微尺度下润湿性表面对双气泡传热特性的影响
Effect of wetting surface on heat transfer characteristics of double bubbles at microscale
战洪仁 1纪柏辰 1刘东灵 1刘德彬 1张先珍 1李帅1
作者信息
- 1. 沈阳化工大学机械与动力工程学院,辽宁沈阳 110142
- 折叠
摘要
为探究混合润湿表面双气泡生长过程的特点和传热特性,利用格子Boltzmann方法研究混合润湿性表面不同因素对生长和传热过程的影响规律.结果表明:对于纯润湿性表面,随着润湿性的降低,气泡成核时间减少,气泡脱离表面时间呈增加趋势,双气泡生长过程的平均热流密度呈减少趋势.混合表面可以实现相比纯润湿性表面更高的脱离频率和更好的换热效果,混合润湿表面整体脱离频率在(Lq/Δx)＞0.37(Δx＜30)时呈增加趋势,在(Lq/Δx)≤0.37(Δx≥30)时呈降低趋势;同一距离Lq/Δx不同疏水尺寸的脱离频率在(Lq/Δx)＞0.37(Δx＜30)时呈先降低后增加趋势,在(Lq/Δx)≤0.37(Δx≥30)时呈增加趋势;同一距离Lq/Δx不同疏水尺寸的平均热流密度在(Lq/Δx)＞0.37(Δx＜30)时呈降低趋势,Ls=3(Ls/Lq=0.27)是最佳换热尺寸,在(Lq/Δx)≤0.37(Δx≥30)时呈先增加后降低趋势,Ls=5(Ls//Lq=0.45)为最佳换热尺寸.
Abstract
In order to explore the characteristics and heat transfer characteristics of double bubble growth on mixed wetting surface,the lattice Boltzmann method was used to study the effects of different factors on mixed wettability surface on growth and heat transfer process.The results indicate that for pure wettable surfaces,as the wettability decreases,the nucleation time of bubbles decreases,and the detachment time of bubbles from the surface increases.The average heat flux density of the double bubbles growth processes decreases.Mixed surfaces can achieve higher detachment frequency and better heat transfer effect compared to pure wetting surfaces.The overall detachment frequency of mixed wetting surfaces increases at(Lq/Δx)＞0.37(Δx＜30)and decreases at(Lq/Δx)≤0.37(Δx ≥30).The detachment frequency of different hydrophobic sizes at the same distance Lq/Δx decreases first and then increases at(Lq/Δx)＞0.37(Δx＜30),and increases at(Lq/Δx)≤0.37(Δx≥30).The average heat flux density of different hydrophobic sizes at the same distance Lq/Δx shows a decreasing trend at Lq/Δx＞0.37(Δx＜30),with Ls=3(Ls/Lq=0.27)being the optimal heat transfer size,increasing first and then decreasing at(Lq/Δx)≤0.37(Δx≥30),and Ls=5(Ls/Lq=0.45)being the optimal heat transfer size.
关键词
格子Boltzmann/混合润湿性/生长过程/换热效果/脱离时间Key words
lattice Boltzmann/mixed wettability/growth process/heat transfer effect/departure time引用本文复制引用
基金项目
国家自然科学基金(61473056)
辽宁省教育厅高等学校科研项目(LJ2020017)
出版年
2024
国家科技期刊平台
NSTL
万方数据