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Effect of providing gap in multiple-arc rib-roughened solar air heater - Part 1

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Abstract

Roughness is an effectual way to augment heat transfer in solar air heater (SAH). Multiple arcs (with gap) type of roughness has considered in this work and experimentation is performed to determine their effect on thermo-hydraulic performance of rectangular channel SAH duct. The experimentation is performed to analyze the effect of different parameters (both roughness as well as flow). Roughness parameters; number of gaps (Ng) and rib gap width (g) has considered with fixed value of pitch (p), rib width (w), rib height (e), arc angle (or). The effect of considered parameters was investigated experimentally on Nusselt number (Nu) and friction penalty (f). Strong impact of roughness parameters is observed on the Nusselt number (Nu) and frictional penalty (f). In comparison to smooth duct, 5.57 times higher Nusselt number is obtained along with increase of frictional penalty by 4.46 times at number of gaps (Ng) of 3. The domination of Nusselt number (Nu) over frictional penalty (f) resulted tremendous increment in thermo-hydraulic performance (TPP) with the highest value of 3.46 at Ng = 3 and relative-roughness-width (g/e) = 1.0.

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Abbreviations

A :

Area

C d :

Discharge coefficient

Δh :

Manommetric head

h :

Heat transfer (HT) coefficient

m :

Mass rate of air flow

P :

Pressure

fm :

Mean flow

i :

Inlet

o :

Outlet

p :

Plate

pm :

Mean plate

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Authors and Affiliations

  1. CGC Chandigarh Engineering College (Campus-Landran), Mohali, India

    Rajneesh Kumar & Mukesh Kumar

  2. National Institute of Technology Hamirpur, Hamirpur, India

    Rajneesh Kumar & Varun Goel

Authors
  1. Rajneesh Kumar
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  2. Varun Goel
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  3. Mukesh Kumar
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Corresponding author

Correspondence to Rajneesh Kumar.

Additional information

Recommended by Editor Yong Tae Kang

Rajneesh Kumar is working as an Assisted Professor in Mechanical Engineering Department, Chandigarh Engineering College Landran and research scholar at National Institute of Technology Hamir-pur(H.P), India.

Varun received his Ph.D. degree from National Institute of Technology Hamir-pur (H.P), India. He is working in the area of heat transfer, life cycle assessment and renewable energy (solar energy).

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Kumar, R., Goel, V. & Kumar, M. Effect of providing gap in multiple-arc rib-roughened solar air heater - Part 1. J Mech Sci Technol 34, 2619–2625 (2020). https://doi.org/10.1007/s12206-020-0535-3

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  • DOI: https://doi.org/10.1007/s12206-020-0535-3

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