Numerical Study of the Double Diffusion Natural Convection inside a Closed Cavity with Heat and Pollutant Sources Placed near the Bottom Wall

Juan Serrano-Arellano, Juan M. Belman-Flores, Jesús Xamán, Karla M. Aguilar-Castro and Edgar V. Macías-Melo
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Juan Serrano-Arellano: Instituto Tecnológico Superior de Huichapan, ITESHU-TecNM, Huichapan, Hidalgo 42411, Mexico
Juan M. Belman-Flores: Engineering Division, Campus Irapuato-Salamanca, University of Guanajuato, Salamanca 36885, Mexico
Jesús Xamán: Centro Nacional de Investigación y Desarrollo Tecnológico, CENIDET-TecNM, Cuernavaca 62490, Mexico
Karla M. Aguilar-Castro: División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco, Cunduacán 86690, Mexico
Edgar V. Macías-Melo: División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco, Cunduacán 86690, Mexico

Energies, 2020, vol. 13, issue 12, 1-17

Abstract: A study was conducted on the double diffusion by natural convection because of the effects of heat and pollutant sources placed at one third of the closed cavity’s height. The heat and pollution sources were analyzed separately and simultaneously. The study was considered for the Rayleigh number interval 10 4 ≤ R a ≤ 10 10 . Three case studies were analyzed: (1) differentially heated closed cavity with only heat sources; (2) differentially heated closed cavity with only pollutant sources; and (3) differentially heated closed cavity with heat and pollutant sources. The governing equations of the system were solved through the finite volume technique. The turbulence solution was done with the k-ε model. The dominant influence of the buoyancy forces was found due to the pollutant diffusion on the flow pattern, and an internal temperature increase was observed with the simple diffusion. The most critical case was obtained through the double diffusive convection with an average temperature value of 32.57 °C. Finally, the Nusselt number increased as the Rayleigh number increased; however, the Sherwood number either increased or decreased when the Rayleigh number increased. The highest mean concentration recorded was 2808 ppm; this was found with the value R a = 10 6 .

Keywords: numerical simulation; heat and mass transfer; point sources; turbulent flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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