THERMAL SCIENCE

International Scientific Journal

Jitesh Rana

,

Anshuman Silori

,

Rajesh Maithani

,

Sunil Chamoli

COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF A V-RIB WITH GAP ROUGHENED SOLAR AIR HEATER

ABSTRACT
A computational fluid dynamics (CFD) analysis of a solar air heater has been carried out using v-shaped ribs as artificial roughness on the absorber plate. The relative roughness pitch (P/e=6-12), Reynolds number (Re=3800-18000), and relative roughness height (e/D=0.042), angle of attack (α=30°-75°) have been selected as design variables of V-shaped rib for analysis. ANSYS FLUENT 15.0 with renormalization group k-ε turbulence model is selected for the analysis of computational domain of solar air heater. The enhancement of Nusselt number and friction factor with Reynolds number for different values of a relative roughness pitch (P/e) are presented and discussed by CFD analysis. The effect of angle of attack (α) and Reynolds number on enhancement of Nusselt number (Nu) and friction factor (f) is also presented. The optimum value of rib configuration based on constant pumping power requirement has been derived using thermo-hydraulic performance parameter and has been found maximum at angle of attack of 60° and P/e = 10.
KEYWORDS
nusselt number, friction factor, CFD, V-ribs
PAPER SUBMITTED: 2016-08-31
PAPER REVISED: 2016-10-27
PAPER ACCEPTED: 2017-01-07
PUBLISHED ONLINE: 2017-02-12
DOI REFERENCE: https://doi.org/10.2298/TSCI160831010R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 2, PAGES [963 - 972]
REFERENCES
  1. Singh, S., et al., Heat Transfer and Friction Factor Correlations of Solar Air Heater Ducts Artificially Roughened with Discrete V-Down Ribs, Energy, 36 (2011). 8, pp. 5053-5064
  2. Kumar, A., et al., Heat and Fluid Flow Characteristics of Roughened Solar Air Heater Ducts A Review, Renewable Energy, 47 (2012), Nov., pp. 77-94
  3. Chaube, A., et al., Analysis of Heat Transfer Augmentation and Flow Characteristics Due to Rib Roughness over Absorber Plate of a Solar Air Heater, Renewable Energy, 31 (2006), 3, pp. 317-31
  4. Yadav, A. S., Bhagoria, J. L., A CFD-Based Heat Transfer and Fluid Flow Analysis of a Solar Air Heater Provided with Circular Transverse Wire Rib Roughness on the Absorber Plate, Energy, 55 (2013), June, pp. 1127-1142
  5. Varun, R. P., et al., Investigation of Thermal Performance of Solar Air Heater Having Roughness Elements as a Combination of Inclined and Transverse Ribs on Absorber Plate, Renewable Energy, 33 (2008), 6, pp. 1398-1405
  6. Tanda, G., Performance of Solar Air Heater Ducts with Different Types of Ribs on the Absorber Plate, Energy, 36 (2011), 11, pp. 6651-6660
  7. Muluwork, K. B., Investigations on Fluid Flow and Heat Transfer in Roughened Absorber Solar Heaters, Ph. D. dissertation IIT Roorkee, Roorkee, Uttarakhard, India, 2000
  8. Momin, A. M. E., et al., Heat Transfer and Friction in Solar Air Heater Duct with V-Shaped Rib Roughness on Absorber Plate, International Journal of Heat and Mass Transfer, 45 (2002), 16, pp. 3383-3396
  9. Kumar, A., et al., Computational Fluid Dynamics Based Analysis of Angled Rib Roughened Solar Air Heater Duct, International Journal of Thermal Technologies, 3 (2013), 2, pp. 43-47
  10. Kumar, A., Kim, M.-H., Effect of Roughness width Ratios in Discrete Multi V-Rib with Staggered Rib Roughness on Overall Thermal Performance of Solar Air Channel, Solar Energy, 119 (2015), Sept., pp. 399-414
  11. Sahu, M. M., Bhagoria, J. L., Augmentation of Heat Transfer Coefficient by Using 90° Broken Transverse Ribs on Absorber Plate of Solar Air Heater, Renewable Energy, 30 (2005), 11, pp. 2057-2073
  12. Sharma, A. K., Thakur, N. S., CFD Based Fluid Flow and Heat Transfer Analysis of a V-Shaped Roughened Surface Solar Air Heater, International Journal of Advanced Engineering Technology, 4 (2012) 5, pp. 2115-2121
  13. Maithani, R., Saini, J. S., Heat Transfer and Fluid Flow Behavior of a Rectangular Duct Roughened with V-Ribs with Symmetrical Gaps, Int. J. Ambient Energy, 38 (2015), 4, pp. 347-355
  14. Kumar, A., et al., Experimental Investigation on Heat Transfer and Fluid Flow Characteristics of Air Flow in a Rectangular Duct with Multi V-Shaped Rib with Gap Roughness on the Heated Plate, Sol. Energy, 86 (2012), 6, pp. 1733-1749
PDF VERSION [DOWNLOAD]
Computational fluid dynamics analysis of a V-rib with gap roughened solar air heater

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence