Vol. 23 No. 1 (2020) Cover Image
Vol. 23 No. 1 (2020)

Published: March 31, 2020

Pages: 51-60

Articles

Free Convection Heat Transfer Around a Cylinder Embedded in an Enclosure Filled with Porous Media

Suhad A. Rasheed 1 Abeer Aamer Mahmood 2
1 Mech. Eng. Dept., University of Technology, Baghdad, Iraq
2 ) Mech. Eng. Dept., University of Technology, Baghdad, Iraq
History
  • Received: October 25, 2019
  • Revised: December 28, 2019
  • Accepted: January 29, 2020
  • Available Online: March 20, 2020
DOI

https://doi.org/10.29194/NJES.23010051

Abstract

An experimental and theoretical study of free convection heat transfer for a cylinder placed in an iron test section of dimensions  (0.2x0.2x0.2 m3), the test section filled with saturated porous material glass balls   (5 mm), and the air is the working fluid with Raleigh number (7692.6 ? Ra ? 17654). The circular cylinder heater (D = 0.015 m, L = 0.2 m) is heated electrically, made of Copper and located in different positions (in X & Y direction). The theoretical part includes solving the free convection heat transfer using the ANSYS program (fluent). The experimental and theoretical results showed that the surface temperature values around the cylinder perimeter when changing its position within the test section are changing as moving up and down where the effect of buoyancy force appears. The maximum difference between the upper and lower position at the experimental result is 7.22%, and the average Nusselt number increases with Raleigh number and heat flux. Also, the experimental results showed that the use of porous material significantly improves the heat transfer by 48.6%. The maximum percentage change between the experimental and theoretical results is 5.46%. Moreover, experimental correlations were achieved, and a comparison was performed between the present results with the previous studies and it gives a good agreement.

Keywords

References

  1. Kaviany, M, 1998, “Principles of Heat Transfer in Porous Media” Chap.1-2, Second edition, the university of Michigan.
  2. Bejan, A., 2003, “Convection Heat Transfer”, Chap. 10, John Wiley and Sons Ins., 1984.
  3. Omar Rafae Alomar" Numerical Study of Inertia Effect on Natural Convection in A Horizontal Porous Cavity", M.Sc. Thesis, Mosul Univ, Iraq.
  4. Nawaf H. Saeid,” Analysis of free convection about a horizontal cylinder in a porous media using a thermal non-equilibrium model” International Communications in Heat and Mass Transfer 33 (2006) 158–165.
  5. M. Ashjaee,” Experimental Study of Free Convection Heat Transfer from Horizontal Isothermal Cylinders Arranged in Vertical and Inclined Arrays”, Heat Transfer Engineering, 28(5):460–471, 2007.
  6. Yorwearth L. Jamin,” Natural Convection Heat Transfer Enhancements from a Cylinder Using Porous Carbon Foam: Experimental Study”, Journal of Heat Transfer, 2008, Vol. 130 / 122502-1.
  7. Ş. Özgür Atayılmaz, “Experimental and numerical study of the natural convection from a heated horizontal cylinder”, International Communications in Heat and Mass Transfer 36 (2009) 731–738
  8. اﺣﻣد ﺣﺳن اﺣﻣد اﺑراﻫﯾم," دارﺳﺔ ﻧظرﯾﺔ وﻋﻣﻠﯾﺔ ﻻﻧﺗﻘﺎل اﻟﺣرارة ﺑﺎﻟﺣﻣل اﻟﺣر ﻣن اﺳطواﻧﺔ أﻓﻘﯾﺔ ﻣﻐﻣورة ﺑوﺳط ﻣﺳﺎﻣﻲ ﻣﺷﺑﻊ", مجلة ديالى للعلوم الهندسية, المجلد الرابع, العدد الاول, صفحات البحث (1-19), حزيران 2011
  9. P. Nagaraju, “Studies on heat and mass transfer problems in saturated porous media”, university grants commission, MRP(s)-165/08-09, 3/4/2009.
  10. E. Shakeri, “Free Convection Heat Transfer over a Vertical Cylinder in a Saturated Porous Medium Using a Local Thermal Non-equilibrium Model”, p.p 93:453–460, 24 February 2012.
  11. Stig Grafsrønningen, ”Natural convection heat transfer from three vertically arranged horizontal cylinders with dissimilar separation distance at moderately high Rayleigh numbers”, International Journal of Heat and Mass Transfer 57 (2013) 519–527.
  12. Anna A.Bocharova and Irina V. Plaksina,” Convection Heat Transfer on a Vertical Surface in Porous Media”, Vol. 685, pp 272-275, 2016.
  13. Sandra Corasaniti and Fabio Gori,” Natural convection around a vertical cylinder (thermal probe) immersed in a porous medium”, International Communications in Heat and Mass Transfer, 81 (2017) 72–78.
  14. Hosny Abou-Ziyan,” Experimental Investigation of Free Convection from Short Horizontal Cylinder to Newtonian and Power-Law Liquids of Large Prandtl Numbers”, Experimental Thermal and Fluid Science (2017).
  15. Ahmed H. Ahmed, ” Forced Convection about a Horizontal Cylinder Embedded in a Porous Medium” Foundation of Technical Education- Technical Institute Hawija Journal of Kirkuk University - Scientific Studies, Iraq, Vol.5, No.2, 2010.
  16. Zaid Salman Ubaid, 2019, “numerical and experimental study of using different cooling method for photovoltaic panel”, M.Sc. University of Technology Iraq.
  17. Qahtan, A. Flaiyh, 2005" Forced Convection Heat Transfer Through and over porous layer on a heated wall at constant temperature”, M.Sc. University of Technology Iraq.