EFFECTS OF HYDROPHOBIC SURFACE NANOBUBBLES ON THE FLOW IN NANOCHANNELS

2011 ◽  
Vol 25 (10) ◽  
pp. 773-780 ◽  
Author(s):  
HUI XIE ◽  
CHAO LIU
Keyword(s):  
Molecular Dynamics ◽  
Fluid Flow ◽  
Molecular Dynamics Simulation ◽  
Velocity Slip ◽  
Hydrophobic Surface ◽  
Dynamics Simulation ◽  
Attractive Force

It has been demonstrated that there are nanobubbles on hydrophobic surface. Molecular dynamics simulation was adopted to investigate the impacts of the hydrophobic surface nanobubbles on fluid flow in nanochannel. A method for calculating the velocity of nanobubbles is presented. The results show that the bubbles on two plates enhance the velocity slip and disturb the flow. The behavior is attributed to the attractive force between nanobubbles.

Molecular Dynamics Simulation of Boiling Behavior of Nanofluid With Various Wettability Nanoparticle on Hydrophobic Surface

2019 ◽  
Author(s):  
Xunyan Yin ◽  
Minli Bai ◽  
Chengzhi Hu ◽  
Jizu Lv ◽  
Yubai Li
Keyword(s):  
Heat Transfer ◽  
Molecular Dynamics ◽  
Heat Flux ◽  
Molecular Dynamics Simulation ◽  
Base Fluid ◽  
Hydrophobic Surface ◽  
Surface Wettability ◽  
Dynamics Simulation ◽  
Evaporation Number

Abstract Molecular dynamics simulation is performed to investigate the rapid boiling of nanofluid with the variation nanoparticle wettabilities above hydrophobic surface. Four fluids are selected: base fluid (fluid 1), nanofluid with nanoparticle wettability less than (fluid 2), equal tofluid 3) and greater than (fluid 4) surface wettability. It should be noted that nanoparticle is deposited on the surface in this paper. Results show that nanofluid responds rapid boiling faster than base fluid. For fluid 4, the efficiency in heat transfer is enhanced due to the improvement of surface wettability. While for fluid 2 and 3, the surface wettability is deteriorated by the depositional nanoparticle. The heat flux is strengthened, but argon temperature and evaporation number reduce, and thus fluid 2 and 3 are not beneficial for heat transfer.

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