0
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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Schematic diagram of experimental setup

Grahic Jump Location
Fig. 2

Typical roughness geometry

Grahic Jump Location
Fig. 3

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

Grahic Jump Location
Fig. 4

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

Grahic Jump Location
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)

Grahic Jump Location
Fig. 6

Graphical representation of the flow field affected by present roughness geometry

Grahic Jump Location
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)

Grahic Jump Location
Fig. 8

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

Grahic Jump Location
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)

Grahic Jump Location
Fig. 10

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

Grahic Jump Location
Fig. 11

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

Grahic Jump Location
Fig. 12

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

Grahic Jump Location
Fig. 13

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

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In