https://scholars.lib.ntu.edu.tw/handle/123456789/408257
標題: | Spreading of completely wetting, non-Newtonian fluids with non-power-law rheology | 作者: | Min Q. Duan Y.-Y. Wang X.-D. Liang Z.-P. Lee D.-J. Su A. |
關鍵字: | Contact angle;Non-power-law;Power exponent;Spreading;Spreading exponent | 公開日期: | 2010 | 卷: | 348 | 期: | 1 | 起(迄)頁: | 250-254 | 來源出版物: | Journal of Colloid and Interface Science | 摘要: | Spreading non-Newtonian liquids with non-power-law rheology on completely wetting surfaces are seldom investigated. This study assessed the wetting behavior of polydimethylsiloxane (PDMS), a Newtonian fluid, two carboxymethylcellulose (CMC) sodium solutions, a PDMS+2%w/w silica nanoparticle suspension and three polyethylene glycol (PEG400)+5-10%w/w silica nanoparticle suspensions (non-power-law fluids) on a mica surface. The θ D -U and R-t data for spreading drops of the six tested, non-power-law fluids can be described by power-law wetting models. We propose that this behavior is attributable to a uniform shear rate (a few tens to a few hundreds of s -1 ) distributed over the thin-film regime that controls spreading dynamics. Estimated film thickness was below the resolution of an optical microscope for direct observation. Approximating a general non-Newtonian fluid spreading as a power-law fluid greatly simplifies theoretical analysis and data interpretation. ? 2010 Elsevier Inc. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408257 | ISSN: | 00219797 | DOI: | 10.1016/j.jcis.2010.04.010 |
顯示於: | 化學工程學系 |
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