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CFD Analysis on Rectangular Shaped Variable Height Turbulators Fitted in a Solar Air Heater for Improved Thermal Performance

H. S. Arunkumar(1), K. Vasudeva Karanth(2), N. Yagnesh Sharma(3), N. Madhwesh(4*)

(1) Manipal Institute of Technology, Manipal Academy of Higher Education, India
(2) Manipal Institute of Technology, Manipal Academy of Higher Education, India
(3) Manipal Institute of Technology, Manipal Academy of Higher Education, India
(4) Manipal Institute of Technology, Manipal Academy of Higher Education, India
(*) Corresponding author


DOI: https://doi.org/10.15866/iremos.v14i3.19939

Abstract


There have been various studies on the effect of turbulators of different shapes integrated with the absorber plate's underside for improved performance. However, a study on rectangular profiled variable height turbulators along the flow direction is not available. In this paper, an attempt has been made to explore in detail this aspect. The roughness of different kinds on the heat transfer surface mainly creates turbulence and breaks the laminar sub-layer, enhancing the heat transfer rate. In the present work, a solar air heater's performance incorporated rectangular profiled variable height turbulators of different configurations, i.e. increasing height turbulators, decreasing height turbulators and constant height turbulators, are being numerically investigated. For the base model, i.e. without any turbulators, a numerical and experimental analysis has been carried to establish the present analysis's overall validity. All tested turbulators show better performance compared to the base model. Configuration, which has to decrease in height towards the flow direction, shows relatively higher performance in terms of heat transfer coefficient, outlet temperature, and thermohydraulic enhancement factor than that of the other configurations. It is found from the analysis that for decreasing height turbulators, there is an enhancement of 21% to 0.2% for the Reynolds number from 3000 to 15000, respectively. For the higher Reynolds number above 15000, the THEF will be lesser than the base model.
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Keywords


Solar Air Heater; Nusselt Number; Thermo-Hydraulic Enhancement Factor; Turbulator

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References


Palacios, A., Ramos, O., Amaya, D., Thermal Performance Study of the Fluid of a Collector Using Finite Elements with Computational Tools (CFD), (2018) International Review of Mechanical Engineering (IREME), 12 (2), pp. 189-195.
https://doi.org/10.15866/ireme.v12i2.14235

Lahbari, M., Fahloul, D., Experimental Study and Mathematical Modelling of Loquat Drying: Effect of the Drying Method on Quality, (2020) International Review of Mechanical Engineering (IREME), 14 (3), pp. 208-217.
https://doi.org/10.15866/ireme.v14i3.18276

Anbuchezhian, N., Velmurugan, T., Priyadharshini, G., Krishnamoorthy, R., Novel Design of Hybrid Steam Turbine Reflector Based Controller for Solar Power Plant, (2020) International Review of Mechanical Engineering (IREME), 14 (9), pp. 572-578.
https://doi.org/10.15866/ireme.v14i9.19510

Manjunath, M.S., Karanth, K.V. and Sharma, N.Y., Numerical analysis of the influence of spherical turbulence generators on heat transfer enhancement of flat plate solar air heater. Energy, 121, pp.616-630, 2017.
https://doi.org/10.1016/j.energy.2017.01.032

Kumar, R., Geol, V. and Kumar, A, A parametric study of the 2D model of solar air heater with elliptical rib roughness using CFD. Journal of Mechanical Science and Technology, 31(2), pp.959-964, 2017.
https://doi.org/10.1007/s12206-017-0148-7

Henaoui, M., Aliane, K., Study on Solar Air Collector with Perforated Strips in the Baffles, (2019) International Review of Mechanical Engineering (IREME), 13 (4), pp. 249 255.
https://doi.org/10.15866/ireme.v13i4.16985

Elgadi, A., Tan, Y., Tai, V., Thermal Performance Evaluation of Binary Fatty Acid/Expanded Graphite Composite as a Thermal Storage Medium for Solar Air Heater, (2020) International Review of Mechanical Engineering (IREME), 14 (10), pp. 626-634.
https://doi.org/10.15866/ireme.v14i10.19724

Mahmoud, A., Yahya, Z., Improvement in the Performance of a Solar Hot Air Generator Using a Circular Cone, (2019) International Review of Mechanical Engineering (IREME), 13 (8), pp. 481-492.
https://doi.org/10.15866/ireme.v13i8.17385

Satam, A., Raibhole, V., A Comparative Study of the Enhancement of Heat Transfer by Delta Wing Vortex Generators and V-Shaped Dimples Using Experimentation and CFD, (2017) International Review of Mechanical Engineering (IREME), 11 (10), pp. 769-773.
https://doi.org/10.15866/ireme.v11i10.12898

Antony, A.L., Shetty, S.P., Madhwesh, N., Sharma, N.Y. and Karanth, K.V., 2020. Influence of stepped cylindrical turbulence generators on the thermal enhancement factor of a flat plate solar air heater. Solar Energy, 198, pp.295-310.
https://doi.org/10.1016/j.solener.2020.01.065

Shetty, S.P., Madhwesh, N. and Karanth, K.V., 2021. Numerical analysis of a solar air heater with a circular perforated absorber plate. Solar Energy, 215, pp.416-433.
https://doi.org/10.1016/j.solener.2020.12.053

Wang, D., Liu, J., Liu, Y., Wang, Y., Li, B. and Liu, J., 2020. Evaluation of the performance of an improved solar air heater with "S" shaped ribs with the gap. Solar Energy, 195, pp.89-101.
https://doi.org/10.1016/j.solener.2019.11.034

Nidhul, K., Kumar, S., Yadav, A.K. and Anish, S., 2020. Enhanced thermo-hydraulic performance in a V-ribbed triangular duct solar air heater: CFD and exergy analysis. Energy, 200, p.117448.
https://doi.org/10.1016/j.energy.2020.117448

Srivastava, A., Chhaparwal, G.K. and Sharma, R.K., 2020. Numerical and experimental investigation of different rib roughness in a solar air heater. Thermal Science and Engineering Progress, 19, p.100576.
https://doi.org/10.1016/j.tsep.2020.100576

Saravanakumar, P.T., Somasundaram, D. and Matheswaran, M.M., 2020. Exergetic investigation and optimization of arc-shaped rib roughened solar air heater integrated with fins and baffles. Applied Thermal Engineering, 175, p.115316.
https://doi.org/10.1016/j.applthermaleng.2020.115316

Benaouda, N. E., Khellaf, A. and Zeghmati, B, Modeling, simulation and experimental validation of a typical flat plate air-heating collector for drying purposes, Proceedings of 2015 IEEE International Renewable and Sustainable Energy Conference, IRSEC 2015, 2016.
https://doi.org/10.1109/irsec.2015.7454941

Maurya, R. S. and Ansari, Z. A. J, Effect of flow and geometry parameters on solar air heater performance, THERMINIC 2016 - 22nd International Workshop on Thermal Investigations of ICs and Systems, pp. 319–322, 2016.
https://doi.org/10.1109/therminic.2016.7749075

Ravi, R.K. and Saini, R.P., 2016. Experimental investigation on the performance of a double pass artificial roughened solar air heater duct having roughness elements of the combination of discrete multi V-shaped and staggered ribs. Energy, 116, pp.507-516.
https://doi.org/10.1016/j.energy.2016.09.138

Hans, V. S., Gill, R. S. and Singh, S., Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with broken arc ribs, Experimental Thermal and Fluid Science, Vol 80, pp 77-89, 2017.
https://doi.org/10.1016/j.expthermflusci.2016.07.022

Shuilian Li, Hui Wang, Xiangrui Meng, Xinli Wei, Comparative study on the performance of a new solar air collector with different surface shapes, Applied Thermal Engineering, Vol 114, pp 639 – 644, 2017.
https://doi.org/10.1016/j.applthermaleng.2016.12.026

Arunkumar, H.S., Kumar, S. and Karanth, K.V., Analysis of a solar air heater for augmented thermohydraulic performance using helicoidal spring shaped fins-A numerical study. Renewable energy, 160, pp.297-311, 2020.
https://doi.org/10.1016/j.renene.2020.06.098

Kushmeet, K., Prajapati, D. R. and Samir, S. (2016) Heat Transfer and Friction Factor Correlations Development for Solar Air Heater Duct, Experimental Thermal and Fluid Science, Vol 82, pp 249-261, 2017.
https://doi.org/10.1016/j.expthermflusci.2016.11.012

Qader, B.S., Supeni, E.E., Ariffin, M.K.A. and Talib, A.A., RSM approach for modelling and optimization of designing parameters for inclined fins of the solar air heater. Renewable energy, 136, pp.48-68, 2019.
https://doi.org/10.1016/j.renene.2018.12.099

Promthaisong, P. and Eiamsa-ard, S., Fully developed periodic and thermal performance evaluation of a solar air heater channel with wavy-triangular ribs placed on an absorber plate. International Journal of Thermal Sciences, 140, pp.413-428, 2019.
https://doi.org/10.1016/j.ijthermalsci.2019.03.010

Kumar, A. and Layek, A., Nusselt number and friction factor correlation of solar air heater having twisted-rib roughness on absorber plate. Renewable energy, 130, pp.687-699, 2019.
https://doi.org/10.1016/j.renene.2018.06.076

Singh, S., Dhruw, L. and Chander, S., Experimental investigation of a double pass converging finned wire mesh packed bed solar air heater. Journal of Energy Storage, 21, pp.713-723, 2019.
https://doi.org/10.1016/j.est.2019.01.003

M.T. Baissi, A. Brima, K. Aoues, R. Khanniche, N. Moummi, Thermal behavior in a solar air heater channel roughened with delta-shaped vortex generators, Applied Thermal Engineering, Volume 165, 2020, 113563, ISSN 1359-4311,
https://doi.org/10.1016/j.applthermaleng.2019.03.134

Anbuchezhian, N., Velmurugan, T., Priyadharshini, G., Krishnamoorthy, R., Novel Design of Hybrid Steam Turbine Reflector Based Controller for Solar Power Plant, (2020) International Review of Mechanical Engineering (IREME), 14 (9), pp. 572-578.
https://doi.org/10.15866/ireme.v14i9.19510


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