https://orcid.org/0009-0006-9324-3109
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ABSTRACT
A 2D analysis of the solar air collector of an indirect solar dryer with pentagonal corrugation on the absorber plate was carried out using ANSYS Fluent 16.0 to enhance the performance. SIMPLE algorithm and RNG k-ε model were used for resolving the governing expressions. Corrugation pitch (p), height (e), angle (α) and Reynolds number (Re) were considered as design parameters for the analysis. The p was varied from 50 to 175 mm and an optimized p value was proposed. The Re range used was 1800 15,000. The velocity, velocity vector, and turbulent kinetic energy were presented. Performance characteristics such as Nusselt number (Nu), friction factor (f), Nu ratio, f ratio and thermo-hydraulic performance parameter (Thpp) were determined and compared for different p and Re. The Nu ratio obtained was 1.81–2.88 and it was proved that corrugation gives a maximum of 2.88 times heat transfer enhancement than a flat plate. Maximum Thpp was found to be 1.748 and was obtained at p = 150 mm and low Re (1800). The proposed optimum pitch was 150 mm (relative roughness pitch, p/e of 15). The outcomes of the present analysis were validated with existing publications and found that the results are comparable.
Nomenclature
| Dh | = | hydraulic diameter, mm |
| e | = | corrugation height, mm |
| f | = | friction factor |
| g | = | groove position |
| h | = | heat transfer coefficient, W/m2 K |
| H | = | depth, mm |
| k | = | thermal conductivity, W/m K |
| l | = | Diagonal length of test section |
| L | = | length, mm |
| Nu | = | Nusselt number |
| p | = | pitch, mm |
| Pr | = | Prandtl number |
| ΔP | = | pressure drop, Pa |
| Re | = | Reynolds number |
| T | = | Temperature, K |
| Thpp | = | thermo-hydraulic performance parameter |
| u | = | inlet velocity, m/s |
| W | = | Width, mm |
| Greek Symbols | = | |
| α | = | corrugation angle, º |
| μ | = | dynamic viscosity, Ns/m2 |
| ɸ | = | rib wedge angle, º |
| ρ | = | air density, kg/m3 |
| = | stress tensor | |
| Subscripts | = | |
| Etk | = | Turbulent kinetic energy |
| r | = | rough |
| s | = | smooth |
| 0 | = | ambient |
| Abbreviations | = | |
| ISD | = | Indirect solar dryer |
| SAC | = | Solar air collector |
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Funding
Notes on contributors
Sai Sreeharsha Adavi
Sai Sreeharsha Adavi is a B.Tech student of the Mechanical Engineering Department at the National Institute of Technology Warangal, India, under the supervision of Prof. V. P. Chandramohan. His main fields of research are computational fluid dynamics, aerodynamics and heat transfer. He has also done intern at the Defence Research and Development Organization, Hyderabad, India on liquid propulsion systems. He is a motivated young researcher and started his research work in his 2nd year of B.Tech.
V. P Chandramohan
V. P Chandramohan is presently working as a Professor in the Department of Mechanical Engineering, National Institute of Technology Warangal, India. He graduated in Mechanical engineering from Manonmaniam Sundaranar University in 2001, completed his Master of Engineering in Thermal Power Engineering from Annamalai University in 2002 and MBA Project Management in 2009. He obtained his Ph.D. from IIT Delhi, India in 2012. His research interests are; (i) Computational Fluid Dynamics (ii) Convection and conduction heat transfer (iii) Drying and Simultaneous solution of heat and mass transfer (iv) Solar energy (v) Micro blower. He has more than 150 publications in International reputed journals, book chapters and conferences. He is handling a lot of sponsored research projects from various funding sources. He got various awards such as a Top2% Researchers listed by Stanford University, Gold medal for ME (Thermal Power) and Dr. S. Sathik prize from Annamalai University, DST-SERB Empowerment Scheme Award 2016, ScienceDirect TOP 25 Hottest Articles award, etc. He is serving as Editorial Board Members and reviewers in various reputed journals in his own field of expertise.