Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

Man Singh Azad; Apurba Layek

doi:doi:10.11648/j.ijfmts.20190502.13

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Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

Man Singh Azad, Apurba Layek

Published in International Journal of Fluid Mechanics & Thermal Sciences (Volume 5, Issue 2)

Received: 9 April 2019 Accepted: 20 May 2019 Published: 12 June 2019

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Abstract

The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m² on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.

Published in	International Journal of Fluid Mechanics & Thermal Sciences (Volume 5, Issue 2)
DOI	10.11648/j.ijfmts.20190502.13
Page(s)	50-62
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Solar Air Heater, Artificial Roughness, Computational Fluid Dynamics (CFD), ANSYS FLUENT, Correlations

References

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[2]	Hachemi A. Thermal performance enhancement of solar air heaters, by a fan-blown absorber plate with rectangular fins. Int. J. Energy Res. 1995; 19: 567-577.
[3]	Chabane F, Moummi N, Benramache S. Experimental study of heat transfer and thermal performance with longitudinal fins of solar air heater. J. Adv. Res. 2014; 5: 183-192.
[4]	Chabane F, Moummi N, Benramache S, Bensahal D, Belahssen O. Collector efficiency by single pass of solar air heaters with and without using fins. Eng. J. 2012; 17: 43-55.
[5]	Ibrahim Z, Ibarahim Z, Yatim B, Ruslan H Md. Thermal efficiency of single-pass solar air collector. AIP Conference Proceedings 1571, 90 (2013); doi: 10.1063/1.4858635.
[6]	Kasayapanand N, Kiatsiriroat T, Vorayos N. Enhanced heat transfer in a solar air heater with double-flow configuration by electro hydrodynamic technique. J. Enhanced Heat Transf. 2006; 13: 39-52.
[7]	Rajpoot SS, Koli DK. CFD analysis of solar air heater duct with rectangular rib surface. Int. J. Eng. Trends Tech. 2013; 4: 3006-3011.
[8]	Dogra S. Effect of artificial roughness on thermal and thermohydraulic efficiency in rectangular duct of a double pass solar air heater by using transverse ribs on the absorber plate. Int. J. Mod. Eng. Res. 2013; 3: 2271-2274.
[9]	Kumar TS, Thakur NS, Kumar A, Mittal V. Use of artificial roughness to enhance heat transfer in solar air heaters - a review. J. Energy Southern Africa 2010; 21: 35-51.
[10]	Vyas AA, Shringi D. CFD based thermal efficiency analysis of solar air heater with smooth plate and perforated plate. Imp. J. Interdisc. Res. 2017; 3: 415-422.
[11]	Tapas V, Sao AK, Sharma P. Computational analysis of an artificial roughened surface of solar air heater. Int. J. Innovative Res. Sci. Eng. Tech. 2015; 4: 12205-12212.
[12]	Prasad BN, Saini JS. Effect of artiﬁcial roughness on heat transfer and friction factor in a solar air heater. Solar Energy 1988; 41: 555-560.
[13]	Karwa R, Bairwa RD, Jain BP, Karwa N. Experimental study of the effects of rib angle and discretization on heat transfer and friction in an asymmetrically heated rectangular duct. J. Enhanced Heat Transf. 2005; 12: 343–55.
[14]	Arjumand Rasool, Adnan Qayoum. Numerical analysis of heat transfer and friction factor in two-pass channels with variable rib shapes. International Journal of Heat and Technology. 36 91) 2018, 40-48. https://doi.org/10.18280/ijht.360106.
[15]	ANSYS FLUENT 13.0 Theory Guide, ANSYS Inc., 2010.

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APA Style

Man Singh Azad, Apurba Layek. (2019). Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. International Journal of Fluid Mechanics & Thermal Sciences, 5(2), 50-62. https://doi.org/10.11648/j.ijfmts.20190502.13

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ACS Style

Man Singh Azad; Apurba Layek. Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. Int. J. Fluid Mech. Therm. Sci. 2019, 5(2), 50-62. doi: 10.11648/j.ijfmts.20190502.13

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AMA Style

Man Singh Azad, Apurba Layek. Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. Int J Fluid Mech Therm Sci. 2019;5(2):50-62. doi: 10.11648/j.ijfmts.20190502.13

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@article{10.11648/j.ijfmts.20190502.13,
  author = {Man Singh Azad and Apurba Layek},
  title = {Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements},
  journal = {International Journal of Fluid Mechanics & Thermal Sciences},
  volume = {5},
  number = {2},
  pages = {50-62},
  doi = {10.11648/j.ijfmts.20190502.13},
  url = {https://doi.org/10.11648/j.ijfmts.20190502.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijfmts.20190502.13},
  abstract = {The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.},
 year = {2019}
}

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TY  - JOUR
T1  - Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements
AU  - Man Singh Azad
AU  - Apurba Layek
Y1  - 2019/06/12
PY  - 2019
N1  - https://doi.org/10.11648/j.ijfmts.20190502.13
DO  - 10.11648/j.ijfmts.20190502.13
T2  - International Journal of Fluid Mechanics & Thermal Sciences
JF  - International Journal of Fluid Mechanics & Thermal Sciences
JO  - International Journal of Fluid Mechanics & Thermal Sciences
SP  - 50
EP  - 62
PB  - Science Publishing Group
SN  - 2469-8113
UR  - https://doi.org/10.11648/j.ijfmts.20190502.13
AB  - The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.
VL  - 5
IS  - 2
ER  -

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Author Information

Man Singh Azad

CSIR-Central Mechanical Engineering Research Institute, Durgapur, India
Apurba Layek

Department of Mechanical Engineering, National Institute of Technology, Durgapur, India

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APA Style

Man Singh Azad, Apurba Layek. (2019). Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. International Journal of Fluid Mechanics & Thermal Sciences, 5(2), 50-62. https://doi.org/10.11648/j.ijfmts.20190502.13

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ACS Style

Man Singh Azad; Apurba Layek. Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. Int. J. Fluid Mech. Therm. Sci. 2019, 5(2), 50-62. doi: 10.11648/j.ijfmts.20190502.13

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AMA Style

Man Singh Azad, Apurba Layek. Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements. Int J Fluid Mech Therm Sci. 2019;5(2):50-62. doi: 10.11648/j.ijfmts.20190502.13

Copy | Download

@article{10.11648/j.ijfmts.20190502.13,
  author = {Man Singh Azad and Apurba Layek},
  title = {Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements},
  journal = {International Journal of Fluid Mechanics & Thermal Sciences},
  volume = {5},
  number = {2},
  pages = {50-62},
  doi = {10.11648/j.ijfmts.20190502.13},
  url = {https://doi.org/10.11648/j.ijfmts.20190502.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijfmts.20190502.13},
  abstract = {The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.},
 year = {2019}
}

Copy | Download

TY  - JOUR
T1  - Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements
AU  - Man Singh Azad
AU  - Apurba Layek
Y1  - 2019/06/12
PY  - 2019
N1  - https://doi.org/10.11648/j.ijfmts.20190502.13
DO  - 10.11648/j.ijfmts.20190502.13
T2  - International Journal of Fluid Mechanics & Thermal Sciences
JF  - International Journal of Fluid Mechanics & Thermal Sciences
JO  - International Journal of Fluid Mechanics & Thermal Sciences
SP  - 50
EP  - 62
PB  - Science Publishing Group
SN  - 2469-8113
UR  - https://doi.org/10.11648/j.ijfmts.20190502.13
AB  - The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.
VL  - 5
IS  - 2
ER  -

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