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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 47, 2020 Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2020029647
pages 229-245

NUMERICAL INVESTIGATION OF EFFECT OF DENSITY AND ASPECT RATIO ON BUOYANT OSCILLATORY EXCHANGE FLOW THROUGH CIRCULAR OPENING IN HORIZONTAL PARTITION USING SALT WATER ANALOGY

Bhuvaneshwar Gera
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
M. Alam
Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
R.K. Singh
DAE Raja Ramanna Fellow, Bhabha Atomic Research Centre, Trombay, Mumbai, India

Краткое описание

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.

Ключевые слова: salt water, horizontal partition, CFD, oscillation, opening

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