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LATTICE BOLTZMANN METHOD (LBM) FOR THERMAL MULTIPHASE FLUID DYNAMICS

Chang, Qingming
http://rave.ohiolink.edu/etdc/view?acc_num=case1133469811

Abstract Details

2006, Doctor of Philosophy, Case Western Reserve University, Mechanical Engineering.
A multiphase lattice Boltzmann method (MLBM) based on the HSD model has been adapted for the solution of multiphase fluid dynamics problem. The interactions between particles are expressed through a mean-field approximation and exclusion-volume effect. The behavior of interface is obtained as part of the solution of the lattice Boltzmann equations. No a priori assumptions and artificial treatment are made regarding the shape and dynamic roles of the interface. Interfacial tension dynamics is validated through a series of test running of three-dimensional wave dispersion. The MLBM is also extended to thermal multiphase LBM (TMLBM) which includes the effects of interfacial tension and its dependence on temperature by a hybrid scheme. The key point for this scheme is combining a micro-scale description of the flow with a macroscopic energy transport equation. Applying the TMLBM, a systematic investigation of fluid dynamics in a two-layer immiscible fluid system is undertaken starting with Rayleigh-Benard convection. A parametric study of the effects of thermally induced density change, buoyancy, surface tension variation with temperature on interface dynamics, flow regimes and heat transfer is presented. Further investigation of TMLBM is applied to a two-layer immiscible fluid system with density inversion in which density inverse assumption holds for the lower layer fluid. The evaluation of the effects of density distribution parameter, Rayleigh number, size aspect ratio and Marangoni number on convection flow and heat transfer is presented. Interaction between gravity-induced and vibration-induced thermal convection in a two-layer fluid system has also be studied by TMLBM. The vibrations considered correspond to sinusoidal translations of a rigid cavity at a fixed frequency and is parallel to temperature gradient. The ability of applied vibration to enhance the flow, heat transfer and interface distortion is investigated. Comparisons of two-phase fluid system with single-phase fluid system are discussed. Finally, a nearest-neighbor molecular interaction force is introduced into LB equation to model the adhesive forces between the fluid and solid surface. The behavior of a micron-scale fluid droplet on a heterogeneous surface is investigated. The dependence of spreading/breakup behavior of a hemispherical droplet on the structure and wettability of the surface and gravity is investigated.
J. Iwan D. Alexander (Advisor)
204 p.
Lattice Boltzmann Method; Multiphase fluid dynamics; Droplet Spreading dynamics; Two-phase Rayleigh-Benard Convection; Thermovibrational Convection; Micro-scale Fluidics

Recommended Citations

Citations

  • Chang, Q. (2006). LATTICE BOLTZMANN METHOD (LBM) FOR THERMAL MULTIPHASE FLUID DYNAMICS [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1133469811

    APA Style (7th edition)

  • Chang, Qingming. LATTICE BOLTZMANN METHOD (LBM) FOR THERMAL MULTIPHASE FLUID DYNAMICS. 2006. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1133469811.

    MLA Style (8th edition)

  • Chang, Qingming. "LATTICE BOLTZMANN METHOD (LBM) FOR THERMAL MULTIPHASE FLUID DYNAMICS." Doctoral dissertation, Case Western Reserve University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1133469811

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.