Mechanical Engineering, Renewable Energy, Sustainability and the Environment, Aerospace Engineering
8
Scopus Publications
Scopus Publications
Jet impingement heat transfer characteristics of round surface geometries: A review Santosh B. Bopche, Chidanand K. Mangrulkar, Sangamesh C. Godi, Suraj Vairagade, Arunkumar H S Results in Engineering, 2025 Jet impingement cooling over curved and round geometries plays a pivotal role in advanced thermal management systems ranging from gas turbines and electronics to solar energy and nuclear applications. Despite extensive research, existing studies remain fragmented, often restricted to isolated parameters such as jet spacing, Reynolds number, or surface curvature, leaving a lack of unified understanding across geometries, operating regimes, and enhancement techniques. This review systematically consolidates experimental, numerical, and empirical investigations covering concave, convex, cylindrical, spherical, and rotating surfaces, as well as modern advancements including mist-assisted cooling, rib-roughened targets, oblique jets, and microchannel integrations. Comparative analysis reveals how curvature ratio, jet inclination, inlet temperature, confinement, and nozzle geometry collectively influence stagnation-zone heat transfer, secondary peak formation, and thermal uniformity. Recent studies highlight the transformative potential of hybrid strategies—such as combining mist cooling with structured surfaces or optimizing multi-jet arrays via high-fidelity simulations—to achieve up to 200 % improvement in heat transfer performance. However, critical gaps persist in transient, multi-physics, and high-temperature applications, as well as in developing generalized correlations coupling flow, thermal, and geometric parameters. Addressing these gaps through integrated experiments, advanced turbulence modeling, and data-driven optimization frameworks offers a clear roadmap for next-generation cooling technologies.
Evaluation of candidate strategies for the estimation of local heat transfer coefficient from wall jets Sangamesh C. Godi, Satyanand Abraham, Arvind Pattamatta, C. Balaji Experimental Heat Transfer, 2020 This paper reports results of experimental investigations on planar and three-dimensional wall jets over a flat surface. The local heat transfer coefficient is estimated at transient conditions with a semi-infinite approximation and at steady state conditions with a uniform wall heat flux boundary. Liquid crystal thermography and infrared thermography are used to map the surface temperatures. Experiments are performed for 2000 Re 8000 and 0 x/L 80. Results show that transient infrared thermography with semi-infinite approximation is a better candidate for the estimation of the heat transfer coefficient from wall jets.
Effect of the inlet geometry on the flow and heat transfer characteristics of three-dimensional wall jets Sangamesh C. Godi, Arvind Pattamatta, C. Balaji Journal of Heat Transfer, 2019 In this work, fluid flow and heat transfer characteristics of three-dimensional (3D) wall jets exiting from a circular and square opening are presented based on experimental investigations. Two hydraulic diameters, namely, 2.5 and 7.5 mm and a Reynolds number range of 5000–20,000 have been considered. Mean velocity and turbulence intensity distribution in the walljet are quantified using a hot wire anemometry. Measurements are done both along the streamwise and spanwise directions. Transient infrared thermography is used for mapping the temperatures over the surface, and the heat transfer coefficients are estimated using a semi-infinite approximation methodology. Results show that, for circular jets, the effect of the jet diameter on the local and the spanwise-averaged Nusselt number is most pronounced near the jet exit. Further, it is also observed that circular jets have an edge over square jets. A correlation with a high correlation coefficient of 0.95 has been developed for spanwise average Nusselt number as a function of the Reynolds number and the dimensionless streamwise distance.
