Numerical simulation of two-dimensional steady-state and transient forced convective boiling
The study of forced convective boiling has been based on experimental efforts in the past due to the complexity of the flows and lack of analytical tools. With the advancement of the computer hardware and numerical methods, the mathematical simulation of the two-phase flow and heat transfer including the forced convective boiling has become reality. The present mathematical method is based on the two-fluid non-equilibrium (TFNE) conservation equations. The forced convective boiling is subcooled boiling, saturated boiling and post-CHF (Critical Heat Flux) regions has been simulated. Physical models used in the auxiliary relations include the interfacial mass, momentum and heat exchange relations, distribution of wall heat flux to each phase, and liquid phase turbulence. A k-[epsilon] turbulence model is coupled with the TFNE equations and auxiliary relations to solve the flow parameters in subcooled and saturated regimes. These models are investigated for the various flow regimes encountered in the normal and transient operating conditions. The physical models are described in detail in this study and the applicable range of these models is also identified in this study. An algebraic turbulence model for vapor phase is used for the simulation of the post-CHF boiling. The auxiliary and interfacial relations for this boiling regime are also described. The TFNE conservation equations with auxiliary relations are solved numerically. The equations are written in finite difference form, and the Inter-Phase Slip Algorithm (IPSA) procedure is used to solve the finite difference equations. The model predicts the void fraction, velocity and temperature profiles in both the lateral and axial directions in heated pipe and channel geometries for the subcooled and saturated boiling conditions. The vapor temperatures and flow fields are predicted in the post-CHF region for a rod bundle geometry.
- Research Organization:
- Drexel Univ., Philadelphia, PA (United States)
- OSTI ID:
- 6878018
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FORCED CONVECTION
COMPUTERIZED SIMULATION
HEAT TRANSFER
FINITE DIFFERENCE METHOD
TWO-PHASE FLOW
BOILING
CALCULATION METHODS
CONVECTION
ENERGY TRANSFER
FLUID FLOW
ITERATIVE METHODS
MASS TRANSFER
NUMERICAL SOLUTION
PHASE TRANSFORMATIONS
SIMULATION
420400* - Engineering- Heat Transfer & Fluid Flow