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International Journal of Fluid Mechanics Research
NUMERICAL INVESTIGATION OF EFFECT OF DENSITY AND ASPECT RATIO ON BUOYANT OSCILLATORY EXCHANGE FLOW THROUGH CIRCULAR OPENING IN HORIZONTAL PARTITION USING SALT WATER ANALOGY
Homi Bhabha National Institute, Mumbai/Bhabha Atomic Research Centre, Trombay, Mumbai, India
Arun Kumar Nayak
Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, Maharashtra, India; Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai-400085, India
Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
DAE Raja Ramanna Fellow, Bhabha Atomic Research Centre, Trombay, Mumbai, India
An interesting transport phenomenon is observed through openings between two compartments separated by a thin,
vented, horizontal partition. A heavier fluid placed on the top of a lighter fluid and separated by a horizontal vent
constitutes a gravitationally unstable system and produces a flow that is unstable with irregular oscillatory behavior.
Computational fluid dynamics (CFD) simulations have been performed to simulate such type of flow across a circular
opening in a horizontal partition using salt water and fresh water as working fluids. The effect of density ratio and
opening aspect ratio on the oscillation frequency and flow coefficient through the opening has been investigated. An
in-house finite volume method (FVM) based CFD code was developed to solve unsteady, axisymmetric Navier-Stokes
equations along with realizable k-ε turbulence model and species transport for salt mass fraction. Higher order convection scheme was used to capture the oscillations correctly. A parametric study was performed with 4 density differences and 5 opening aspect ratios. It was observed that density difference has little influence on flow coefficient and significant influence on pulsation frequency, but aspect ratio has a strong influence on both the flow coefficient, as well as
the pulsation frequency. A correlation was developed to predict the frequency of oscillation for a given value of density
ratio and opening aspect ratio within a reasonable accuracy.
Blomqvist, C. and Sandberg, M., A Note on Air Movements through Horizontal Openings in Buildings, Natural Ventilation, University of Gavle, Centre for Building Environment, 2000.
Brown, W.G., Natural Convection through Rectangular Openings in Partitions-2 Horizontal Openings, Int. J. Heat Mass Transf., vol. 5, pp. 869-881, 1962.
Chow, W.K. and Gao, Y., Oscillating Behaviour of Fire-Induced Air Flow through a Ceiling Vent, Appl. Therm. Eng., vol. 29, pp. 3289-3298, 2009.
Conover, T.A., Kumar, R., and Kapat, J.S., Buoyant Pulsating Exchange Flow through a Vent, J. Heat Transf., vol. 117, pp. 641-648, 1995.
Cooper, L.Y., Calculating Combined Buoyancy and Pressure Driven Flow through a Shallow, Horizontal, Circular Vent, Fire Saf. J., vol. 27, pp. 23-35, 1996.
Epstein, M., Buoyancy Driven Exchange Flow through Small Opening in Horizontal Partitions, J. Heat Transf., vol. 110, pp.885-893, 1988.
Epstein, M. and Kenton, M.A., Combined Natural Convection and Forced Flow through Small Opening in Horizontal Partitions, with Special References to Flow in Multi Compartment Enclosures, J. Heat Transf., vol. 111, pp. 980-987, 1989.
Fleischmann, C.M., Pagni, P.J., and Williamson, R.B., Salt Water Modelling of Fire Compartment Gravity Currents, in Fire Safety Science-Proceedings of the Fourth International Symposium, Ottawa, Canada, International Association for Fire Safety Science, Gaithersburg, MD, pp. 253-264, 1994.
Gera, B., Investigation of Bi-Directional Flow through Large Opening, M. Tech., Indian Institute of Technology, Delhi, New Delhi, 2005.
Gera, B., Sharma, P.K., Singh, R.K., and Vaze, K.K., Numerical Simulation of Buoyant Pulsating Exchange Flow through Circular Opening in Horizontal Partition, CFD Lett., vol. 4, pp. 20-32, 2012.
Harrison, R.P. and Spall, R.E., The Effect of Partition Thickness on Buoyant Exchange Flow through a Horizontal Opening, Numer. Heat Transf. Part A, vol. 44, pp. 451-462, 2003.
Hayase, T., Humphrey, J.A.C., and Grief, R.A., Consistently Formulated QUICK Scheme for Fast and Stable Convergence Using Finite Volume Iterative Calculation Procedures, J. Comp. Phys., vol. 98, pp. 108-118, 1992.
Jaluria, Y., Lee, S.H.K., Mercier, G.P., and Tan, Q., Transport Processes across a Horizontal Vent due to Density and Pressure Differences, Exp. Therm. Fluid Sci., vol. 16, pp. 260-273, 1998.
Kerrison, L., Galea, E.R., and Patel M.K., A Two-Dimensional Numerical Investigation of the Oscillatory Flow Behaviour in Rectangular Fire Compartments with a Single Horizontal Ceiling Vent, Fire Saf. J., vol. 30, pp. 357-382, 1998.
Li, Z., Heiselberg, P., and Nielsen, P.V., Characteristics of Buoyancy Driven Single-Sided Natural Ventilation through Horizontal Openings, Proc. of Built Environment and Public Health, Shantou, China, 2004.
McBryde, J.D., Experimental and Numerical Modelling of Gravity Currents Preceding Backdrafts, M.E., University of Canterbury, Christchurch, New Zealand, 2008.
Markatos, N.C., Malin, M.R., and Cox, G., Mathematical Modelling of Buoyancy-Induced Smoke Flow in Enclosures, Int. J. Heat Mass Transf., vol. 25, pp. 63-75, 1982.
Mishra, A.A., Hasan, N., Sanghi, S., and Kumar, R., Two-Dimensional Buoyancy Driven Thermal Mixing in a Horizontally Partitioned Adiabatic Enclosure, Phys. Fluids, vol. 20, p. 063601, 2008.
Patankar, S.V., Numerical Heat Transfer and Fluid Flow, Washington DC: Hemisphere Pub. Co., 1980.
Siang, C.C., Characterizing Smoke Dispersion along Beamed Ceilings Using Saltwater Modeling, MS, University of Maryland, College Park, MD, 2010.
Singhal, M. and Kumar, R., Unsteady Buoyant Exchange Flow through a Horizontal Partition, J. Heat Transf., vol. 117, pp. 515-520, 1995.
Sleiti, A.K., Effect of Vent Aspect Ratio on Unsteady Laminar Buoyant Flow through Rectangular Vents in Large Enclosures, Int. J. Heat Mass Transf., vol. 51, pp. 4850-4861, 2008.
Spall, R.E. and Anderson, E.A., A Numerical Study of Buoyant, Pulsating Exchange Flows through a Vent in a Thin Horizontal Partition, Numer. Heat Transf. Part A, vol. 36, pp. 263-272, 1999.
Tan, Q. and Jaluria, Y., Mass Flow through a Horizontal Vent in an Enclosure due to Pressure and Density Differences, Int. J. Heat Mass Transf., vol. 44, pp. 1543-1553, 2001.
Viollet, P.L., The Modelling of Turbulent Recirculating Flows for the Purpose of Reactor Thermal-Hydraulic Analysis, Nucl. Eng. Des., vol. 99, pp. 365-377, 1987.
Weng, W.G., Fan, W.C., Qin, J., and Yang, L.Z., Study on Salt Water Modelling of Gravity Currents Prior to Backdrafts Using Flow Visualization and Digital Particle Image Velocimetry, Exp. Fluids, vol. 33, pp. 398-404, 2002.
Yakhot, V., Orszag, S.A., Thangam, S., Gatski, T.B., and Speziale, C.G., Development of Turbulence Models for Shear Flows by a Double Expansion Technique, Phys. Fluids A, vol. 4, pp. 1510-1520, 1992.
Yao, X. and Marshall, A.W., Quantitative Salt-Water Modelling of Fire-Induced Flow, Fire Saf. J., vol. 41, pp. 497-508, 2006.
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