Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"Drift-flux model"”.
-
Two-Phase Flow Dynamics by a Five-Equation Drift Flux Model
Made available in DSpace on 2017-07-06T18:49:00Z (GMT). No. of bitstreams: 3 Kim_Chulsoo_MS.pdf: 27877982 bytes, checksum: d3e665bc705fec3b391db5aa2f76cd57 (MD5) Kim_Chulsoo_MS_ABS.pdf: 402696 bytes, checksum: 4073dbfb74579e93909191cb257c0985 (MD5) license.txt: 4813 bytes, checksum: …
-
Linear and Nonlinear Stability Analyses of Density-Wave Oscillations in Heated Channels
… The two-phase flow is represented by the drift flux model. A constant characteristic velocity v$\sbsp{\rm o}{\*}$ is used to make the set of equations dimensionless to ensure the mutual independence of the dimensionless variables and parameters.
-
Uncertainty Quantification and Accuracy Improvement of the Double-Sensor Conductivity Probe for Two-Phase Flow Measurement
… are analyzed: that of measurands, of the model input parameters, and of the mathematical models. A Monte Carlo uncertainty evaluation framework closely simulating the actual measuring process is developed to link various uncertainty sources to the time-averaged two-phase flow quantities …
-
Modelling Transient Air-water Flows in Civil and Environmental Engineering
… First, I show that any mathematical model for free surface flows can be extended to pressurized flows. Second, the multiphase drift‐flux model is proven an adequate alternative to Navier‐ Stokes equations in civil and environmental engineering. These propositions underpin the …
-
Hydrodynamics and gas holdup in a cocurrent air-water-fiber bubble column
… bubble column are identified based on the drift-flux model. Three gas flow regimes (i.e., dispersed bubble, vortical-spiral, and turbulent flow) are identified. When fiber mass fraction is higher than a certain value (which is a function of fiber type), the dispersed bubble flow regime …
-
Two phase problems and two phase flow
… 1 of this thesis a two-dimensional mathematical model is used to investigate the circulation in a gas-bubble agitation system of a cylindrical vessel for the case of an orifice located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region …
-
Abordagem algébrico-diferencial na simulação unidimensional do escoamento bifásico em dutos
… to equally accurate two-phase flow mathematical models. A literature survey has shown that this problem has been currently addressed by means of one-dimensional simulations based predominantly on Two-Fluid and Drift-Flux Models, although simpler methods which employ the assumption of homogeneous …
-
A Calculation Model for Steam Property Variation Along Wellbore Trajectory in SAGD Process
… in horizontal wellbore by former technology. A model describe steam flow inside wellbore during conventional Steam Assisted Gravity Drainage stage (after the steam chamber has achieved full height and lateral growth becomes the dominant mechanism for recovery) was built and solved in this …
-
Integrated multiphase flow modeling in wellbore for downhole pressure predictions
… Thus, the common practice is to apply hydraulic models to predict P_wf given surface measurements. To do so, predicting the fluid flow behavior is vital. The prediction of such behavior is quite simple when dealing with single-phase fluid flow. Unfortunately, such is rarely the case in the …
-
The void fraction in headers of microchannel heat exchangers
… of void fraction in headers are challenging. A model that predicts the local void fraction between microchannel tube protrusions is also widely needed. Hence, it is essential to obtain the local void fraction in the zones between two microchannel tubes to have a better understanding of …
-
Sensitivity of the Two-Fluid Model to Constitutive Correlations for Large Diameter Pipes
… calculation. The three parameters evaluated were drift-flux, void fraction covariance, and interfacial area concentration. The change in drift-flux correlation was found to have a significant effect on the void fraction prediction. The two-group approach for calculating drift-flux was found to …
-
An Analysis of Multiple Particle Settling for LMR Backup Shutdown Systems
Made available in DSpace on 2017-07-06T18:42:32Z (GMT). No. of bitstreams: 3 Brock_Richard_W_MS.pdf: 40782738 bytes, checksum: 5617f77bae0a8346e76d9f4196e7d93a (MD5) Brock_Richard_W_MS_ABS.pdf: 541598 bytes, checksum: 34fc07d7a58af0c820f0039e08f41c54 (MD5) license.txt: 4813 bytes, checksum: …