Author(s)

Takahiro Adachi^1*, Yutaro Takahashi¹, Takeshi Akinaga¹, Junnosuke Okajima²

¹Department of Systems Design Engineering, Akita University, Akita, Japan.
²Institute of Fluid Science, Tohoku University, Sendai, Japan.

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 viscosity of Newtonian fluid in this study, varying from the lower value of water (μ = 0.890 mPa·s) to the higher one of glycerin (μ = 910 mPa·s). It is found that there are three categories depending on the viscosity classified as 1) film-wise pumping-up region for the viscosity μ ≤ 134 mPa·s, 2) filament-wise pumping-up one for the viscosity μ ≥ 520 mPa·s, and 3) no pumping-up phenomenon occurs for 134 < μ < 520 mPa·s.

Newtonian Fluid, High Viscosity, Rotating Cone, Pumping-Up, Atomization

Adachi, T. , Takahashi, Y. , Akinaga, T. and Okajima, J. (2018) Effect of Viscosity on Pumping-Up of Newtonian Fluid Driven by a Rotating Cone. Journal of Flow Control, Measurement & Visualization, 6, 57-65. doi: 10.4236/jfcmv.2018.62006.