Experimental and numerical simulation study of dynamics of nanofluid droplet impact on solid surfaces

doi:10.7523/j.issn.2095-6134.2020.02.020

Abstract

Abstract: The phenomena of droplet impacting on solid surfaces widely occur in engineering fields such as the power machinery, spray cooling, and coating. The homogeneous and stable nanofluids were prepared by dispersing graphene and MWCNT to epoxy resin using ultrasound technique. The impacting process of droplet on solid surface was investigated by means of high-speed camera technique. Simulations of droplet impacting on surfaces were carried out by employing the finite element scheme. The level-set method was used to capture the interface movement and a modified power-law model was used to characterize the effect of nanoparticle additives. Simulations showed that the results were in reasonably good agreement with the experimental data. The experimental results showed that the nanoparticle additives brought shear-thinning properties to base fluids and suppressed the spreading behaviors of droplet. The simulation results revealed that with the decrease of the power law index m, the range of variation during the droplet spreading process became significantly large. With the increase of the surface tension, there was no significant change in the dimensionless diameter during the spreading phase, while during the receding phase the dimensionless diameter of droplet decreased gradually.

Key words: nanofluid, non-Newtonian property, droplet, impact dynamics, level-set method

CLC Number:

O359

WANG Rui, SHEN Xuefeng, HUO Yuanping, WANG Junfeng, ZHENG Nuo, LIU Hailong. Experimental and numerical simulation study of dynamics of nanofluid droplet impact on solid surfaces[J]. , 2020, 37(2): 281-287.

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