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The aim of present work is investigation focused on experimental verification of forces acting on bubble flowing along the wall and subsequent implementation of the findings into the model of void fraction distribution, developed earlier by one of the co-authors [6]. In experimental investigations the bubble is represented by a solid sphere suspended on a thin string. Authors are convinced that the presented model of a bubble motion captures at least a qualitative behaviour of a bubble in the bubbly flow and will compliment the transverse force balance acting on the bubble. Such transverse balance of forces forms one of equations involved in the model of void fraction developed by Mikielewicz [6]. Presented results of experimental research show periodic character of sphere movement (simplified bubble model) along the wall of vertical channel, which is in line with findings of the experiments preformed on bubbles in vicinity of wall. Sphere trajectory visibly changes, which are caused by non-uniform velocity distribution of fluid around the sphere related to non-uniform pressure field around it, giving in such a way rise to the repelling force. The wall force was introduced to the model of void fraction distribution and improved results were obtained.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
95--116
Opis fizyczny
Wz., wykr., rys.,Bibliogr. 26 poz.,
Twórcy
autor
autor
- Technical Uuniversity of Gdańsk, Faculty of Mechanical Engineering, 80-952 Gdańsk, Narutowicza 11/12
Bibliografia
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- [2] LANCE M, LOPEZ DE BERTODANO M.: Phase Distribution Phenomena, in: Multiphase Science and Technology, ed. Hewitt et al,, Begell House inc., New York, Vol. 8, 1994, 69-123.
- [3] LAHEY R.T. JR, DREW R.T.: The analysis of two-phase flow and heat transfer using a multidimensional, four field, two-fluid model, Nuclear Engineering and Design, 204, 2001, 29-44.
- [4] MORAGA F.J., BONETTO F.J., LAHEY R.T.: Lateral forces on spheres in turbulent uniform shear flow, Int. J. Multiphase Flow, 25, 1999, 1321-1372.
- [5] KREPPER E., EGOROV Y.: CFD-modelling of subcooled boiling and application to simulate a hot channel of a fuel assembly, 13th Int. Conf. on Nuclear Engineering, Beijing, China, May 16-20 2005.
- [6] MIKIELEWICZ D.: Hydrodynamic and heat transfer in bubbly flow in the turbulent boundary layer, Int. J. Heat and Mass Transfer, 46 (2003), 207-220.
- [7] MIKIELEWICZ D.: Universal velocity profile in bubbly flow in the turbulent boundary layer, Arch. of Thermodynamics, Vol. 21, No. 3-4, 2000, 117-132.
- [8] MIKIELEWICZ D.: Modelling of heat transfer in bubbly flow in the turbulent boundary layer, Arch. of Thermodynamics, Vol. 22, No. 1-2, 33-49, 2001.
- [9] DUINEVELD P.C.: Bouncing and coalescence of two bubbles in water, PhD thesis, University of Twente, 1994.
- [10] BULTHUIS H.F.: Dynamics of bubbly flows, PhD thesis, University of Twente, 1997.
- [11] DE VRIES A. W.G.: Path and wake of a rising bubble, PhD thesis, University of Twente, 2001.
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- [15] WANG SK, LEE SJ, JONES OC JR, LAHEY RT JR: Three-dimensional turbulence structure and phase distribution measurements in bubbly two-phase flows, Int. J. Multiphase Flow, 13, 1987, 327-343.
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- [18] MOURSALI E., MARIÉ JL AND BATAILLE J .: An upward turbulent bubbly boundary layer along a vertical flat plate, Int. J. Multiphase Flow, Vol. 21, No. 1, 1995, 107-117.
- [19] MARIÉ J.L., MOURSALI E., TRAN-TONG S.; Similarity law and turbulence intensity profiles in a bubble layer at low void fractions, Int. J. Multiphase Flow, 23(1997), 227-247.
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- [21] ŽUN I.: The transverse migration of bubbles influenced by walls in vertical bubbly flow, Int. J. Multiphase Flow, Vol. 6, 1980, 583-588.
- [22] TOMIYAMA A., KATAOKA I., ŽUN I. AND SAKAGUCHI T.: Drag coefficients of single bubbles under normal and micro gravity conditions, JSME Int. J., Ser. B, 41, 2, 1998.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-1546-5980