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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017016747
pages 1651-1668

NUMERICAL OPTIMIZATION OF DOUBLE-DIFFUSIVE MIXED CONVECTION IN A RECTANGULAR ENCLOSURE WITH A REACTANT FLUID

Guillermo E. Ovando-Chacon
Depto. Metal-Mecánica y Mecatrónica, Tecnologico Nacional de Mexico, Instituto Tecnológico de Veracruz, Calzada Miguel Ángel de Quevedo 2779, Veracruz, Ver 91860, México
S. L. Ovando-Chacon
Depto. Química y Bioquímica, Tecnologico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, Carretera Panamericana Km. 1080, Tuxtla Gutiérrez, Chis 29000, México
Juan C. Prince-Avelino
Depto. Metal-Mecánica y Mecatrónica, Tecnologico Nacional de Mexico, Instituto Tecnológico de Veracruz, Calzada Miguel Ángel de Quevedo 2779, Veracruz, Ver 91860, México
A. Rodriguez-Leon
Depto. Metal-Mecánica y Mecatrónica, Tecnologico Nacional de Mexico, Instituto Tecnológico de Veracruz, Calzada Miguel Ángel de Quevedo 2779, Veracruz, Ver 91860, México
C. Garcia-Arellano
Instituto de Agroingenieria, Campus Loma Bonita, Universidad del Papaloapan, Av. Ferrocarril s/n Cd. Universitaria, Loma Bonita, Oax 68400, México

ABSTRAKT

In the present paper, we systematically study the effects of the heater length (Wp), as well as of the Richardson (Ri), Lewis (Le), and Reynolds (Re) numbers on the irreversibility production of double-diffusive mixed convection in an open enclosure with a reactant fluid. The fluid with temperature-dependent viscosity and thermal conductivity enters and leaves the enclosure through the inlet and outlet located at the left and right, respectively. Moreover, a heat source located at the bottom wall transfers energy to the fluid, and thermochemical conversion takes place inside the enclosure. At the inlet the fluid is considered to have a high concentration, while a low concentration is imposed over the heater. The studied cases cover Ri = 0.75–5, Le = 0.1–5, Wp = 0.2–0.4, and Re = 100–1000. The results include the temperature and concentration contours, average concentration profiles, average Nusselt number, global total entropy generation, and the average Bejan number. Simulations indicate that the thermochemical conversion is practically independent of the length of the heater, and its highest value or lowest concentration of the flow occurs at Le = 5, Ri = 1.25, and Re = 100. Furthermore, the entropy production is minimized at Wp = 0.3, Re = 100, Ri = 0.75, and Le = 2.5. Therefore, the optimal condition of the thermochemical conversion device is attained at Le = 2.5, Wp = 0.3, Re = 100, and 0.75 ≤ Ri ≤ 1.25.


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