Experimental investigation of the steady motion of spherical-cap bubble

الملخص EN

The aim of the present work is to study the hydrodynamics of spherical cap bubble, rise bubble velocity, shape of bubble, and drag coefficient.

The experimental work of two-phase, air-water system was carried out using a Perspex column of 14.5 cm diameter and 180 cm height.

A known volume of air was supplied to the cup from a syringe.

The single gas bubble rose through the entrance region by turning the cup instantaneously.

The rise bubble velocity was measured by visual observation.

In order to measure the terminal velocity an electronic timer (Stop-Watch) was used.

The drag coefficient of air spherical–l cap bubble rising in water was measured and found to be a value between (2.8-3.8) for all Reynolds number.

The experimental results are compared with the theoretical results of some investigators.