Visualization of flow pattern and thermal image analysis of enhanced heat transfer surface

M. D. Islam, K. Oyakawa, I. Kubo

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Experimental studies on flow visualization and heat transfer measurements of finned surface in a narrow duct were carried out to understand the flow behavior and its effect on heat transfer. In this experiment, short rectangular fins were attached to a surface (endwall) with having inclination angle of 20° and exposed to air flow. Several flow visualization results reveal that horse shoe vortex was formed just at the front of the fin whereas the main longitudinal vortex was formed by the side top edge of the fin. Some important features of the vortex structure, size and flow reattachment positions were noticed from the smoke flow visualization. Detailed heat transfer distributions were discussed from the thermal image. Nusselt number shows that the finned surface achieved average heat transfer enhancement at a factor of four times than that of without fins.

Original languageBritish English
Pages (from-to)511-517
Number of pages7
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
Volume45
Issue number4
DOIs
StatePublished - Feb 2009

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