Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Drag coefficient

Experimental Determination of Drag Coefficient on Different Automobiles Geometry

Abdulhassan A.Karamallah; Abdessamed Kacem Wahab

Engineering and Technology Journal, 2011, Volume 29, Issue 15, Pages 3043-3057

The undertaken research deals with an experimental determination of drag
coefficient for five car models. Experiments were run within a subsonic aspiration wind tunnel, covering an air speed up to 33m/s.Drag coefficients of 0.45, 0.39, 0.53, 0.34 and 0.68 for Mercedes SEL300, Hyundai, Toyota, Pajero, and Mini-Bus models were obtained respectively.
The flow field around the pre-quoted models with a qualitative description about the flow visualization for car models using a subsonic smoke wind tunnel has been accomplished.

Experimental Investigation of The Steady Motion of Spherical- Cap Bubble

Hussein Ali Hussab; Mohsin Abbas Mashay

Engineering and Technology Journal, 2010, Volume 28, Issue 12, Pages 2325-2336

The aim of the present work is to study the hydrodynamics of sphericalcap
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 spherica–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.