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Research Papers

Experimental Investigation of Enhanced Heat Transfer and Pressure Drop in a Solar Air Heater Duct With Discretized Broken V-Rib Roughness

[+] Author and Article Information
Anil Kumar Patil

Associate Professor
Department of Mechanical Engineering,
Dehradun Institute of Technology,
Dehradun, Uttarakhand 248009, India
e-mail: akpt1711978@gmail.com

J. S. Saini, Krishna Kumar

Department of Mechanical Engineering,
Dehradun Institute of Technology,
Dehradun, Uttarakhand 248009, India

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 July 31, 2013; final manuscript received April 12, 2014; published online October 30, 2014. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 137(2), 021013 (Oct 30, 2014) (8 pages) Paper No: SOL-13-1214; doi: 10.1115/1.4028071 History: Received July 31, 2013; Revised April 12, 2014

The present study examines the augmentation in heat transfer and friction in a flow through solar air heater duct with discretized broken V-rib roughness. The experimental outcomes pertaining to Reynolds number from 3000 to 17,000, relative gap position (s′/s) from 0.2 to 0.8, relative staggered rib position (p′/p) from 0.2 to 0.8 have been presented and discussed. Discretized broken V-rib roughness brought out considerable enhancement in heat transfer rates over V-rib roughness and smooth duct. Effective efficiency of discretized broken V-rib roughened solar air heater is estimated and geometrical parameters of roughness are optimized with regard to temperature rise parameter and insolation.

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References

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Figures

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Fig. 1

Schematic diagram of experimental setup

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Fig. 2

Typical roughness geometry

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Fig. 3

Comparison of experimental and predicted values of Nusselt number for conventional smooth duct

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Fig. 4

Comparison of experimental and predicted values of friction factor for conventional smooth duct

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Fig. 5

Stanton number as a function of Reynolds number for different relative gap positions (s′/s) and different relative staggered rib positions (p′/p)

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Fig. 6

Graphical representation of the flow field affected by present roughness geometry

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Fig. 7

Stanton number enhancement ratio as a function of Reynolds number for different relative gap positions (s′/s) and different relative staggered rib positions (p′/p)

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Fig. 8

Stanton number enhancement ratio as a function of relative gap positions (s′/s) and relative staggered rib positions (p′/p)

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Fig. 9

Friction factor ratio as a function of Reynolds number for different relative gap positions (s′/s) and different relative staggered rib positions (p′/p)

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Fig. 10

Effective efficiency as a function of Reynolds number for different sets of roughness parameters

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Fig. 11

Effective efficiency as a function of temperature rise parameter for different sets of roughness parameters

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Fig. 12

Optimum values of relative staggered rib position as a function of temperature rise parameter and insolation

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Fig. 13

Optimum values of relative gap position as a function of temperature rise parameter and insolation

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