EXPERIMENTAL INVESTIGATION OF FLOW AND HEAT TRANSFER OVER A CURVED SURFACE

Abstract

The object of the present work, in this thesis, is to give a clear picture of the flow characteristics over a curved surface. For that a convex-concave curved surface is designed and manufactured according to the following equation

Z/H = l-0.08 (x/H)9 + 0.024 (x/H)4 - 0.00192 (X/H)

The wind tunnel facility in Aerodynamics

laboratory at

EL-Minia University is adopted. A special Dual probe is designed and constructed to measure

port the

pressure time mean

velocity. Also a traversing mechanism is made to hold the probe in a position perpendicular to the curved surface.

Measurements of mean velocity of an flow through a convex - concave curved tangent are reported. The influence of

incompressible surface with three Reynolds

turbulent downstream numbers on

the velocity distribution (2.618xl0 , 3.927 xlO and

4.096xl0 )

is studied. The results indicate that as Reynolds number

increases the maximum velocity increases The velocity distribution is found to be surface in compar1son with that over the

over the curved surface. uniform over the concave . convex surface.

Also an experimental study of the effect of different curved surface temperature on the velocity and temperature distributions over the curved surface is reported at Re = 2.28lx10 . It is found that increasing the curved surface temperature leads to increase the maximum velocity. The rate of development 1n temperature distribution is much better in convex surface in comparison with that found over a concave surface.