Mass transfer in SiO₂ nanofluids: A case against purported nanoparticle convection effects

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• 作者：Xuemei Feng ; Drew W. Johnson ; ^{Drew.Johnson@UTSA.edu}
• 关键词：Nanofluids ; Mass transfer ; Brownian motion
• 刊名：International Journal of Heat and Mass Transfer
• 出版年：2012
• 期刊代码：42_00179310
• 类别：ce
• 出版时间：June, 2012
• 卷：55
• 期：13-14
• 页码：3447-3453
• 文件大小：408 K

摘要

Controversy and the ambiguity exist in the scientific literature for the question of if nanoparticles truly enhance heat and mass transfer. This study experimentally explored effects of non-aggregating spherical SiO₂ nanoparticles on oxygen and NaCl mass transfer. No mass transfer enhancements were found in the presence of nanoparticles. Oxygen transfer was actually diminished at the highest nanoparticle volume fraction; this is attributed to solution viscosity effects and the obstruction effects of impermeable nanoparticles. No evidence was found to substantiate the purported Brownian motion micro/nano-scale convection effect of nanoparticles that has been used by others to explain anomalous heat and mass transfer rates in nanofluids.