TITLE:
Effect of Viscosity on Pumping-Up of Newtonian Fluid Driven by a Rotating Cone
AUTHORS:
Takahiro Adachi, Yutaro Takahashi, Takeshi Akinaga, Junnosuke Okajima
KEYWORDS:
Newtonian Fluid, High Viscosity, Rotating Cone, Pumping-Up, Atomization
JOURNAL NAME:
Journal of Flow Control, Measurement & Visualization,
Vol.6 No.2,
April
12,
2018
ABSTRACT: Effect of viscosity on flow patterns of pumping-up of liquid generated by a cone rotating at the liquid surface has been experimentally studied with various concentrations of glycerol aqueous solution. We have previously found that the higher viscous non-Newtonian fluid was lifted-up along the conical surface with a radial filament-wise pattern, which is quite different from the monotonic thin film-wise pattern observed for the lower viscous fluid such as water. In order to elucidate the pumping-up mechanism, a transition diagram indicating the critical rotation rate is obtained as a function of viscosityof Newtonian fluid in this study, varying from the lower value of water (μ=0.890 mPa·s) to the higher one of glycerin (μ= 910mPa·s). It is found that there are three categories depending on the viscosity classified as1) film-wise pumping-up region for the viscosityμ≤134mPa·s,2) filament-wise pumping-up one for the viscosityμ≥520mPa·s, and3) no pumping-up phenomenon occursfor 134μmPa·s.