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research-article

Buoyancy Induced Natural Convective Heat Transfer along a Vertical Cylinder using Water/Al2O3 nanofluids

[+] Author and Article Information
Ravi Babu Sajja

Faculty, Department of Power Engg, GMR Institute of Technology, GMR Nagar, Rajam, Srikakulam (dt), Andhrapradesh, India, 532127
ravibabu.s@gmrit.org

Sambasiva rao G

Professor & Principal, Sir.C.R.Reddy College of Engineering, Eluru, Andhrapradesh, India, 534007
gutta39@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4038701 History: Received March 01, 2017; Revised October 23, 2017

Abstract

Buoyancy-induced natural convective heat transfer along a vertical cylinder immersed in Water- Al2O3 nanofluids for various concentrations (0, 0.05, 0.1, 0.2, 0.4, 0.6 Vol %) under constant heat flux condition is investigated experimentally and presented. Thermal stratification was observed outside the boundary layer in the ambient fluid after steady state condition is achieved as the fluid temperature goes on increasing along the axial direction. Temperature variations of the cylinder along the axial direction, temperature variations of fluid in both axial and radial direction are shown graphically. It is observed that the temperatures of the cylinder and the fluid increases along the axial direction and the fluid temperature decreases in the radial direction. Experiments were conducted for different heat inputs (30W, 40W, 45W and 50W) and different volume concentrations and observed that the addition of alumina nanoparticles up to 0.1 vol % enhances the thermal performance and then the further addition of nanoparticles leads to deterioration. The maximum enhancement in the natural convection heat transfer performance is observed as 18%.

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