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Laminar Natural Convection Heat Transfer to Air from a Vertically Arranged Array of horizontal Cylinders

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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Year of Publication: 2017
Authors:
Yasin K. Salman, Humam Salih Mahdi
10.5120/ijca2017913047

Yasin K Salman and Humam Salih Mahdi. Laminar Natural Convection Heat Transfer to Air from a Vertically Arranged Array of horizontal Cylinders. International Journal of Computer Applications 160(5):1-10, February 2017. BibTeX

@article{10.5120/ijca2017913047,
	author = {Yasin K. Salman and Humam Salih Mahdi},
	title = {Laminar Natural Convection Heat Transfer to Air from a Vertically Arranged Array of horizontal Cylinders},
	journal = {International Journal of Computer Applications},
	issue_date = {February 2017},
	volume = {160},
	number = {5},
	month = {Feb},
	year = {2017},
	issn = {0975-8887},
	pages = {1-10},
	numpages = {10},
	url = {http://www.ijcaonline.org/archives/volume160/number5/27066-2017913047},
	doi = {10.5120/ijca2017913047},
	publisher = {Foundation of Computer Science (FCS), NY, USA},
	address = {New York, USA}
}

Abstract

Natural convection heat transfer to air from a bank of four horizontal aluminum cylinders vertically lined and subjected to an identical constant heat flux has been examined experimentally. Each cylinder in the bank has 30 mm outer diameter, 2 mm thickness and 400 mm in length. The investigation covered five cylinders center to center spacing (2D, 2.5D, 3D, 4D, and 5D) and five identical cylinder heat fluxes which varied the modified Rayleigh number (RaD*) from 6,1x105 to 2.0x106. The outcomes demonstrate that the local Nusselt number increases as the heat flux and cylinders center to center spacing increasing. The heat transfer results for the second, third and fourth cylinders are more down than the first cylinder heat transfer solution. The differences of the three cylinders in comparison with first cylinder are improving gradually as the cylinder center to center spacing increasing and that can be attributed to the natural convection current interaction. The temperature profile around the cylinder circumference indicates that the maximum Nusselt number occurs at θ = 0o (cylinder bottom leading edge) and the maximum surface temperature and lower Nusselt number occurs at θ =180o (top of the cylinder).. Empirical correlations were obtained for the average Nusselt number as a function of the modified Rayleigh number. Empirical formulas by which heat transfer characteristic form each individual cylinder in the array evaluated and listed in comparison with first cylinder showing the effect of cylinder center to center spacing.

References

  1. Dennis J. Wessel, George Reeves, “Ashrae Hand Book fundamentals” (2001).
  2. S. Kazemzadeh Hannani, M. S. Sadeghipour and M. Nazaktabar “Natural convection heat transfer from horizontal cylinders in a vertical array confined between parallel walls” IJE Transactions A: Basics, Vol. 15, No. 3, September (2001).
  3. S.C. Haldar, G.S. Kochhar and K. Manohar. “Numerical Study of Laminar Free Convection about a Horizontal Cylinder with Longitudinal Fins of Finite Thickness” International Journal of Thermal Sciences, (2007).
  4. M Flori and L Vîlceanu. “CFD numerical simulation of air natural convection over a heated cylindrical surface” International Conference on Applied Sciences (2014).
  5. Soroush Mirzak hanlari; Behnam pourJalal, Aran Alaie sheikhrobat, Temour Behzadi. “Numerical investigation of Natural convection heat transfer on aligned arrangement tube banks” International conference on
  6. Al-Mahroom F. G. F. (2000), “Natural Convection Heat Transfer from a Horizontal Cylinder Placed In a.
  7. O. Reymond, D. B. Murray and S. O’Donovan, (2008) “Natural Convection Heat Transfer from Two Horizontal Cylinders” Experimental Thermal and Fluid Science, vol. 32, pp: 1702-1709, June.
  8. Holman J. P. (2010). “Heat transfer”, 10th edition, McGraw-Hill Series in Mechanical Engineering,
  9. Jack P. Holman. (2011). “Experimental methods for engineers”, 8th ed. McGraw-Hill Series in Mechanical Engineering

Keywords

Natural Convection, horizontal cylinders array vertically line up, cylinder center to center spacing.