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

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

doi:10.1007/s00231-008-0448-7

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

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

Mechanical & Nuclear Engineering

University of the Ryukyus

Research output: Contribution to journal › Article › peer-review

21 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 language	British English
Pages (from-to)	511-517
Number of pages	7
Journal	Heat and Mass Transfer/Waerme- und Stoffuebertragung
Volume	45
Issue number	4
DOIs	https://doi.org/10.1007/s00231-008-0448-7
State	Published - Feb 2009

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title = "Visualization of flow pattern and thermal image analysis of enhanced heat transfer surface",

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.",

author = "Islam, \{M. D.\} and K. Oyakawa and I. Kubo",

note = "Funding Information: This research work is partially supported by Heiwa Nakajima Foundation, Tokyo, Japan. This support is gratefully acknowledged. The authors are also grateful to The Petroleum Institute, Abu Dhabi, UAE for their present financial and technical support.",

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T1 - Visualization of flow pattern and thermal image analysis of enhanced heat transfer surface

AU - Islam, M. D.

AU - Oyakawa, K.

AU - Kubo, I.

N1 - Funding Information: This research work is partially supported by Heiwa Nakajima Foundation, Tokyo, Japan. This support is gratefully acknowledged. The authors are also grateful to The Petroleum Institute, Abu Dhabi, UAE for their present financial and technical support.

PY - 2009/2

Y1 - 2009/2

N2 - 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.

AB - 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.

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

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