubble lift-off diameter,an experiment was carried out by using a high-speed camera to closely observe the bubble behaviors on a horizontal aluminum heating surface under high mass flux.The influence of system pressure,wall superheat,flow velocity and liquid supercooling on the bubble lift-off diameter were studied.It was found that the bubble lift-off diameter decreased with the increase of system pressure,flow rate and subcooling degree,and increased with the increase of wall superheat.In this paper,a force balance model was established for bubble lift-off diameter.The average relative error between the predicted value of the force balance model and the experimental value was 12.25%.In order to facilitate the application of engineering field,the empirical formula of bubble lift-off diameter is established based on force balance model.The empirical formula considered more comprehensive factors and predicted the bubble lift-off diameter with an average relative error of 6.80%.
作者
周培
张秀平
唐景春
杨磊
叶斌
黄荣华
ZHOU Pei;ZHANG Xiuping;TANG Jingchun;YANG Lei;YE Bin;HUANG Ronghua(School of Automotive and Transportation Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;State Key Laboratory of Compressor Technology(Anhui Laboratory of Compressor Technology),Hefei 230031,Anhui,China;School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2022年第1期194-203,共10页
CIESC Journal
基金
压缩机技术国家重点实验室(压缩机技术安徽省实验室)开放基金项目(SKL-YSJ201914)
中央高校基本科研业务费专项资金(JZ2021HGTA0150,JZ2021HGQA0239)。
关键词
气泡
气液两相流
模型
气泡浮升直径
过冷流动沸腾
bubble
gas-liquid flow
model
bubble lift-off diameter
subcooled flow boiling
