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Thermal Science 2022 Volume 26, Issue 5 Part B, Pages: 4193-4206
https://doi.org/10.2298/TSCI210706005D
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Experimental investigation of thermophysical properties and heat transfer characteristics of hybrid nanofluids based on particle size

Dhairiyasamy Ratchagaraja (Department of Mechanical Engineering, University College of Engineering, Villupuram, Tamilnadu, India), ratchagaraja@gmail.com
Ahmed Mohamed H. (Mechanical Engineering Department, King Abdulaziz University, Jeddah, Saudi Arabia + Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt)
Abdelrhman Yasser (Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt)
Afzal Asif (Department of Mechanical Engineering, P.A. College of Engineering (Affiliated to Visvesvaraya Technological University, Belagavi), Mangaluru, India + Department of Mechanical Engineering, School of Technology, Glocal University, Delhi-Yamunotri Marg, Mirzapur Pole, Saharanpur District, Uttar Pradesh, India)
Essa Fadl A. (Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Egypt)
Alsehli Mishal (Mechanical Engineering Department, College of Engineering, Taif University, Taif , Saudi Arabia)
Aly Ayman A. (Mechanical Engineering Department, College of Engineering, Taif University, Taif, Saudi Arabia)
Saleh Bahaa (Mechanical Engineering Department, College of Engineering, Taif University, Taif, Saudi Arabia)

In heat transfer applications, nanofluids are utilized to increase thermal conductivity and heat transfer coefficient. The difficulty of nanoparticle stabilization in the fluids is a significant problem in heat transfer applications. Heat exchanger materials may wear and erode as a result of the additional nanoparticle. When compared to mono nanofluids, this can be lowered by using hybrid nanofluids. In this work, hybrid nanofluids are used in a radiator under laminar flow at 75°C, and the effect of volume concentration on heat transfer enhancement is investigated. The thermophysical characteristics of hybrid nanofluids are investigated using SiC and Al2O3 at 0.1 vol.% and 0.2 vol.%. The results revealed that a hybrid nanofluid with a higher volume concentration improves heat transfer. Finally, regression analysis for laminar flow is carried out and correlations for experimental Nusselt number and friction factor values were developed. The impact of particle size, flow rate, and temperature on the radiator’s heat transfer enhancement is investigated using hybrid nanofluid at 75°C. It is observed that the size of the nanoparticle has a substantial effect on heat transfer characteristics. It is concluded that using smaller-sized hybrid nanoparticles of Al2O3/SiC-S with less volume concentration enhances heat transfer and reduces radiator size compared to conventional coolants.

Keywords: Hybrid nanofluids, Heat transfer coefficient, Nusselt number, friction factor, Radiator

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