Thermofluid Characteristics on Natural and Mixed Convection Heat Transfer From a Vertical Rotating Hollow Cylinder Immersed in Air: A Numerical Exercise

Author:

Rana Basanta Kumar1,Singh Bhajneet2,Senapati Jnana Ranjan3

Affiliation:

1. School of Mechanical Engineering, Kalinga Institute of Industrial Technology, Deemed to be University, Bhubaneswar 751024, India

2. Department of Mechanical Engineering, G B Pant Government Engineering College, New Delhi 110020 India

3. Department of Mechanical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India

Abstract

Abstract Numerical investigations are performed on natural and mixed convection around stationary and rotating vertical heated hollow cylinder with negligible wall thickness suspended in the air. The fluid flow and heat transfer characterization around the hollow cylinder are obtained by varying the following parameters, namely, Rayleigh number (Ra), Reynolds number (ReD), and cylindrical aspect ratio (L/D). The heat transfer quantities are estimated by varying the Rayleigh number (Ra) from 104 to 108 and aspect ratio (L/D) ranging from 1 to 20. Steady mixed convection with active rotation of hollow vertical cylinder is further studied by varying the Reynolds number (ReD) from 0 to 2100. The velocity vectors and temperature contours are shown in order to understand the fluid flow and heat transfer around the vertical hollow cylinder for both rotating and nonrotating cases. The surface average Nusselt number trends are presented for various instances of Ra, ReD, and L/D and found out that the higher rate of heat loss from the cylinder wall occurs at high Ra, low L/D (short cylinder) and high ReD.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference35 articles.

1. Heat Transfer by Free Convection From Heated Vertical Surfaces to Liquids;Trans. ASME,1948

2. Natural-Convection Heat Transfer at Reduced Pressure-Spheres and Cylinders;Chem. Eng. Prog.,1953

3. Laminar Free Convection Heat Transfer From the Outer Surface of a Vertical Circular Cylinder;Trans. ASME,1956

4. Experimental Studies of Free Convection Heat Transfer;Bull. JSME,1959

5. Mixed Convection Along Slender Vertical Cylinders With Variable Surface Temperature;Int. J. Heat Mass Transfer,1989

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