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Summary
Summary
This book is intended to be an introduction to the theory of thermo-fluid dynamics of two-phase flow for graduate students, scientists and practicing engineers seriously involved in the subject. It can be used as a text book at the graduate level courses focused on the two-phase flow in Nuclear Engineering, Mechanical Engineering and Chemical Engineering, as well as a basic reference book for two-phase flow formulations for researchers and engineers involved in solving multiphase flow problems in various technological fields. The principles of single-phase flow fluid dynamics and heat transfer are relatively well understood, however two-phase flow thermo-fluid dynamics is an order of magnitude more complicated subject than that of the sing- phase flow due to the existence of moving and deformable interface and its interactions with the two phases. However, in view of the practical importance of two-phase flow in various modem engineering technologies related to nuclear energy, chemical engineering processes and advanced heat transfer systems, significant efforts have been made in recent years to develop accurate general two-phase formulations, mechanistic models for interfacial transfer and interfacial structures, and computational methods to solve these predictive models.
Table of Contents
Dedication | p. v |
Table of Contents | p. vii |
Preface | p. xiii |
Foreword | p. xv |
Acknowledgments | p. xvii |
Part I Fundamental of two-phase flow | |
1 Introduction | p. 1 |
1.1 Relevance of the problem | p. 1 |
1.2 Characteristic of multiphase flow | p. 3 |
1.3 Classification of two-phase flow | p. 5 |
1.4 Outline of the book | p. 10 |
2 Local Instant Formulation | p. 11 |
1.1 Single-phase flow conservation equations | p. 13 |
1.1.1 General balance equations | p. 13 |
1.1.2 Conservation equation | p. 15 |
1.1.3 Entropy inequality and principle of constitutive law | p. 18 |
1.1.4 Constitutive equations | p. 20 |
1.2 Interfacial balance and boundary conditions | p. 24 |
1.2.1 Interfacial balance (Jump condition) | p. 24 |
1.2.2 Boundary conditions at interface | p. 32 |
1.2.3 Simplified boundary condition | p. 38 |
1.2.4 External boundary condition and contact angle | p. 43 |
1.3 Application of local instant formulation to two-phase flow problems | p. 46 |
1.3.1 Drag force acting on a spherical particle in a very slow stream | p. 46 |
1.3.2 Kelvin-Helmholtz instability | p. 48 |
1.3.3 Rayleigh-Taylor instability | p. 52 |
Part II Two-phase field equations based on time average | |
3 Various Methods of Averaging | p. 55 |
1.1 Purpose of averaging | p. 55 |
1.2 Classification of averaging | p. 58 |
1.3 Various averaging in connection with two-phase flow analysis | p. 61 |
4 Basic Relations in Time Averaging | p. 67 |
1.1 Time domain and definition of functions | p. 68 |
1.2 Local time fraction - Local void fraction | p. 72 |
1.3 Time average and weighted mean values | p. 73 |
1.4 Time average of derivatives | p. 78 |
1.5 Concentrations and mixture properties | p. 82 |
1.6 Velocity field | p. 86 |
1.7 Fundamental identity | p. 89 |
5 Time Averaged Balance Equation | p. 93 |
1.1 General balance equation | p. 93 |
1.2 Two-fluid model field equations | p. 98 |
1.3 Diffusion (mixture) model field equations | p. 103 |
1.4 Singular case of [upsilon subscript ni]=0 (quasi-stationary interface) | p. 108 |
1.5 Macroscopic jump conditions | p. 110 |
1.6 Summary of macroscopic field equations and jump conditions | p. 113 |
1.7 Alternative form of turbulent heat flux | p. 114 |
6 Connection to Other Statistical Averages | p. 119 |
1.1 Eulerian statistical average (ensemble average) | p. 119 |
1.2 Boltzmann statistical average | p. 120 |
Part III Three-dimensional model based on time average | |
7 Kinematics of Averaged Fields | p. 129 |
1.1 Convective coordinates and convective derivatives | p. 129 |
1.2 Streamline | p. 132 |
1.3 Conservation of mass | p. 133 |
1.4 Dilatation | p. 140 |
8 Interfacial Transport | p. 143 |
1.1 Interfacial mass transfer | p. 143 |
1.2 Interfacial momentum transfer | p. 145 |
1.3 Interfacial energy trnasfer | p. 149 |
9 Two-fluid Model | p. 155 |
1.1 Two-fluid model field equations | p. 156 |
1.2 Two-fluid model constitutive laws | p. 169 |
1.2.1 Entropy inequality | p. 169 |
1.2.2 Equation of state | p. 172 |
1.2.3 Determinism | p. 177 |
1.2.4 Average molecular diffusion fluxes | p. 179 |
1.2.5 Turbulent fluxes | p. 181 |
1.2.6 Interfacial transfer constitutive laws | p. 186 |
1.3 Two-fluid model formulation | p. 198 |
1.4 Various special cases | p. 205 |
10 Interfacial Area Transport | p. 217 |
1.1 Three-dimensional interfacial area transport equation | p. 218 |
1.1.1 Number transport equation | p. 219 |
1.1.2 Volume transport equation | p. 220 |
1.1.3 Interfacial area transport equation | p. 222 |
1.2 One-group interfacial area transport equation | p. 227 |
1.3 Two-group interfacial area transport equation | p. 228 |
1.3.1 Two-group particle number transport equation | p. 229 |
1.3.2 Two-group void fraction transport equation | p. 230 |
1.3.3 Two-group interfacial area transport equation | p. 234 |
1.3.4 Constitutive relations | p. 240 |
11 Constitutive Modeling of Interfacial Area Transport | p. 243 |
1.1 Modified two-fluid model for the two-group interfacial area transport equation | p. 245 |
1.1.1 Conventional two-fluid model | p. 245 |
1.1.2 Two-group void fraction and interfacial area transport equations | p. 246 |
1.1.3 Modified two-fluid model | p. 248 |
1.1.4 Modeling of two gas velocity fields | p. 253 |
1.2 Modeling of source and sink terms in one-group interfacial area transport equation | p. 257 |
1.2.1 Source and sink terms modeled by Wu et al. (1998) | p. 259 |
1.2.2 Source and sink terms modeled by Hibiki and Ishii (2000a) | p. 267 |
1.2.3 Source and sink terms modeled by Hibiki et al. (2001b) | p. 275 |
1.3 Modeling of source and sink terms in two-group interfacial Area Transport Equation | p. 276 |
1.3.1 Source and sink terms modeled by Hibiki and Ishii (2000b) | p. 277 |
1.3.2 Source and sink terms modeled by Fu and Ishii (2002a) | p. 281 |
1.3.3 Source and sink terms modeled by Sun et al. (2004a) | p. 290 |
12 Hydrodynamic Constitutive Relations for Interfacial Transfer | p. 301 |
1.1 Transient forces in multiparticle system | p. 303 |
1.2 Drag force in multiparticle system | p. 308 |
1.2.1 Single-particle drag coefficient | p. 309 |
1.2.2 Drag coefficient for dispersed two-phase flow | p. 315 |
1.3 Other forces | p. 329 |
1.3.1 Lift Force | p. 331 |
1.3.2 Wall-lift (wall-lubrication) force | p. 335 |
1.3.3 Turbulent dispersion force | p. 336 |
1.4 Turbulence in multiparticle system | p. 336 |
13 Drift-flux Model | p. 345 |
1.1 Drift-flux model field equations | p. 346 |
1.2 Drift-flux (or mixture) model constitutive laws | p. 355 |
1.3 Drift-flux (or mixture) model formulation | p. 372 |
1.3.1 Drift-flux model | p. 372 |
1.3.2 Scaling parameters | p. 373 |
1.3.3 Homogeneous flow model | p. 376 |
1.3.4 Density propagation model | p. 378 |
Part IV One-dimensional model based on time average | |
14 One-dimensional Drift-flux Model | p. 381 |
1.1 Area average of three-dimensional drift-flux model | p. 382 |
1.2 One-dimensional drift velocity | p. 387 |
1.2.1 Dispersed two-phase flow | p. 387 |
1.2.2 Annular two-phase Flow | p. 398 |
1.2.3 Annular mist Flow | p. 403 |
1.3 Covariance of convective flux | p. 406 |
1.4 One-dimensional drift-flux correlations for various flow conditions | p. 411 |
1.4.1 Constitutive equations for upward bubbly flow | p. 412 |
1.4.2 Constitutive equations for upward adiabatic annulus and internally heated annulus | p. 412 |
1.4.3 Constitutive equations for downward two-phase flow | p. 413 |
1.4.4 Constitutive equations for bubbling or boiling pool systems | p. 413 |
1.4.5 Constitutive equations for large diameter pipe systems | p. 414 |
1.4.6 Constitutive equations at reduced gravity conditions | p. 415 |
15 One-dimensional Two-fluid Model | p. 419 |
1.1 Area average of three-dimensional two-fluid model | p. 420 |
1.2 Special consideration for one-dimensional constitutive relations | p. 423 |
1.2.1 Covariance effect in field equations | p. 423 |
1.2.2 Effect of phase distribution on constitutive relations | p. 426 |
1.2.3 Interfacial shear term | p. 428 |
References | p. 431 |
Nomenclature | p. 441 |
Index | p. 457 |