Extensional flow of low-viscosity fluids in capillary bridges formed by pulsed surface acoustic wave jetting

被引:36
作者
Bhattacharjee, P. K.
McDonnell, A. G.
Prabhakar, R.
Yeo, L. Y.
Friend, J. [1 ]
机构
[1] Monash Univ, MicroNanophys Res Lab, Dept Mech & Aerosp Engn, Melbourne, Vic 3800, Australia
关键词
RHEOLOGICAL PROPERTIES; POLYMER-SOLUTIONS; BREAKUP; FIBRINOGEN; TIME; RHEOMETRY; DYNAMICS; MOLECULE; TENSION;
D O I
10.1088/1367-2630/13/2/023005
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Forming capillary bridges of low-viscosity (less than or similar to 10 mPa s) fluids is difficult, making the study of their capillary-thinning behavior and the measurement of the fluid's extensional viscosity difficult as well. Current techniques require some time to form a liquid bridge from the stretching of a droplet. Rapidly stretching a liquid bridge using these methods can cause its breakup if the viscosity is too low. Stretching more slowly allows the bridge to thin and break up before a suitable bridge geometry can be established to provide reliable and accurate rheological data. Using a pulsed surface acoustic wave to eject a jet from a sessile droplet, a capillary bridge may be formed in about 7.5 ms, about seven times quicker than current methods. With this approach, capillary bridges may be formed from Newtonian and non-Newtonian fluids having much lower viscosities-water, 0.04% by weight solution of high-molecular-weight (7 MDa) polystyrene in dioctyl phthalate and 0.25% fibrinogen solution in demineralized water, for example. Details of the relatively simple system used to achieve these results are provided, as are experimental results indicating deviations from a Newtonian response by the low-viscosity non-Newtonian fluids used in our study.
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页数:14
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