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Heat and Mass Transfer

, Volume 55, Issue 12, pp 3369–3412 | Cite as

A detailed review on various V-shaped ribs roughened solar air heater

  • Sheetal Kumar JainEmail author
  • Ghanshyam Das Agrawal
  • Rohit Misra
Review

Abstract

Solar air heater (SAH) is a popular and economical device which collects the solar energy and is employed for space heating, drying of agricultural products, food items, and leather, seasoning of timber, etc. Attachment of artificial roughness on the absorber surface is an appropriate method to augment the heat transfer from the heated surface to the air flowing through SAH duct. Use of artificial roughness has been an area of great interest for researchers as far as the cooling of turbine blades, and combustion chambers are concerned. This technique is effective in enhancing the heat transfer in a micro-channel heating/cooling system. Present paper holistically furnishes concise information about various kinds of V-shaped roughness geometries used in SAHs for improving its performance covering experimental, analytical, numerical and computational fluid dynamics (CFD) approaches. In this paper, 124 research articles have been referred, which provide a detailed comprehensive and comparative study revealing the effect of various geometrical parameters and different V-shaped roughness patterns on the performance of SAH. This article also brings in the information about the correlation developed by researchers for heat transfer and friction factor. This comprehensive review will be quite useful for technical persons and researchers working in the area of SAH.

Nomenclature

Ap

Actual heat transfer surface area, m2.

Cp

Specific heat, J/kg K.

Dh or D

Channel hydraulic diameter, m.

h

Heat transfer coefficient, W/m2 K.

I

Solar radiation intensity, W/m2.

L

Test section length, m.

Qu

Useful heat transfer rate, W.

Ta

Ambient temperature of air, K.

Tfm

Bulk mean air temperature, K.

Ti

Air inlet temperature, K.

To

Air outlet temperature, K.

Tpm

Absorber plate mean temperature, K.

Ts

Temperature of Sun, K.

∆P

Pressure drop in the duct, Pa.

Pm

Pumping power.

Vw

Wind velocity, m/s.

W

Duct width, m.

X

Length in axial direction, m.

Dimensionless parameter

B/S

Relative roughness length of discrete rib elements.

b/D

Wall thickness to the channel width.

b/H

Blockage ratio.

CFD

Computational fluid dynamics.

d/w

Relative gap position.

e/D or e/Dh

Relative roughness height.

e/H

Baffle blockage ratio.

e+

Reynolds roughness number.

f

Friction factor.

fr

Friction factor for roughened duct.

fs

Friction factor for smooth duct.

g/e

Relative gap width.

Hb/H

Relative baffle height.

L/D

Length-to-hydraulic diameter ratio.

l/e

Hole position to baffle height ratio.

Ng

Number of gaps.

Nu

Nusselt number.

Nur

Nusselt number for roughened duct.

Nus

Nusselt number for smooth duct.

O/e

Relative baffle hole location.

PR

Pitch to channel height ratio.

P/e

Relative roughness pitch.

P/H

Baffle pitch spacing ratio.

Pb/H

Relative pitch ratio.

Pb/ed

Relative dimple obstacle pitch.

Ps/P

Relative staggered rib position.

p’/P

Relative staggered pitch ratio.

R

Reynolds number function.

Re

Reynolds number.

r/e

Relative staggered rib size.

SAH

Solar air heater.

St

Stanton number.

SR/e

Relative discrete position or distance.

St/Sts

Stanton number ratio.

s’/S

Relative gap position.

THP

Thermohydraulic performance.

THPP

Thermohydraulic performance parameter.

W/H

Channel aspect ratio.

W/w

Relative roughness width.

Wc/Wd

Relative dimpled obstacles width.

WD/WB

Relative dimpled obstacles width.

Greek symbols

α

Angle of attack, °.

β

Open area ratio or collector slope.

δ

Transition sublayer thickness.

ε

Dissipation rate, m2/s3.

ηeff

Effective efficiency.

ηth

Thermal efficiency.

k

Turbulent kinetic energy, m2/s2.

μ

Dynamic viscosity, Pa-s.

ρ

Density of air, kg/m3.

∆ρ/ρ

Inlet coolant to wall density ratio.

ϕ

Chamfer angle, °.

ψ

Circularity.

Notes

Acknowledgments

The first author enormously accepts the financial support from MNIT Jaipur and Ministry of Human Resources and Development (MHRD), Govt. of India in the scheme of research scholarship to accomplish this work.

Compliance with ethical standards

Conflict of Interest

Authors declare that they don’t have any conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Sheetal Kumar Jain
    • 1
    Email author
  • Ghanshyam Das Agrawal
    • 1
  • Rohit Misra
    • 2
  1. 1.Department of Mechanical EngineeringMalaviya National Institute of TechnologyJaipurIndia
  2. 2.Department of Mechanical EngineeringGovt. Engineering CollegeAjmerIndia

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