Local Heat Transfer Distribution on a Rough Flat Plate Impinged by a Slot Jet

ABSTRACT

An experimental investigation on local heat transfer distribution on a rib roughened surface impinged by a normal slot jet is carried out with attached and detached ribs. Influence of rib pitch to rib height ratio (p/e), rib height to slot width ratio (e/b) and rib width to slot width ratio (w/b) on the fluid flow and heat transfer distribution are studied for attached rib configuration. The effect of clearance ratio (c/e) is studied for detached rib configuration. Study has been carried out by impinging the jet over the rib and the cavity center for both attached and detached rib configurations. A single slot jet with an aspect ratio (l/b) of about 50 is chosen. Reynolds number is varied from 4200 to 12000 and jet-to-plate spacing (z/b) is varied from 0.5 to 12. The local heat transfer distribution is estimated from the images of infra-red thermal imaging camera. Flow field measurements are measured using hot wire anemometer at a Reynolds number of 12000. It has been observed that the enhancement of Nusselt number with attached ribs and uniform distribution of Nusselt number with detached ribs.

---

Full Text (PDF)

© 2010 Research Publishing Services