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- 저자 : ( Yuan-ping Huo ) (검색결과 1 건)
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Experimental study of nanofluid droplet spreading on a solid substrate
( Hai Long Liu ),( Rui Wang ),( Yuan-ping Huo ),( Jun-feng Wang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
The nanofluid is a class of fluids with high thermal conductivity and non-Newtonian flow behaviors. The spreading characteristics of a nanofluid droplet impinging on the solid surface are the key factors to efficient heat and mass transfer in related processes by the deposition of droplets. In this study, three stable nanofluids (with carbon nanotubes, graphene, nano-graphite powder) were prepared by two-step method. The shear-dependent viscosity of these nanofluids have been studied experimentally. Furthermore, we investigated the evolution morphology of the droplet during the spreading process under various Weber numbers (We) by means of high-speed camera visualization technique. Based on the image processing technique (LB-ADSA), the dynamic contact angle (DCA), rebounding height and spreading factor of the droplet have been obtained along with spreading time. The experimental results show that the degrees of shear thinning in nanofluids are dissimilar and thus influence the spreading behaviors of nanofluid droplet. Specifically, the shear thinning behaviors suppress the spreading and rebounding stage of droplets. This suppression in nanofluid with large infinite shear viscosity are more prominent.
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