DROPLET IMPINGEMENT OF NANOPARTICLE SUSPENSIONS ON SOLID SURFACE
Spreading characteristics of nanofluid droplets impinging on aluminum substrate surface under the influence of the surface temperature and nanoparticles volume fraction are investigated. Sample nanofluid is prepared by dispersing several volumetric concentrations of titanium dioxide nanoparticles in ethylene glycol. The entire dynamic process starting from the moment of collision of droplet with the substrate surface to complete deposition is recorded using a high speed camera. Experiments are characterized using transient nondimensional spreading diameter and height of nanofluid droplets for various surface temperature and volume fractions of nanoparticles. The spreading of nanofluid droplets at higher volume fraction are found to be larger compared to those at lower volume fractions. Nanofluid with higher concentration of nanoparticles has larger kinetic energy than that of the lower volume fractionednanofluids and thus can enhance the spreading of droplet. With increasing substrate temperature the overall spreading diameter and height of nanofluid droplets significantly decrease and increase, respectively. Present results demonstrate that nanofluid droplet dynamic on solid surface is greatly influenced by the surface temperature as well as nanoparticles volume fraction.
S M Sohel Murshed C A Nieto de Castro
Centre for Molecular Sciences and Materials Faculty of Sciences, University of Lisbon Campo Grande, 1749-016 Lisboa, Portugal
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
681-685
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）