Detection of Nanoparticle Brownian Motions in a Nanofluid Using Laser Speckle Velocimetry

	Detection of Nanoparticle Brownian Motions in a Nanofluid Using Laser Speckle Velocimetry
	Ming Qian; Qin Yan; Xiaowu Ni; Hairong Zheng
刊名	LASERS IN ENGINEERING
	2010
卷号	20 期号:1-2 页码:117-128
英文摘要	Nanofluids have much higher thermal conductivity than traditional heat transfer fluids owning to the existence within them of nanoparticles, even at a low particle concentration. Brownian motions of nanoparticles may contribute to the thermal conductivity enhancement. In this paper the motions of nanoparticles in a ferro-nanofluid flow were investigated with the laser speckle velocimetry (LSV) technique. Speckle patterns of the nanofluid were recorded by a CCD camera and processed with a cross-correlation algorithm to obtain nanofluid flow vectors. According to the findings, the overall motion trend of nanoparticles was along the pipe flow direction. To a small extent, however, nanoparticle motion vectors deviated from the axial direction. Further average processing over multiple vector diagrams yielded flow vectors obeyed typical laminar flow profile, which means that the derivations in flow direction were random in nature, and resulted from Brownian motions of the nanoparticles. The study indicates that LSV could be a useful tool for visualizing nanofluid flow.
收录类别	SCI
原文出处	https://www.oldcitypublishing.com/LIE/LIEabstracts/LIE20.1-2abstracts/LIEv20n1-2p117-128Qian.html
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/2926]
专题	深圳先进技术研究院_医工所
作者单位	LASERS IN ENGINEERING
推荐引用方式 GB/T 7714	Ming Qian,Qin Yan,Xiaowu Ni,et al. Detection of Nanoparticle Brownian Motions in a Nanofluid Using Laser Speckle Velocimetry[J]. LASERS IN ENGINEERING,2010,20(1-2):117-128.
APA	Ming Qian,Qin Yan,Xiaowu Ni,&Hairong Zheng.(2010).Detection of Nanoparticle Brownian Motions in a Nanofluid Using Laser Speckle Velocimetry.LASERS IN ENGINEERING,20(1-2),117-128.
MLA	Ming Qian,et al."Detection of Nanoparticle Brownian Motions in a Nanofluid Using Laser Speckle Velocimetry".LASERS IN ENGINEERING 20.1-2(2010):117-128.