Numerical Study of Mixed Convection in Baffled Vented Cavity

Yawovi Nougbléga^1, , Koffi Sagna² and Kossi Atchonouglo¹

¹Laboratoire Sur l’Energie Solaire /Groupe Phénomène de Transfert et Energétique - Université de Lomé

²Laboratoire Sur l’Energie Solaire /Chair Unesco sur les Energies Renouvelables - Université de Lomé

Cite this paper:
Yawovi Nougbléga, Koffi Sagna and Kossi Atchonouglo. Numerical Study of Mixed Convection in Baffled Vented Cavity. International Journal of Physics. 2020; 8(1):1-10. doi: 10.12691/ijp-8-1-1

Abstract

Mixed convection is numerically studied in a baffled vented cavity with constant heat flux from a uniformly heated left vertical wall. An external airflow enters the cavity through the inlet opening in the right vertical wall and exits from the outlet opening in the opposite wall. The two-dimensional mathematical model includes a system of five governing partial differential equations of continuity, linear momentum and energy, discretized by the finite difference method, and solved by the Thomas algorithm and the Gauss Seidel Method. Flow and thermal fields are investigated by numerical simulations of air cooling with a Reynolds number in the range 10 ≤ Re ≤ 200, and Rayleigh number: 10⁴ ≤ Ra ≤ 10⁶. Three different locations of the two heated baffles are used in the configurations to analyze the effect of heat transfer in terms of streamlines, local Nusselt number, velocity and isotherms within the three configurations. The results show that the locations of the heated baffles along the horizontal walls enable to create simultaneously the isolated zone and the heated zone in the baffled vented cavity.

Keywords:
heated baffle vented cavity isolated zone passive cooling heat enhancement

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Figures

References:

[1]	Du S-Q, Bilgen E and Vasseur P 1998 Mixed convection heat transfer in open ended channels with protruding heaters. Heat Mass Transfer 34: 263-270.
[2]	How S-P and Hsu T-H 1998 Transient mixed convection in a partially divided enclosure. Computers Math.Applic. 36: 95-115.
[3]	Hsu T H and How S P 1999 Mixed convection in an enclosure with a heat-conducting body. Acta Mechanica1 33: 87-104.
[4]	El-din M M S 2002 Effect of viscous dissipation on fully developed laminar mixed convection in a vertical double-passage channel. Int. J. Thermal Sci. 41: 253-259.
[5]	Manca O, Nardini S, Khanafer K and Vafai K 2003 Effect of heated wall position on mixed convection in a channel with an open cavity. Numer. Heat Transfer A 43: 259-282.
[6]	Singh S. and Sharif M. A. R. 2003, Mixed convective cooling of a rectangular cavity with inlet and exit openings on differentially heated side walls. Numer. Heat Transfer A 44: 233-253.
[7]	Raji A, Hasnaoui M and Bahlaoui A 2008 Numerical study of natural convection dominated heat transfer in a ventilated cavity: Case of forced flow playing simultaneous assisting and opposing roles. Int. J. Heat Fluid Flow 29: 1174-1181.
[8]	Bahlaoui A, Raji A, Hasnaoui M, Naïmi M, Makayssi T and Lamsaadi M 2009 Mixed convection cooling combined with surface radiation in a partitioned rectangular cavity. Energy Conv. Management 50: 626-635.
[9]	Chang T-S and Shiau Y-H 2005 Flow pulsation and baffles effects on the opposing mixed convection in avertical channel. Inter. J. Heat Mass Transfer 48: 4190-4204.
[10]	Chung C K, Wu C-Y and Shih T R 2008 Effect of baffle height and Reynolds number on fluid mixing. Microsyst. Technol. 14: 1317-1323.
[11]	Radhakrishnan T V, Joseph G, Balaji C and Venkateshan S P 2009 Effect of baffle on convective heat transfer from a heat generating element in a ventilated cavity. Heat Mass Transfer 45: 1069-1082.
[12]	Asif M R, Hossain M S and Hossain K A 2011 Heat Transfer in a rectangular enclosure with baffles. ARPN J. Eng. Appl. Sci. 6: 29-41.
[13]	Sripattanapipat S and Promvonge P 2009 Numerical analysis of laminar heat transfer in a channel with diamond-shaped baffles. Int. Commun. Heat Mass Transfer 36: 32-38.
[14]	Sriromreun P, Thianpong C and Promvonge P 2012 Experimental and numerical study on heat transfer enhancement in a channel with Z-shaped baffles. Int. Commun. Heat Mass Transfer 39: 945-952.
[15]	Manca O, Nardini S and Vafai K 2008 Experimental investigation of opposing mixed convection in a channel with an open cavity below. Exper. Heat Transfer 21: 99-114.
[16]	Woods L.C. 1954. A note of numerical solution of fourth differential equations, Aero. Q. 5, 176-l 84.
[17]	Sumon SahaMd. Tofiqul Islam, Mohammad Ali, Md. Arif Hasan Mamun and M. Quamrul Islam, 2006.Effect of inlet and outlet locations on transverse mixed convection inside a vented enclosure.Journal of Mechanical Engineering, vol. ME36, Dec. 2006. PP 27- 37.