Unsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet in hybrid nanofluid exhibiting slip effect

• Published in: AIP Conference Proceedings
• Main Author: Dzulkifli N.F.; Najib N.; Bakar N.A.A.
• Format: Conference paper
• Language: English
• Published: American Institute of Physics 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85202635477&doi=10.1063%2f5.0225098&partnerID=40&md5=0a01e2e50fcf6b23d4434f6bd507b30a

This study focuses on the investigation of unsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet immersed in a hybrid nanofluid. Hybrid nanofluid is an engineered fluid and can enhance thermal conductivity and heat transfer efficiency and stagnation-point flow is important in designing heat exchangers. Hence, the heat exchange process such as in power generation, and refrigeration becomes more effective. This mathematical model applied the Tiwari and Das model where Al2O3 - Cu hybrid nanofluid is considered. The base fluid is water, and the shape of the nanoparticle is considered in sphere shape. The ordinary differential equations are solved using the bvp4c function in the Matlab program to obtain the skin friction coefficient, heat transfer rate as well as velocity and temperature profiles. This study provides some tables of the skin-fiction coefficients and heat transfer rate values for the validation with the previous study and new values for the future study. This study reveals that dual solutions exist for suction s > sc. The increase of copper nanoparticles expands the solution and increases the skin friction coefficient at the surface. Meanwhile, by considering the higher effect of the slip parameter, the findings show an increment in both skin friction coefficient and heat transfer rate at the surface. The heat transfer rate is seen increasing by considering the same value of nanoparticle Volume fraction for copper and alumina compared to the different values. © 2024 Author(s).