Effect of wetting surface on heat transfer characteristics of double bubbles at microscale
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.
lattice Boltzmannmixed wettabilitygrowth processheat transfer effectdeparture time
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