Generation of shear waves and their flow fields by a moving body in a viscoelastic fluid

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05784
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Chiba University
• Principal Investigator: MIKAMI Fumihiko 千葉大学, 大学院工学研究院, 准教授 (40272348)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 流体力学 / 粘弾性流体 / 波動 / 粘弾性マッハ数 / 流体力 / 特性曲線 / マッハコーン

Outline of Final Research Achievements

Shear waves, or transverse waves, can be propagated in viscoelastic fluids. Since the shear wave speed is slower in dilute solutions, the speed of an object through a fluid sometimes exceeds the speed of shear waves in the fluid. It is demonstrated from the experiments with some of the viscoelastic fluids showing significant shear wave propagation, that this leads to a significant change in the flow field of viscoelastic fluids including the formation of Mach cones around a falling sphere. The results suggest the importance of considering viscoelastic Mach numbers that facilitates the understanding of a complex phenomenon associated with viscoelastic fluid flow.

Free Research Field

流体力学