Research Papers

Experimental Analysis of Natural Convection and Flow Visualization in an Asymmetrically Heated Open Vertical Channel

[+] Author and Article Information
Yassine Cherif

Laboratory of Civil Engineering and Geo-Environment (LGCgE),
University of Artois,
F-62400 Béthune, France
e-mail: yassine.cherif@univ-artois.fr

Emilio Sassine

Faculty of Sciences,
Laboratory of Applied Physics (LPA),
Lebanese University, Fanar Campus,
Beirut, Lebanon
e-mail: emilio.sassine@ul.edu.lb

Laurent Zalewski

Laboratory of Civil Engineering and Geo-Environment (LGCgE),
University of Artois,
F-62400 Béthune, France
e-mail: laurent.zalewski@univ-artois.fr

Kaies Souidi

Département Chimie, CS20819,
Université d’Artois, IUT Béthune,
62408 Béthune, France
e-mail: kaies.souidi@gmail.com

Stephane Lassue

Laboratory of Civil Engineering and Geo-Environment (LGCgE),
University of Artois,
F-62400 Béthune, France
e-mail: stephane.lassue@univ-artois.fr

1Corresponding authors.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received October 29, 2018; final manuscript received March 29, 2019; published online July 18, 2019. Assoc. Editor: Sandip Mazumder.

J. Thermal Sci. Eng. Appl 11(5), 051020 (Jul 18, 2019) (9 pages) Paper No: TSEA-18-1549; doi: 10.1115/1.4043533 History: Received October 29, 2018; Accepted March 29, 2019

An experimental device was designed to perform the thermal and dynamic study of natural convection airflow in an open vertical channel. The two side walls of the vertical channel are made of Plexiglas allowing the visualization of the flow via the particle image velocimetry (PIV) method. For the two other vertical walls, one is heated at a constant temperature, and the other is insulated with a 9-cm thick polystyrene insulation. The dynamic characterization of convection is carried out by nonintrusive measurements (PIV), and thermal phenomena are analyzed using nonintrusive heat flux instrumentation (simultaneous temperature and velocity measurements have been carried out across the channel at different elevations). Moreover, this study deals with the influence of the Rayleigh number on the measured vertical velocity profiles as well as the thermal flux densities recorded along the heated wall. To do this, different values of the modified Rayleigh numbers were considered in the interval with the channel aspect ratio of A = 5 and A = 12.5. The obtained Nusselt number values have been compared successfully with those of the literature. The impacts of the Rayleigh number and the aspect ratio on the velocity profiles and the convective and radiative heat transfer have been examined.

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Fig. 1

Experimental configuration

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Fig. 2

Experimental apparatus: (a) vertical channel, (b) isothermal heat plate, and (c) heat flux sensor

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Fig. 3

Schematic drawing of the used heat flux sensors: (a) heat flux sensor's sketch and (b) calibration apparatus

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Fig. 4

Calibration of fluxmeters with tangential gradient

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Fig. 5

Schematic approximation of the local velocity of particles by the PIV method

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Fig. 6

Schematic experimental setup in the PIV method: (a) flow visualization of the flow structure in steady-state, (b) edge view, and (c) top view

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Fig. 7

Experimental measurements of the mean Nusselt number as a function of various modified Rayleigh numbers Ram with comparison to the literature

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Fig. 8

The experimental total heat flux densities ϕT (convection + radiation) along the heated wall with various modified Rayleigh numbers Ram: (a) aspect ratio A = 12.5 and (b) aspect ratio A = 5

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Fig. 9

The experimental radiative part of heat flux radiative densities ϕR along the heated wall with various modified Rayleigh numbers Ram: (a) aspect ratio A = 12.5 and (b) aspect ratio A = 5

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Fig. 10

Flow visualization by PIV technique at (a) 0 ≤ Y* ≤ 0.25, (b) 0.25 ≤ Y* ≤ 0.75, and (c) 0.75 ≤ Y* ≤ 1.00 for Ram = 2.27 × 103 and A = 12.5 (d = 4 cm) and at (d) 0 ≤ Y* ≤ 0.25, (e) 0.25 ≤ Y* ≤ 0.75, and (f) 0.75 ≤ Y* ≤ 1.00 for Ram = 3.26 × 105 and A = 5 (d = 10 cm)

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Fig. 11

Velocity profile: (a) Ram = 2.27 × 103 and A = 12.5 (d = 4 cm), (b) Ram = 2.04 × 104 and A = 12.5 (d = 4 cm), (c) Ram = 3.26 × 105 and A = 5 (d = 10 cm), and (d) Ram = 8.22 × 105 and A = 5 (d = 10 cm)



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