전단희석 액적의 건조 벽면 충돌 후 전개-수축 거동의 관찰 Examination of Spread-Recoil Behavior of a Shear-thinning Liquid Drop on a Dry Wall

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In the present study, spread-recoil behavior of a drop of shear-thinning liquid (xanthan solution) on a dry wall (polished stainless-steel plate) was examined and compared with that of Newtonian liquid (glycerin solution). Nine different kinds of xanthan and glycerin solutions were tested, including three pairs of xanthan and glycerin solutions, each having the same viscosity in low shear rate region (10⁻² – 10⁰ 1/s). The drop behavior was visualized and recorded using a CCD camera. The maximum diameter and the spreading velocity of the xanthan drops turned out to be significantly larger and the time to reach their final shape was much shorter compared to the cases with the glycerin solutions, due to the smaller viscous dissipation resulted from lower viscosity in the higher shear rate region (>10⁰ 1/s). As a result, the maximum diameters were measured to be larger than the predicted values based on the model proposed for Newtonian liquids, and the deviation was more pronounced with the solution with the larger viscosity variation. Consequently, viscosity variation with the shear rate was found to be a dominant factor governing the spread-recoil behavior of shear-thinning drops.
Publisher
한국액체미립화학회
Issue Date
2009-09
Language
Korean
Citation

한국액체미립화 학회지, v.14, no.3, pp.131 - 138

ISSN
1226-2277
URI
http://hdl.handle.net/10203/96447
Appears in Collection
ME-Journal Papers(저널논문)
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