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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016007343
pages 95-108

ROLE OF THERMAL RADIATION IN BUOYANT CONVECTION OF INDUSTRIAL DUSTY AIR: A NUMERICAL INVESTIGATION

Sofen K. Jena
Department of Flows and Materials Simulation, Fraunhofer Institute for Industrial Mathematics (ITWM), Kaiserslautern, Germany, D-67663; Department of Mechanical Engineering, Jadavpur University, Kolkata, India-700032
Swarup Kumar Mahapatra
Indian Institute of Technology Bhubaneswar

ABSTRAKT

In the changing economic scenario, due to urbanization and industrialization, a number of pollutants are released into the atmosphere, which directly affects the human health, climate, environment, and ecological balances. The current study focuses on interaction of thermal radiation with natural convection of industrial dusty air. A numerical model has been proposed by incorporating a volume fraction of a suspended pollutant particle in dusty air, which is treated as a nanofluid. The current study puts emphasis on ultrafine carbon-black particle suspension of several nanometer range along with some pollutant gas mixture with atmospheric air. The numerical simulation of thermogravitational convection of dusty air is done with the Hide and Mason laboratory model for atmosphere. A species of dusty air is taken within a tilted cavity for a deep study of the transportation and heat transfer mechanism. The boundary of the enclosure taken as a physical model is a gray, diffuse emitter, and absorber of thermal radiation, and the enclosed dusty air is assumed to be isotropically scattering, emitting, and absorbing thermal radiation. The effect of participating media radiation has been investigated for various optical depths, scattering albedos, and Planck numbers. The Navier−Stokes equations, describing transportation of polluted air, are solved using a modified marker and cell method. A gradient-dependent consistent hybrid upwind scheme of second order is used for discretization of convective terms. A discrete ordinate method with S8 approximation is used to solve the radiative transport equation. A comprehensive study of controlling parameters that affect the flow and heat transfer characteristics has been made. The results are provided in graphical and tabular forms. Isotherms and flow lines are provided to delineate the flow behavior and heat transfer characteristics.


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