Numerical Investigation of Heat Transfer Between Gaps of Concentric Imperfect Cones

The behavior of the flow between two coaxial conical cylinders with the inner one rotating and the outer one stationary is studied numerically. The angular velocity of the inner cone cylinder was raised step by step from the rest until reaching its final speed. In this work we first present a numerical simulation of the flow characteristics and the heat transfer mechanism of a fluid in the space between the two incomplete coaxial rotating cones. The problem is studied when the heated inner wall which rotates around the common axis with constant angular velocity and outer wall is at rest in the constant temperature, endplates are assumed adiabatic. The unsteadiness and the rotational speeds of such flows make them highly turbulent and thus challenging to predict by numerical simulations. Computational Fluid Dynamics (CFD) provides detailed insight for these types of flows, at a cheaper cost than experimental studies, thus allowing engineers to quickly improve the design of rotating machines. Governing equation and numerical simulation of the problem are carried out by using the commercial CFD code and the effects of the different parameters on the heat transfer and flow are considered. This condition such as local and average radial Nusselt number is computed with axial and rotational Reynolds numbers in low Prandtl number (Pr).The axial Reynolds numbers is 30-1200 and rotational Reynolds numbers are 30-2922.