Heat transfer enhancement by laterally impinging air jet on semi-circular grooved surface

Year 2025, Volume: 11 Issue: 3, 811 - 823, 16.05.2025

A. M. Rathod Chandrashekhar K. Jadhav Rohit S. Tarte Nitin P. Gulhane Jan Taler Dawid Taler Pawel Oclon

Abstract

This study experimentally investigates the cooling rate of a jet impinging on a semi-circular grooved surface. The experiments aim to determine the magnitude of convective heat dissipation on this grooved surface, which is 6mm thick and features six evenly distributed circular grooves. The investigation considers various factors, including Reynolds numbers ranging from 4000 to 12000, clearance (z/d) between nozzle outlet to target plate, varying from 1 to 6, and the surface roughness of the plate. Local and average Nusselt numbers were calculated using experimental data on airflow behaviour in different areas of jet impingement. Compared to a smooth flat plate, the grooved surface showed a significant increase in both local and average Nusselt numbers, with the local Nusselt number increased by 11% and averaged Nusselt number by 15.23%. Heat transfer across various regions, including stagnant, transition, and wall jet, was studied under a uniform heat flux over a flat plate. Experimental results show that maximum heat dissipation occurs in the transition region for semi-circular grooved surfaces, while for smooth flat plates, it occurs in the stagnation region. The maximum percentage deviation was recorded as 15.23% with Reynolds number of 12000.

Keywords

Cooling Rate , Jet Impingement , Local Nusselt Number , Reynold Number , Semicircular Groove Surface

References

• [1] Chakroun WM, Abdel-Rahman AA, Al-Fahed SF. Heat transfer augmentation for air jet impinged on a rough surface. Appl Therm Eng 1998;18:1225-1241. [CrossRef]
• [2] Gau C, Lee IC. Flow and impingement cooling heat transfer along triangular rib-roughened walls. Int J Heat Mass Transf 2000;43: 4405-4418. [CrossRef]
• [3] Katti V, Prabhu SV. Experimental study and theoretical analysis of local heat transfer distribution between smooth flat surface and impinging air jet from a circular straight pipe nozzle. Int J Heat Mass Transf 2008;51:4480–4495. [CrossRef]
• [4] Sagot B, Antonini G, Buron F. Enhancement of jet-to-wall heat transfer using axisymmetric grooved impinging plates. Int J Therm Sci 2010;49:1026–1030. [CrossRef]
• [5] Katti VV, Yasaswy SN, Prabhu SV. Local heat transfer distribution between smooth flat surface and impinging air jet from a circular nozzle at low Reynolds numbers. Heat Mass Transf 2011;47:237–244. [CrossRef]
• [6] Caliskan S, Baskaya S. Experimental investigation of impinging jet array heat transfer from a surface with V-shaped and convergent-divergent ribs. Int J Therm Sci 2012;59:234–246. [CrossRef]
• [7] Barik AK, Mukherjee A, Patro P. Heat transfer enhancement from a small rectangular channel with different surface protrusions by a turbulent cross flow jet. Int J Therm Sci 2015;98:32–41. [CrossRef]
• [8] Attalla M, Salem M. Experimental investigation of heat transfer for a jet impinging obliquely on a flat surface. Exp Heat Transf 2015;28:378–391. [CrossRef]
• [9] Kannan BT, Sundararaj S. Steady state jet impingement heat transfer from axisymmetric plates with and without grooves. Proc Eng 2015;127:25–32. [CrossRef]
• [10] Adimurthy M, Katti VV, Venkatesha. Experimental study of fluid flow and heat transfer characteristics of rough surface, impinged by a confined laminar slot air jet. IJERT 2016;5:1–6. [CrossRef]
• [11] Adimurthy M, Katti VV. Experimental investigations on the local distribution of wall static pressure coefficient due to an impinging slot air jet on a confined rough surface. Int J Eng Technol Manage Appl Sci 2016;4:69–78.
• [12] Umair SM, Gulhane NP. On numerical investigation of heat transfer augmentation through pin fin heat sink by laterally impinging air jet. Proc Eng 2016;157:89–97. [CrossRef]
• [13] Hodges J, Osorio A, Fernandez EJ, Kapat JS, Gangopadhyay T, Sen S, et al. An experimental investigation of an array of inline impinging jets on a surface with varying rib orientations and blockages. Proceedings of the ASME Turbo Expo, American Society of Mechanical Engineers (ASME), June 26–30, 2017, Charlotte, North Carolina, USA. [CrossRef]
• [14] Shukla AK, Dewan A. Convective heat transfer enhancement using slot jet impingement on a detached rib surface. J Appl Fluid Mech 2017;10:1615–1627. [CrossRef]
• [15] Umair SM, Kolawale AR, Bhise GA, Gulhane NP. On numerical heat transfer characteristic study of flat surface subjected to variation in geometric thickness. Int J Comp Mater Sci Eng 2017;6:1750010. [CrossRef]
• [16] Nabadavis A, Mishra DP. Jet impingement heat transfer on a plate with axisymmetric square grooves—a numerical investigation. Int J Eng Technol Sci Res 2018;5:1–6.
• [17] Siddique UM, Bhise GA, Gulhane NP. On numerical investigation of local Nusselt distribution between flat surface and impinging air jet from straight circular nozzle and power law correlations generation. Heat Transf Asian Res 2018;47:126–149. [CrossRef]
• [18] Jeyajothi K, Kalaichelvi P. Augmentation of heat transfer and investigation of fluid flow characteristics of an impinging air jet on to a flat plate. Arab J Sci Eng 2019;44:5289–5299. [CrossRef]
• [19] Mohd US, Ansari E, Khan SA, Gulhane NP, Patil R. Numerical investigation of nondimensional constant and empirical relation representing Nusselt profile nonuniformity. J Thermophysics Heat Transf 2020;34:215–229. [CrossRef]
• [20] Secchi F, Gatti D, Frohnapfel B. The wall-jet region of a turbulent jet impinging on smooth and rough plates. Flow Turbulence Combust 2023;110:275–299. [CrossRef]
• [21] Rathod AM, Gulhane NP, Siddique UM. Heat transfer augmentation for impingement of steady air jet under exponential heat flux boundary condition. Int J Eng 2023;37:920–930. [CrossRef]
• [22] Talapati RJ, Katti VV. Local heat transfer characteristics of circular multiple air jet impinging on a semicircular concave surface. Exp Heat Transf 2023;37:851–874. [CrossRef]
• [23] Talapati RJ, Katti VV. Influence of ratio of nozzle length to diameter on local heat transfer study of an unconfined circular air jet impingement. Int J Therm Sci 2023;183:107859. [CrossRef]
• [24] Talapati RJ, Katti VV. Influence of turbulator under the detached rib on heat transfer study of air jet impinging on a flat surface. Int J Therm Sci 2023;184:107946. [CrossRef]
• [25] Talapati RJ, Baghel K, Shrigondekar H, Katti VV. Influence of inclined unconfined circular air jet impingement on local heat transfer characteristics of smooth flat plate. Int J Therm Sci 2024;197:108848. [CrossRef]
• [26] Talapati RJ, Hiremath NS, Katti VV. Influence of nozzle geometry on wall static pressure coefficient of the submerged turbulent jet impinging on a smooth flat surface. Int J Ambient Energy 2023;44:1959–1968. [CrossRef]
• [27] Talapati RJ, Katti VV. Influence of synthetic air jet temperature on local heat transfer characteristics of synthetic air jet impingement. Int Comm Heat Mass Transf 2022;130:105796. [CrossRef]
• [28] Talapati RJ, Katti VV, Hiremath NS. Local heat transfer characteristics of synthetic air jet impinging on a smooth convex surface. Int J Therm Sci 2021;170:107143. [CrossRef]
• [29] Everts M, Meyer JP. Test sections for heat transfer and pressure drop measurements: construction, calibration, and validation. In: Meyer J, De Paepe M, eds. The Art of Measuring in the Thermal Sciences. Boca Raton: CRC Press; 2020. p. 53. [CrossRef]