Research Article Open Access

Effect of Size of Heated Obstruction within Room on Three Dimensional Air Flow Characteristics

Abduljabbar Muttair Ahmed1, Mukhtar Ahmad2 and Abdur Rahim2
  • 1 , Afganistan
  • 2 ,
American Journal of Engineering and Applied Sciences
Volume 3 No. 2, 2010, 372-379

DOI: https://doi.org/10.3844/ajeassp.2010.372.379

Submitted On: 13 January 2010 Published On: 30 June 2010

How to Cite: Ahmed, A. M., Ahmad, M. & Rahim, A. (2010). Effect of Size of Heated Obstruction within Room on Three Dimensional Air Flow Characteristics. American Journal of Engineering and Applied Sciences, 3(2), 372-379. https://doi.org/10.3844/ajeassp.2010.372.379

Abstract

Problem statement: This study reported a numerical investigation of three-dimensional turbulent buoyant recirculating flow within a room with heated obstruction. Approach: The study involved the solution of partial differential equations for the conservation of mass, momentum, energy, concentration, turbulent energy and its dissipation rate. These equations were solved together with algebraic expressions for the turbulent viscosity and the heat diffusivity, using k-ε turbulence model. Results: The present study demonstrated the flow behavior, thermal distribution and CO2 concentration inside the room in the presence of heat flux obstruction with respect to three sizes of obstruction. Conclusion: The energy usage coefficient (efficiency of ventilation) increases with decrease in size of obstruction. Concentration of CO2 is very often used as an indicator for the control of air flow rate to the building. For the largest size of obstruction, the concentration of CO2 is maximum above the obstruction and reduces with the reduction in the size of the obstruction.

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Keywords

  • Concentration of CO2
  • efficiency of ventilation (Thermal)
  • velocity distribution
  • temperature contour
  • Computational Fluid Dynamics (CFD)