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Heat transfer and friction factor enhancement in a square channel having integral inclined discrete ribs on two opposite walls

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Abstract

The influence of a gap provided in integral inclined ribs on heat transfer and friction factor enhancement is investigated. Experiments are conducted to obtain heat transfer and friction factor characteristics in a square channel with two opposite in-line ribbed walls for Reynolds numbers from 5000 to 40000. The test section of square channel composed of integral inclined ribs with a gap and has a length-tohydraulic diameter ratio (L/D h ) of 20. The rib pitch-to-height ratio (p/e) is 10, the rib height-to-hydraulic diameter ratio (e/D h ) is 0.060 and rib attack angle (α) varies in the range of 300 to 900 (4 steps). The relative gap position (d/W) and relative gap width (g/e) is varied in the range of 1/5–2/3 (5 steps) and 0.5–2.0 (4 steps), respectively. The enhancement in heat transfer and friction factor of this roughened duct was compared with smooth duct and duct roughened with continuous inclined ribs (with no gap) under similar flow condition. Presence of inclined ribs with a gap yields about 4-fold enhancements in Nusselt number and about 8-fold increase in the friction factor compared with smooth duct and about 1.3 times and 1.4 times higher than the case of continuous ribs (without gaps) for the entire range of parameters investigated. Ribs with relative gap width of 1.0 at relative gap position of 1/3 and attack angle of 60° provides maximum heat transfer and friction factor enhancement.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Jabalpur Engineering College, Jabalpur, 482011, India

    Alok Chaube

  2. Department of Mechanical Engineering, Rajiv Gandhi Technological University, Bhopal, 462036, India

    Shailesh Gupta

  3. Department of Industrial and Production Engineering, Jabalpur Engineering College, Jabalpur, 482011, India

    Prakash Verma

Authors
  1. Alok Chaube
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  2. Shailesh Gupta
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  3. Prakash Verma
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Corresponding author

Correspondence to Shailesh Gupta.

Additional information

Recommended by Associate Editor Ji Hwan Jeong

Alok Chaube received his Ph.D. on Investigation of Heat Transfer Enhancement by Artificial Roughness on Surfaces from Indian Institute of Technology, Roorkee, India in 2005. He is presently working as Professor and Head of Mechanical Engineering Department at Jabalpur Engineering College, Jabalpur, India, having more than 20 years of teaching experience. Dr. Chaube visited many countries like; USA, US and China and have published more than 30 research paper in journals of National and International repute. He has been involved with research in Heat Transfer and CFD, Energy Enhancement Technologies, Non conventional energy sources, MIS for Energy Systems, Rural Energy Management etc.

Prakash Verma is presently working as Professor and Head of Industrial and Production Engineering Department at Jabalpur Engineering College, Jabalpur, India, having more than 20 years of teaching experience. He obtained his Ph.D. on dynamic modelling for emission control policies in urban transport system in the year 2005 from Indian Institute of Technology, Delhi, India. Dr. Verma has 25 journal and more than 30 conference proceedings publications. His major field of interest is total quality control, six sigma, supply chain management and system dynamics.

Shailesh Gupta is a Ph.D. student at the Mechanical Engineering Department of Rajiv Gandhi Technological University, Bhopal, India. He has M. Tech. in Thermal Engineering from Maulana Azad National Institute of Technology, Bhopal, India. His research interests are heat transfer enhancement of surfaces, micro channel cooling, fluid Dynamics etc. Mr. Gupta is life member of ISTE, ASHMT and Institution of Engineers (India).

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Chaube, A., Gupta, S. & Verma, P. Heat transfer and friction factor enhancement in a square channel having integral inclined discrete ribs on two opposite walls. J Mech Sci Technol 28, 1927–1937 (2014). https://doi.org/10.1007/s12206-014-0143-1

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  • DOI: https://doi.org/10.1007/s12206-014-0143-1

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