Flow and Heat Transfer from Rotating Horizontal Cylinder Floating in Stationary Fluid

Abstract

This paper investigates the flow and heat transfer from a rotating horizontal cylinder floating in a stationary fluid. The aim is to elucidate the role of angular velocity and immersion angle on heat transfer performance and fluid behavior in the flowfield. The cylinder surface has a constant temperature of 333 K, whereas the surrounding fluids are in initial thermal equilibrium at a temperature of 293 K, and the adiabatic assumption is applied to the tank walls. The results illustrate that the rotation of the cylinder causes the formation of vortices in a fluid that has a higher contact surface with the cylinder. Also, the highest-temperature gradient is observed adjacent to the surface of the cylinder. Based on the results, the creation of a liquid film on the upper surface of the cylinder exhibits a positive dependence on the angular velocity, irrespective of the immersion angle. The film thickness decreases continuously in the direction of cylinder rotation. Furthermore, increasing the immersion angle leads to an increase in the thickness and flow of the liquid film. Scrutiny of the results indicates that increasing the angular velocity and immersion angle always improves heat transfer from the surface of the cylinder.