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

作　　者：战洪仁[1] 纪柏辰 刘东灵 刘德彬 张先珍[1] 李帅[1] ZHAN Hongren;JI Baichen;LIU Dongling;LIU Debin;ZHANG Xianzhen;LI Shuai(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning Province,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142

出　　处：《化学工程》2024年第5期13-18,38,共7页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(61473056);辽宁省教育厅高校科研基金资助项目(LJ2020017)。

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(L_(q)/△x)>0.37(△x<30)时呈增加趋势,在(L_(q)/△x)≤0.37(△x≥30)时呈降低趋势;同一距离L_(q)/△x不同疏水尺寸的脱离频率在(L_(q)/△x)>0.37(△x<30)时呈先降低后增加趋势,在(L_(q)/△x)≤0.37(△x≥30)时呈增加趋势;同一距离L_(q)/△x不同疏水尺寸的平均热流密度在(L_(q)/△x)>0.37(△x<30)时呈降低趋势,L_(s)=3(L_(s)/L_(q)=0.27)是最佳换热尺寸,在(L_(q)/△x)≤0.37(△x≥30)时呈先增加后降低趋势,L_(s)=5(L_(s)/L_(q)=0.45)为最佳换热尺寸。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(L_(q)/△x)>0.37(△x<30)and decreases at(L_(q)/△x)≤0.37(△x≥30).The detachment frequency of different hydrophobic sizes at the same distance L_(q)/△x decreases first and then increases at(L_(q)/△x)>0.37(△x<30),and increases at(L_(q)/△x)≤0.37(△x≥30).The average heat flux density of different hydrophobic sizes at the same distance L_(q)/△x shows a decreasing trend at L_(q)/△x>0.37(△x<30),with L_(s)=3(L_(s)/L_(q)=0.27)being the optimal heat transfer size,increasing first and then decreasing at(L_(q)/△x)≤0.37(△x≥30),and L_(s)=5(L_(s)/L_(q)=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 

分 类 号：TK124[动力工程及工程热物理—工程热物理]