, Sonal S. More 2
, M. B. Kulkarni 3
, B. R. Birajdar 4
, A. S. Dhobale 5
, K. A. Shaikh 6
2Assistant Professor, Department of Electronic and Telecommunication Engineering, N. K. Orchid College of Eng. & Tech. Solapur, DBATU University, Gat No.16, Solapur-Tuljapur Road, Near Mashroom Ganapati Temple, Solapur, 413002, Maharashtra, India
3Assistant Professor, Department of Mechanical Engineering, N. K. Orchid College of Eng. & Tech., Solapur, DBATU University, Gat No.16, Solapur-Tuljapur Road, Near Mashroom Ganapati Temple, Solapur-413002, Maharashtra, India
4Assistant Professor, Department of Mechanical Engineering, N. K. Orchid College of Eng. & Tech., Solapur, DBATU University, Gat No.16, Solapur-Tuljapur Road, Near Mashroom Ganapati Temple, Solapur, 413002, Maharashtra, India
5Assistant Professor, Department of Mechanical Engineering, N. K. Orchid College of Eng. & Tech., Solapur, DBATU University, Gat No.16, Solapur-Tuljapur Road, Near Mashroom Ganapati Temple, Solapur, 413002, Maharashtra, India
6Assistant Professor, Department of Mechanical Engineering, N. K. Orchid College of Eng. & Tech., Solapur, DBATU University, Gat No.16, Solapur-Tuljapur Road, Near Mashroom Ganapati Temple, Solapur, 413002, Maharashtra, India
Abstract
Improvement in heat-transfer performance is a major requirement in contemporary thermal management systems, particularly in high-heatflux applications. The application of nanofluids combined with surface modification methods has emerged as a viable measure to counter the
shortcomings of traditional heat-transfer fluids. This study experimentally investigates the effects of nanoparticle concentration and surface geometry on convective heat-transfer characteristics. Graphene nanofluids with three volume fractions (0.2, 0.5, and 1) were prepared, and experiments were conducted on plain, V-structured, and square-structured surfaces. Thermal transfer properties were measured at heat inputs of 56 W, 72 W, and 90 W. The results show that the volume fraction of nanoparticles in the suspension always increases with the heat transfer
coefficient, irrespective of surface arrangement. The heat transfer coefficient was also high for heat input at a given volume fraction. Structured surfaces exhibited substantially better thermal performance than plain surfaces because they more effectively disrupted the thermal boundary
layer and induced greater flow disturbance. The heat transfer coefficient of the plain surface at a nanoparticle volume fraction of 1 percent and a heat input of 90 W was 28.19 W/m2oC, the V-structured and square-structured surfaces recorded 36.145 W/m2oC and 52.21 W/m2oC, respectively. This corresponds to heat transfer improvements of 28.2% and 85.20% on the V-structured and square-structured surfaces, respectively, compared with the plain surface. The research proves that the hybrid application of graphene-based nanofluids and surface structuring significantly enhances the heat-transfer performance and that surface structuring with the square form is most promising for high-end thermal-performance applications. The novelty of the present work lies in experimentally comparing pool-boiling heat-transfer performance of graphene nanofluids on plain, V-grooved, and square-structured heating surfaces under identical test conditions, thereby highlighting the influence of simple, manufacturable surface geometries on boiling enhancement.
