THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL STUDY OF THE EFFECTS OF A VERTICAL CHANNEL ON THE NATURAL CONVECTION OF A HORIZONTAL CYLINDER

ABSTRACT
In this study, the natural convective flow and heat transfer from a hot horizontal cylinder surrounded by two vertical plates with a negligible thickness was experimentally investigated. These plates act as a channel so that the natural convective flow of the hot cylinder passes through this channel. The flow field was visualized using particle image velocimetry technique to investigate the effect of changing, the width of the channel, and the height of the water free surface on the flow behavior. In each case, by changing the mentioned geometric parameters, flow velocity at the top of the cylinder, temperature of the cylinder surface, volume flow rate of the channel, the structure and location of vortices, and flow pat-tern inside the channel were studied. The results show that the flow is appropriately formed around the cylinder and inside the channel when both the free sur-face height above the channel and the channel width are twice the cylinder diameter. Also, the cylinder Nusselt number is increased for the channel with a width ratio of 2, relative to the case without channel around the cylinder.
PAPER SUBMITTED: 2019-06-30
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2020-02-24
PUBLISHED ONLINE: 2020-03-08
DOI REFERENCE: https://doi.org/10.2298/TSCI190630091A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 3, PAGES [1935 - 1948]
REFERENCES
  1. Nakamura, H., Asako, Y., Laminar Free Convection from a Horizontal Cylinder with Uniform Cross-section of Arbitrary Shape, Bulletin of JSME, 21 (1978), 153, pp. 471-478
  2. Haldar, S. C., Laminar Free Convection Around a Horizontal Cylinder with External Longitudinal Fins, Heat Transfer Engineering, 25 (2004), 6, pp. 45-53
  3. Kumar-De, A., Dalal, A., A Numerical Study of Natural Convection around a Square, Horizontal, Heated Cylinder Placed in an Enclosure," International Journal of Heat and Mass Transfer, 49 (2206). 23-24, pp. 4608-4623
  4. Huynh, P., Cooling By Free Convection at High Rayleigh Number of Cylinders Positioned Above a Plane, Proceedings, 16th Australasian Fluid Mechanics Conference, Australia, 2007, pp. 654-658
  5. Saha, S., et al., Natural Convection in Square Enclosure with Adiabatic Cylinder at Center and Discrete Bottom Heating, International University Journal of Science and Technology, 3 (2008), Jan., pp. 29-36
  6. Yu, Z.-T., et al., Transient Natural Convective Heat Transfer from a Heated Triangular Cylinder to its Air-Filled Coaxial Cylindrical Enclosure, International Journal of Heat and Mass Transfer, 53 (2010), 19-20, pp. 4296-4303
  7. Yu, Z. T., et al., Unsteady Natural Convection Heat Transfer from a Heated Horizontal Circular Cylinder to Its Air-Filled Coaxial Triangular Enclosure, International Journal of Heat and Mass Transfer, 54 (2011), 7-8, pp. 1563-1571
  8. Karimi, F., et al., Numerical Simulation of Unsteady Natural Convection from Heated Horizontal Circular Cylinders in a Square Enclosure, Numerical Heat Transfer, Part A: Applications, 65 (2014), 8, pp. 715-731
  9. Rabani, R., Talebi, F., Free Convection from a Partially Heated Circular Cylinder inside a Square Enclosure, Progress in Computational Fluid Dynamics, an International Journal, 15 (2015), 6, pp. 372-387
  10. Ashjaee, M., et al., Free Convection Heat Transfer from a Confined Horizontal Elliptic Cylinder, Heat Transfer Engineering, 27 (2006), 10, pp. 116-124
  11. Ashjaee, M., et al., An Empirical Correlation for Natural Convection from Confined Elliptic Tube," Experimental Heat Transfer, 20 (2007), 3, pp. 213-228
  12. Ashjaee, M., et al., Experimental Investigation on Free Convection from a Horizontal Cylinder Located above an Adiabatic Surface, Proceedings, 4th International Conference on Thermal Engineering: Theory and Applications, Abu Dhabi, UAE, 2009
  13. Karami, A., et al., Modeling of the Free Convection Heat Transfer From an Isothermal Horizontal Cylinder in a Vertical Channel Via the Fuzzy Logic, The International Journal of Multiphysics, 6 (2012), 1, pp. 7-16
  14. Svarc, P., Dvorak, V., Numerical and Experimental Studies of Laminar Natural Convection on a Horizontal Cylinder, Engineering Mechanics, 20 (2013), 3-4, pp. 177-186
  15. Grafsronningen, S., et al., PIV Investigation of Buoyant Plume from Natural Convection Heat Transfer above a Horizontal Heated Cylinder, International Journal of Heat and Mass Transfer, 54 (2011), 23-24, pp. 4975-4987
  16. Grafsronningen, S., Jensen, A., Simultaneous PIV/LIF Measurements of a Transitional Buoyant Plume above a Horizontal Cylinder, International Journal of Heat and Mass Transfer, 55 (2012), 15-16, pp. 4195-4206
  17. Persoons, T., et al., Natural Convection Heat Transfer and Fluid Dynamics for a Pair of Vertically Aligned Isothermal Horizontal Cylinders, International Journal of Heat and Mass Transfer, 54 (2011), 25-26, pp. 5163-5172
  18. Marsters, C. F., Natural Convective Heat Transfer From a Horizontal Cylinder in the Presence of Nearby Walls, The Canadian Journal of Chemical Engineering, 53 (1975), 1, pp. 144-149
  19. Al-Alusi, T. R., An Experimental Study of Natural Convection Heat Transfer From a Horizontal Cylinder Array Vertically Aligned to and Confined by a Single Wall and Two Walls, Ph.D. thesis, Mechanical Engineering, Oregon State University, Corvallis, Ore., USA, 1989
  20. Saha, A. K., Unsteady Free Convection in a Vertical Channel with a Built-in Heated Square Cylinder, Numerical Heat Transfer, Part A: Applications, 38 (2000), 8, pp. 795-818
  21. Moulai, S., et al., Buoyancy-Assisted Mixed Convection Flow over a Heated Square Cylinder on a Vertical Channel, Proceedings, 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT2014), Orlando, Fla., USA, 2014
  22. Mathis, P., et al., Heat Transfer Enhancement of Free Convection Flows in Vertical 2D channels With Kármán Vortex Streets : An Experimental Study, Proceedings, 12th REHVA World Congress / Per Heiselberg - organizer, Seiten/Artikel-Nr: 9 Seiten, Aalborg, Denmark, 2016
  23. Samish, M. F., Mahendra, P. N., Parametric Studies on Heat Transfer by Natural Convection from Inclined Cylinder Placed in Vertical Channel - an Overview," International Research Journal of Engineering and Technology (IRJET), 04 (2017), 02, pp. 355-360
  24. Taherian, G., et al., Flow Visualization over a Thick Blunt Trailing-Edge Airfoil with Base Cavity at Low Reynolds Numbers Using PIV Technique, Journal of Visualization, 20 (2017), 4, pp. 695-710
  25. Karbasi Pour, M., et al., Experimental Study of Natural Convective Flow over a Hot Horizontal Rhombus Cylinder Immersed in Water via PIV Technique, Journal of Applied Fluid Mechanics, 10 (2017), 2, pp. 735-747

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence