Effect of Viscosity on Pumping-Up of Newtonian Fluid Driven by a Rotating Cone

• 作者: Junnosuke Okajima Takahiro Adachi Takeshi Akinaga Yutaro Takahashi
• 来源期刊: 流量控制、测量及可视化(英文)
• 学科: 医学
• 关键词: Newtonian Fluid High VISCOSITY ROTATING CONE Pumping-Up Atomization
• 年，卷（期）: llkzcljkshyw,（2）
• 页码范围: 57-65
• 页数: 9页
• 分类号: R73

摘要

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??mPa·s.