Effects of rotation on the trailing vortex and heat transfer from a horizontal rotating cylinder at higher Grashof number |
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| Affiliation: | 1. Department of Paediatric and Congenital Cardiology and Cardiac Surgery, Children''s Hospital, CHU Nantes, Nantes, France;2. L''institut du thorax, INSERM, CNRS, UNIV Nantes, CHU Nantes, Nantes, France;3. Paediatric Cardiology Service, Royal Brompton Hospital, Royal Brompton and Harefield NHS Foundation Trust, London, UK;4. National Heart and Lung Institute, Imperial College, London, UK;1. School of Mechanical, Materials and Energy Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India;2. Biomedical Instrumentation Division, CSIR — Central Scientific Instruments Organisation, Sector-30C, Chandigarh 160030, India;3. School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, Sydney 2032, Australia;1. Department of Mechanical and Electromechanical Engineering, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan;2. Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India;1. Department of Mathematics, Indian Institute of Technology Madras, Chennai - 600036, India;2. Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India |
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| Abstract: | In the present study, effects of rotation on the trailing vortex and heat transfer from a large diameter horizontal rotating cylinder in still air have been experimentally investigated whereas earlier studies considered cylinders with smaller diameters. As the rotational speed n is increased, the trailing vortex would deflect in the rotational direction, the flow state of air near the cylinder would vary from laminar to turbulent, the heat transfer would transit from pure natural convection to mixed convection, and finally to pure forced convection resulted from rotation, the trailing vortex would break down and disappear. The variation of deflection angles ω with the parameter can be expressed as at lower rotational speed. The discriminant to determine the disappearance of trailing vortex can be presented as Rer2/Gr = 7.51. |
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