ABSTRACT
This paper examines the effects of thermal buoyancy on momentum and heat transfer characteristics of symmetrically and asymmetrically confined cylinder submerged in incompressible Poiseuille liquid. The detailed flow and temperature fields are visualized in term of streamlines and isotherm contours. The numerical results have been presented and discussed for the range of conditions as 10 ≤ Re ≤ ≤ 40, Richardson number 0 ≤ Ri ≤ 4, and eccentricity factor 0 ≤ ε ≤ 0.7 at Prandtl number Pr = 1, and blockage ratio B = 20%. The representative streamlines and isotherm patterns are presented to interpret the flow and thermal transport visu¬alization. When the buoyancy is added, it is observed that the flow separation di¬minishes gradually and at some critical value of the thermal buoyancy parameter it completely disappears resulting a creeping flow. Additionally, it is observed that the down vortex requires more heating in comparison to upper vortex in order to be suppressed. In the range 1.5 ≤ Ri ≤ 4, two counter rotating regions appear above the cylinder and on the down channel wall behind the cylinder. The total drag coefficient, CD, increases with increasing Richardson number at (ε = 0). Moreover, an increase in eccentricity factor from 0 to 0.3 increases CD by 37% at Re = 10, and 30% at Re = 20 for Ri = 4. An increase in eccentricity factor form 0 to 0.4 increases local Nusselt number by 20.4% at Re = 10, and 18.6% at Re = 30 for Ri = 4.
KEYWORDS
PAPER SUBMITTED: 2016-04-24
PAPER REVISED: 2016-07-20
PAPER ACCEPTED: 2016-07-21
PUBLISHED ONLINE: 2016-08-07
THERMAL SCIENCE YEAR
2018, VOLUME
22, ISSUE
Issue 2, PAGES [821 - 834]
- Ribeiro, V. M., et al., Viscoelastic Fluid Flow Past a Confined Cylinder: Three-Dimensional Effects and Stability, Chemical Engineering Science, 111 (2014), May, pp.364-380
- Valipour, M. S., et al., A Numerical Study on Convection around a Square Cylinder Using Al2O3-H2O Nanofluid, Thermal Science, 18 (2014), 4, pp. 1305-1314
- Dhiman, A. K., et al., Steady Flow Across a Confined Square Cylinder: Effects of Power-Law Index and Blockage Ratio, J. Non-Newtonian Fluid Mech., 148 (2008), 1-3, pp. 141-150
- Greenblatt, D., Wygnanski, I. J., The Control of Flow Separation by Periodic Excitation, Prog. Aerosp. Sci., 36 (2000), 7, pp. 487-545
- Chatterjee, D., Raja, M., Mixed Convection Heat Transfer Past In-Line Square Cylinder in Vertical Duct, Thermal Science, 17 (2013), 2, pp. 567-580
- Sasmal, C., Chhabra, R. P., Effect of Aspect Ratio on Natural Convection in Power-Law Liquids from a Heated Horizontal Elliptic Cylinder, Int. J. of Heat and Mass Transfer, 55 (2012), 17-18, pp. 4886-4899
- Mohammed, H. A., Salman, Y. S., Numerical Study of Combined Convection Heat Transfer for Thermally Developing upward Flow in Vertical Cylinder, Thermal Science, 12 (2008), 2, pp. 89-102
- Nirmalkar, N., Chhabra, R. P., Forced Convection in Power-Law Fluids from an Asymmetrically Confined Heated Circular Cylinder, In. J. of Heat and Mass Transfer, 55 (2012), 1-3, pp. 235-250
- Lin, Y. M., Wu, G. H., et al., Non-Isothermal Flow of a Polymeric Liquid Passing an Asymmetrically Confined Cylinder, In. J. of Heat and Mass Transfer, 47 (2004), 8-9, pp. 1989-1996
- Subbarao, A., et al., Modelling Laminar Transport Phenomena in a Casson Rheological Fluid from an Isothermal Sphere with Partial Slip, Thermal Science, 19 (2015), 5, pp. 1507-1519
- Chatterjee, D., Mondal, B., Forced Convection Heat Transfer from an Equilateral Triangular Cylinder at Low Reynolds Numbers, Heat Mass Transfer, 48 (2012), 9, pp. 1575-1587
- Chandra, A., Chhabra, R. P., Flow and Forced Convection Heat Transfer in Newtonian Fluids from a Semi-Circular Cylinder, International Journal of Heat and Mass Transfer, 54 (2011), 1-3, pp. 225-241
- Taymaz, I., et al., Numerical Investigation of Incompressible Fluid Flow and Heat Transfer around a Bluff Bodies in Channel, Thermal Science, 19 (2015), 2, pp. 537-547
- Jahromi, J. A., et al., Effects of Inclination Angle on the Steady Flow and Heat Transfer of Power-Law Fluids around a Heated Inclined Square Cylinder in a Plane Channel, J. of Non-Newtonian Fluid Mechanics, 166 (2011), 23-24, pp. 1406-1414
- Soares, A. A., Ferreira, J. M., Effect of Temperature-Dependent Viscosity on Forced Convection Heat Transfer from a Cylinder in Cross Flow of Power-Law Fluids, Int. J. of Heat and Mass Transfer, 53 (2010), 21-22, pp. 4728-4740
- Krishnan, S., Aravamudan, K., Simulation of Non-Newtonian Fluid Food Particle Heat Transfer in the Holding Tube Used in Aseptic Processing Operations, Food and Bioproducts Processing, 9 (2013), 1, pp. 129-148
- Rashidi, S., et al., Structural Optimization of Nanofluid Flow around an Equilateral Triangular Obstacle, Energy, 88 (2015), Aug., pp. 385-398
- Rashidi, S., Esfahani, J. A., The Effect of Magnetic Field on Instabilities of Heat Transfer from an Obstacle in a Channel, Journal of Magnetism and Magnetic Materials, 391 (2015), Oct., pp. 5-11
- Bovand, M., et al., Enhancement of Heat Transfer by Nanofluids and Orientations of the Equilateral Triangular Obstacle, Energy Conversion and Management, 97 (2015), June, pp. 212-223
- Merkin, J. H., Mixed Convection from a Horizontal Circular Cylinder, Int. J. Heat Mass Transfer, 20 (1977), 1, pp. 73-77
- Sarkar, A., et al., Unsteady Wake Dynamics and Heat Transfer in Forced and Mixed Convection Past a Circular Cylinder in Cross Flow for High Prandtl Numbers, J. of Heat and Mass Transfer, 54 (2011), 15-16, pp. 3536-3551
- Sukesan, M. K., Dhiman, A. K., Laminar Mixed Convection in a Chanel with a Build-In Semi-Circular Cylinder under the Effect of Cross-Buoyancy, International Communications in Heat and Mass Transfer, 58 (2014), Nov., pp. 25-32
- Chatterjee, D., Amiroudine, S., Two-Dimensional Mixed Convection Heat Transfer from Confined Tandem Square Cylinder in Cross-Flow at Low Reynolds Number, International Communications in Heat and Mass Transfer, 37 (2010), 1, pp. 7-16