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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.
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