Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater

A. Chaube, P.K. Sahoo, S.C. Solanki

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

A computational analysis of heat transfer augmentation and flow characteristics due to artificial roughness in the form of ribs on a broad, heated wall of a rectangular duct for turbulent flow (Reynolds number range 3000-20,000, which is relevant in solar air heater) has been carried out. Shear stress transport k-ω turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. A detailed analysis of heat transfer variation within inter rib region is done by using the selected turbulence model. The analysis shows that peak in local heat transfer coefficient occurs at the point of reattachment of the separated flow as observed experimentally. The results predict a significant enhancement of heat transfer in comparison to that for a smooth surface. There is a good matching between the predictions by SST k-ω and experimental results. In this work, nine different shapes of rib are examined using SST k-ω model and compared on the basis of heat transfer enhancement, friction characteristics and performance index considering heat transfer enhancement with the same pumping power. © 2005 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)317-331
Number of pages15
JournalRenewable Energy
Volume31
Issue number3
DOIs
Publication statusPublished - 2006

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Surface roughness
Heat transfer
Air
Turbulence models
Ducts
Heat transfer coefficients
Turbulent flow
Shear stress
Reynolds number
Friction

Cite this

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title = "Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater",
abstract = "A computational analysis of heat transfer augmentation and flow characteristics due to artificial roughness in the form of ribs on a broad, heated wall of a rectangular duct for turbulent flow (Reynolds number range 3000-20,000, which is relevant in solar air heater) has been carried out. Shear stress transport k-ω turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. A detailed analysis of heat transfer variation within inter rib region is done by using the selected turbulence model. The analysis shows that peak in local heat transfer coefficient occurs at the point of reattachment of the separated flow as observed experimentally. The results predict a significant enhancement of heat transfer in comparison to that for a smooth surface. There is a good matching between the predictions by SST k-ω and experimental results. In this work, nine different shapes of rib are examined using SST k-ω model and compared on the basis of heat transfer enhancement, friction characteristics and performance index considering heat transfer enhancement with the same pumping power. {\circledC} 2005 Elsevier Ltd. All rights reserved.",
author = "A. Chaube and P.K. Sahoo and S.C. Solanki",
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Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater. / Chaube, A.; Sahoo, P.K.; Solanki, S.C.

In: Renewable Energy, Vol. 31, No. 3, 2006, p. 317-331.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater

AU - Chaube, A.

AU - Sahoo, P.K.

AU - Solanki, S.C.

N1 - Cited By :104 Export Date: 19 June 2018

PY - 2006

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N2 - A computational analysis of heat transfer augmentation and flow characteristics due to artificial roughness in the form of ribs on a broad, heated wall of a rectangular duct for turbulent flow (Reynolds number range 3000-20,000, which is relevant in solar air heater) has been carried out. Shear stress transport k-ω turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. A detailed analysis of heat transfer variation within inter rib region is done by using the selected turbulence model. The analysis shows that peak in local heat transfer coefficient occurs at the point of reattachment of the separated flow as observed experimentally. The results predict a significant enhancement of heat transfer in comparison to that for a smooth surface. There is a good matching between the predictions by SST k-ω and experimental results. In this work, nine different shapes of rib are examined using SST k-ω model and compared on the basis of heat transfer enhancement, friction characteristics and performance index considering heat transfer enhancement with the same pumping power. © 2005 Elsevier Ltd. All rights reserved.

AB - A computational analysis of heat transfer augmentation and flow characteristics due to artificial roughness in the form of ribs on a broad, heated wall of a rectangular duct for turbulent flow (Reynolds number range 3000-20,000, which is relevant in solar air heater) has been carried out. Shear stress transport k-ω turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. A detailed analysis of heat transfer variation within inter rib region is done by using the selected turbulence model. The analysis shows that peak in local heat transfer coefficient occurs at the point of reattachment of the separated flow as observed experimentally. The results predict a significant enhancement of heat transfer in comparison to that for a smooth surface. There is a good matching between the predictions by SST k-ω and experimental results. In this work, nine different shapes of rib are examined using SST k-ω model and compared on the basis of heat transfer enhancement, friction characteristics and performance index considering heat transfer enhancement with the same pumping power. © 2005 Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.renene.2005.01.012

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