Effects of viscous dissipation and fluid axial heat conduction on heat transfer for non-Newtonian fluids in ducts with uniform wall temperature: Part II. Annular ducts |
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| Affiliation: | 1. Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan;2. Department of Mechanical Systems Engineering, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan;1. Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan 689-798, Republic of Korea;2. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan 689-798, Republic of Korea;1. Soft Matter Rheology and Technology, Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, P.B. 2424, B-3001 Leuven, Belgium;2. Polymer Technology, Department of Mechanical Engineering, TU Eindhoven, P.B. 513, 5600 MB Eindhoven, The Netherlands;3. Surface and Interface Engineered Materials, Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, P.B. 2450, B-3001 Leuven, Belgium;4. Soft Matter and Biophysics Section, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, P.B. 2416, B-3001 Leuven, Belgium;1. Department of Chemistry, NIS (Nanostructured Interfaces and Surfaces) Interdepartmental Centre and INSTM Centro di Riferimento, University of Torino, Via P. Giuria, 7, 10125 Torino, Italy;2. Proplast, Strada Comunale Savonesa 9, 15057 Rivalta Scrivia, AL, Italy;3. ECNP, Strada Comunale Savonesa 9, 15057 Rivalta Scrivia, AL, Italy;4. Materials Engineering Center, UdR INSTM, University of Perugia, Str. Pentima 4, 05100 Terni, Italy;1. Dpt. Materials Science and Engineering and Chemical Engineering and IQMAAB, Universidad Carlos III de Madrid, Av. Universidad 30, 28911 Leganés, Madrid, Spain;2. Departamento de Ingeniería Eléctrica, Universidad Carlos III de Madrid, Av. Universidad 30, 28911 Leganés, Spain;3. Departamento de Química y Edafología, Universidad de Navarra, Spain;1. University Institute of Engineering & Technology, Panjab University, Chandigarh 160014, India;2. Indian Institute of Technology Ropar, Punjab, 140001, India;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, PR China;2. CSIRO Materials Science and Engineering, PO Box 21, Belmont, VIC 3216, Australia |
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| Abstract: | The present paper, which is an extension of a previous study O. Jambal, T. Shigechi, D. Ganbat, S. Momoki, Int. Commun. Heat Mass Transf. 32(9) (2005) 1165] on laminar heat transfer to non-Newtonian fluids in parallel plates and circular ducts, deals with concentric annular ducts subjected to a step change in wall temperature. A finite-difference scheme is applied to determine the velocity and temperature fields. Developing Nusselt numbers are graphically shown for various Brinkman numbers and Peclet numbers and the effects of viscous dissipation, fluid axial heat conduction, non-Newtonian behavior together with the radius ratio effect on heat transfer are discussed. |
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