Double-diffusive natural convection in trapezoidal enclosures

This paper presents some results of numerical and experimental study of turbulent double-diffusive natural convection of a mixture of two gases in a trapezoidal enclosure with imposed unstable thermal stratification. The geometry and boundary conditions are selected to mimic an idealised situation i...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1998-07, Vol.41 (13), p.1885-1898
Main Authors: Van Der Eyden, J.T., Van Der Meer, Th.H., Hanjalić, K., Biezen, E., Bruining, J.
Format: Article
Language:English
Subjects:
Boundary conditions
Buoyancy
Coal gasification
Computational geometry
Convection and heat transfer
Diffusion in solids
Enclosures
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Mathematical models
Physics
Thermal stratification
Turbulent flows, convection, and heat transfer
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Summary:This paper presents some results of numerical and experimental study of turbulent double-diffusive natural convection of a mixture of two gases in a trapezoidal enclosure with imposed unstable thermal stratification. The geometry and boundary conditions are selected to mimic an idealised situation in underground coal gasification. In the computations turbulent fluxes of momentum, heat and mass were modelled by standard and low- Re-number (Launder-Sharma) κ-ε eddy diffusivity models with inclusion of thermal and mass buoyancy. The computed mean velocity, temperature and concentration, show satisfactory agreement with measurements, indicating that despite some deficiencies, the numerical model can reproduce most of the essential features of the process.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(97)00353-0