Noninvasive measurement and multiple-scale analysis of cavitation bubbles in viscoelastic materials

2016 Fiscal Year Final Research Report

• Project/Area Number: 25709008
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Keio University
• Principal Investigator: Ando Keita 慶應義塾大学, 理工学部, 講師 (30639018)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: キャビテーション / 気泡核 / 物質移動 / 気泡力学 / レーザー誘起衝撃波 / 粘弾性体

Outline of Final Research Achievements

An experimental technique in combination with numerical simulation was developed, which allows one to study multiple-scale characteristics in the dynamics of cavitation bubbles in viscoelastic materials. Micron-sized bubble nuclei were produced by focusing infrared laser pulses into gelatin gels and their size was precisely controlled through mass transfer of dissolved gases; the gel viscoelasticity was measured from microscopic observation of individual cavitation bubbles arising from these nuclei and its comparison to Rayleigh-Plesset-type calculation. Furthermore, a cloud of cavitation bubbles arising from shock-microbubble interaction in gelatin gels was visualized as macroscopic observation. The threshold pressure of the cloud cavitation inception was inferred from comparison of the experiment to compressible fluid flow simulation.

Free Research Field

熱流体工学