Abstract
The flow and heat-transfer characteristics over a continuously moving horizontal material with suction or injection are studied very close and far away downstream from the extrusion slit. The finite-volume method is used to map out the solutions in the nonsimilar and similar regions subject to uniform surface velocity and temperature. The effects of Prandtl number (
Pr), suction/injection parameter (
d) and Reynolds number (
Re
x
) on the friction and heat-transfer coefficients are studied. Comparisons with the similarity method solutions downstream at high
Re
x
are made. Critical Reynolds numbers to distinguish between the self-similar and nonsimilar regions are obtained. The region very close to the slit is characterized by: (i) a rapid increase in skin-friction coefficient with increasing suction, or with increasing injection above
d
≈
0.45; the lowest friction coefficient is attained at an injection parameter
d
≈
0.45, and (ii) large heat-transfer coefficient which increases with increasing Prandtl number and suction, and decreases with increasing injection. On the other hand, downstream where the similarity solution is valid both the skin-friction and heat-transfer coefficients reach asymptotic values depending on
d and, for the latter, on
Pr.