NUMERICAL FRAMEWORK FOR ANALYZING COUPLED HEAT TRANSFER AND FLOW LOSSES IN FIN-MODIFIED SOLAR AIR HEATING SYSTEMS Mazin Y. Abdul-Kareem International Journal of Applied Mathematics, 2025 This study presents a numerical investigation into the thermo-hydraulic performance of a solar air heater (SAH) duct enhanced with inclined fins. The analysis explores a wide range of fin tilt angles (α = 15° to 135°) and Reynolds numbers (Re = 2,000 to 22,000), emphasizing a novel geometric configuration with bottom-mounted fins and heat supplied from the top absorber plate. The fin geometry includes a protrusion of 1.00 mm, length of 5.00 mm, and pitch of 10.00 mm, while the duct height is reduced to 9.00 mm to intensify flow interaction. Computational Fluid Dynamics (CFD) simulations using the RNG k-ε turbulence model are conducted to evaluate the Nusselt number (Nu), friction factor (f), and thermo-hydraulic performance parameter (THPP). Results predict enhanced turbulence and heat transfer due to the aggressive fin design, with a corresponding increase in pressure drop. Extreme fin angles are expected to cause complex vortex dynamics and recirculation. The findings offer valuable insights into performance optimization and support future validation studies through experimental and 3D CFD approaches.
ENERGY EFFICIENCY ENHANCEMENT FOR SOLAR AIR HEATER BY USING CORRUGATED RIBS WITH VARIABLE HEAT FLUX FOR LAMINAR FLOW Suha K. Jebir International Journal of Applied Mathematics, 2025 An experimental analysis is conducted to determine how corrugated absorbent tubes affect the functionality of a collector with a parabolic trough (PTC). Nine distinct helically corrugated absorbent pipes were employed for this particular purpose. Using ASHRAE standard 93 (2010) as a guide, the effects of pitch size and irregularity height upon PTC effectiveness were investigated. The range of the Re was 5000–10,000. The findings show the thermal efficiency and heat transmission. With corrugated pipes, the typical heat transfer rates rose from 85.7 to 107.2%, correlated with the pitch's percentage and irregularity height. When it equals 3 mm & 1.5 mm, respectively, the thermal efficiency reaches a maximum level of around 2.29, for both the 3 or 1.5-mm pitch size and roughness elevation respectively. In wavy pipes, the average coefficient of friction rises by 1.25 – 1.85 at certain times. Additionally, applying the most effective fit for the sequence of measurements, the changes with the Nu, as well as friction factor with pitch-to-diameter ratio, roughness, Pr, and Re, are provided as relationships.
Numerical Investigation of Thermal Performance for Turbulent Water Flow through Dimpled Pipe Ansam Adil Mohammed, Mahmoud Sh. Mahmoud, Suha K Jebir, Ahmed F. Khudheyer Cfd Letters, 2024 Dimples are tiny indentations on the surfaces of the body that enhance heat transfer and alter fluid flow characteristics on or within the body. Numerical investigations were conducted to analyse the heat transfer and flow characteristics in a cross-combined dimple tube in the range of Reynolds numbers from 6000 to 14000. The finite volume method recognised a novel enhancement model utilising methods for composite-form surfaces. Compared to a smooth tube working similarly, the effects significantly improve the heat transfer index, performance evaluation criteria, and friction factor. A three-dimensional simulation was conducted to clarify the underlying process by which dimples affect thermal performance. The simulation findings suggest that the dimples effectively enhance heat transfer by altering the temperature distribution and increasing the temperature gradient within the central area of the dimple section. A concave surface profile disrupts the flow and prevents the formation of a stable boundary layer, promoting the mixing of hot and cold fluids. Furthermore, the study investigates how geometric characteristics impact thermal and hydraulic efficiencies, emphasising that larger dimples improve overall thermo-hydraulic performance. Specifically, the heat transfer enhancement achieved an average increase of 17.3%, ranging from 18.03% to 38.6%, surpassing that of the traditional smooth tube.
Effect of different nanofluids on solar radiation absorption Journal of Mechanical Engineering Research and Developments, 2020
RECENT SCHOLAR PUBLICATIONS
Thermal performance for solar trough collector with double absorber pipes MYA Ahmed F. Khudheyer, Suha K. Jebir International Journal of Mechanical Engineering 7 (1), 571-578 , 2022 2022
Enhancement of energy transferred in a pipe that equipped with a fixed Spiral Tape – Review SK Jebir International Journal of Advances in Engineering and Management (IJAEM) 3 … , 2021 2021
The use of a parabolic trough concentrator at intermediate temperature to thermal commercial progressions AFK Suha K. Jebir ,Mazin Y Abdulkareem International Journal of Latest Engineering and Management Research (IJLEMR … , 2021 2021
Effect Of Different Nanofluids On Solar Radiation Absorption AFK ,Suha Kareem Jebir , Noor Yehia Abbas Journal of Mechanical Engineering Research and Developments 44 (1), 190-206 , 2021 2021 Citations: 4
Effect of inclination interrupted fin arrays with isoflux on convection heat transfer SK Jebir International Journal of Application or Innovation in Engineering … , 2017 2017
Numerical investigation of natural convection heat transfer from V-fin arrays with constant heat flux SK Jebir International Journal of Scientific & Engineering Research 7 (4), 1106-1117 , 2016 2016
MOST CITED SCHOLAR PUBLICATIONS
Effect Of Different Nanofluids On Solar Radiation Absorption AFK ,Suha Kareem Jebir , Noor Yehia Abbas Journal of Mechanical Engineering Research and Developments 44 (1), 190-206 , 2021 2021 Citations: 4
Thermal performance for solar trough collector with double absorber pipes MYA Ahmed F. Khudheyer, Suha K. Jebir International Journal of Mechanical Engineering 7 (1), 571-578 , 2022 2022
Enhancement of energy transferred in a pipe that equipped with a fixed Spiral Tape – Review SK Jebir International Journal of Advances in Engineering and Management (IJAEM) 3 … , 2021 2021
The use of a parabolic trough concentrator at intermediate temperature to thermal commercial progressions AFK Suha K. Jebir ,Mazin Y Abdulkareem International Journal of Latest Engineering and Management Research (IJLEMR … , 2021 2021
Effect of inclination interrupted fin arrays with isoflux on convection heat transfer SK Jebir International Journal of Application or Innovation in Engineering … , 2017 2017
Numerical investigation of natural convection heat transfer from V-fin arrays with constant heat flux SK Jebir International Journal of Scientific & Engineering Research 7 (4), 1106-1117 , 2016 2016
