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Research Papers

Performance Investigation of a Triangular Solar Air Heater Duct Having Broken Inclined Roughness Using Computational Fluid Dynamics

[+] Author and Article Information
Sheetal Kumar Jain

Department of Mechanical Engineering,
Malaviya National Institute of Technology,
Jaipur 302017, India
e-mails: 2016rme9522@mnit.ac.in; sheetaljain91@gmail.com

Ghanshyam Das Agrawal

Department of Mechanical Engineering,
Malaviya National Institute of Technology,
Jaipur 302019, India
e-mail: gdagrawal2@gmail.com

Rohit Misra

Department of Mechanical Engineering,
Government Engineering College,
Ajmer 305002, India
e-mail: rohiteca@rediffmail.com

Prateek Verma

Department of Mechanical Engineering,
Government Engineering College,
Ajmer 305002, India
e-mail: prateek.ver24@gmail.com

Sanjay Rathore

Department of Mechanical Engineering,
Government Engineering College,
Ajmer 305002, India
e-mail: rathoresanjay1810@gmail.com

Doraj Kamal Jamuwa

Department of Mechanical Engineering,
Government Engineering College,
Ajmer 305002, India
e-mail: kdoraj@yahoo.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering: Including Wind Energy and Building Energy Conservation. Manuscript received February 22, 2019; final manuscript received May 6, 2019; published online May 28, 2019. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 141(6), 061008 (May 28, 2019) (11 pages) Paper No: SOL-19-1068; doi: 10.1115/1.4043751 History: Received February 22, 2019; Accepted May 10, 2019

Large-scale adaptation of solar air heating in industries and agro-processing will lead to clean energy processing as well as reducing the production cost for these industries. The solar air heater uses the principle of the greenhouse effect to heat air through the collected heat in the absorber. Among the various techniques employed by the researchers to augment heat transfer, the addition of artificial roughness elements/fins/corrugations on the heated surface is the promising one for heat transfer augmentation. In the present work, the effect of broken inclined ribs with rectangular cross-section on heat transfer and friction characteristics of the equilateral triangular passage duct has been analyzed using computational fluid dynamics. The effect of roughness parameters, viz., relative gap position and relative gap width, is being investigated for the Reynolds number (Re) ranging from 4000 to 18,000. The values of relative gap position (d/W) and relative gap width (g/e) are varied from 0.16 to 0.67 and 0.5 to 2, respectively, while a constant heat flux is supplied on the absorber side, other surfaces being insulated. The Nusselt number increased up to 2.16 times by using broken ribs than that of the smooth duct at d/W = 0.25 and g/e = 1.

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References

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Figures

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Fig. 1

Absorber plate roughened with broken inclined ribs

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Fig. 2

Roughness pattern of broken inclined ribs

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Fig. 5

Variation of Nusselt number with Reynolds number for different values of the relative gap position (d/W)

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Fig. 6

Variation of Nusselt number as a function of the relative gap position (d/W) for different values of Reynolds number

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Fig. 7

(a) Flow pattern for the continuous rib, (b) flow pattern for the broken rib, and (c) representation of velocity vectors for broken inclined ribs

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Fig. 8

Variation of Nusselt number as a function of relative gap width (g/e) for different values of Reynolds number

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Fig. 9

Variation of friction factor as a function of relative gap position (g/e) for different values of Reynolds number

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Fig. 10

Variation of the friction factor as a function of relative gap width (g/e) for different values of Reynolds number

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Fig. 11

Variation of the thermo-hydraulic performance parameter with Reynolds number for various relative gap position values

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Fig. 12

Variation of the thermo-hydraulic performance parameter with Reynolds number for various relative gap width values

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Fig. 13

Variation of Nusselt number with Reynolds number

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Fig. 14

Plot of ln(Nu/Re0.7775) versus ln(d/W)

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Fig. 15

Plot of ln(Nu/Re0.7775*(d/W)−0.0728exp(−0.0082ln (d/W)2))) versus ln(g/e)

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Fig. 19

Comparison of numerical and predicted values of the (a) Nusselt number and (b) the friction factor

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