Experimental Investigation of the Virtual Mass of Spherical- Cap Rigid Body

Abstract

The aim of the present work is to study the virtual mass (added mass) coefficients for spherical-cap bubbles were measured by using five different spherical-cap sizes made of steel. The bodies were suspended by a fine wire over an aluminum pulley to weights which provided the driving force. The time taken for the spherical-cap bodies to moving through different distances were measured with a stop-watch. The force balance of accelerated motion for spherical-cap bodies is investigated and added mass coefficient is measured. The added mass coefficient for spherical-cap bodies a simulation of spherical-cap bubbles with different wake angle (50,60.5,75,90,120) degree is (19.76,8.86,4.08,2.69,1.26) respectively. The experimental results are compared with the theoretical results from some investigators.