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Showing 1 to 20 of 42 for “"buoyancy forces"”.
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The Effect of Buoyancy Forces on The Melting and Freezing Process
Made available in DSpace on 2014-12-08T23:18:16Z (GMT). No. of bitstreams: 1 6607715.pdf: 6805913 bytes, checksum: 3070593242f43738866b38c727dd3c71 (MD5) Previous issue date: 1966
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Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180° Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts with Rotation - Effect of Coriolis and Centrifugal Buoyancy Forces
… anisotropic, and the presence of rotational body forces further complicates the flow. Large Eddy Simulations are used to study these flows because of their ability to predict the unsteady flow effects and anisotropic turbulence more reliably than traditional RANS closure models. Calculations in a …
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Size based separation of submicron nonmagnetic particles through magnetophoresis in structured obstacle arrays
… submicron size range utilizing magnetophoretic forces. When a nonmagnetic particle is immersed in a magnetic fluid and subjected to magnetic field gradients, it behaves like a magnetic hole and experiences magnetic buoyancy forces proportional to its volume. This size dependence of magnetic …
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Modeling and characterizing bi-directional airflow in natural ventilation
… and analyzed: 1. Two-zone model with pure buoyancy forces, 2. Multi-zone model with combined wind and buoyancy forces. In the 1st model, a new concept of "local discharge coefficient" is proposed for its consistency under different boundary conditions. The influence of radiative heat …
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The Effects Of Diffusion, Capillary Heterogeneity, And Porous Media Morphology On CO2 Migration In Porous Media
… of capillary heterogeneity in combination with buoyancy and viscous forces were varied to yield 105 different simulation scenarios. Thereafter, the invasion of the CO2 gas is simulated using a finite difference model and the effective mass transfer coefficient is determined and linked to various …
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Velocity, temperature and turbulence measurements in air under combined free and forced convection conditions
… an experimental investigation of the effect of buoyancy forces on turbulent upflow of air in a vertical pipe under condit.io:1s of constant wall heat flux at Reynolds numbers of 5000 to 14000. Preliminary velocity and axial turbulence intensity measurements in isothermal flows for Reynolds …
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A Finite Element Framework for the Thermal Analysis of Solids and Fluids
… are accounted for in case of fluids using buoyancy forces. Developing a unified thermal-displacement approach for both solids and fluids can be challenging in the presence of motion and boundary kinematic constraints; some of which must be formulated using nonlinear algebraic equations and …
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Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts
… of DES in capturing the effects of Coriolis forces, which are induced by rotation, and centrifugal buoyancy forces, which are induced by thermal gradients, are also authenticated. The accurate prediction of turbulent flows is sensitive to the level of turbulence predicted by the turbulence …
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Unsteady hydromagnetic chemically reacting mixed convection MHD flow over a permeable stretching sheet embedded in a porous medium with thermal radiation and heat source/sink
… the Schmidt number (Sc), Unsteady parameter (A), buoyancy forces ratio parameter (N), Chemical reaction (K), Radiation parameter (Nr), Eckert number (Ec), local heat source/sink parameter (Q) and buoyancy parameter due to temperature ( ). The coe cient of Skin friction and Heat transfer are …
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Regional-Scale Impacts of Fluid Composition and Geologic Structure for Injection-Induced Seismicity in the Southern U.S. Midcontinent
… as injection data from 2006-2018. Results show buoyancy forces interacting with regional stratigraphic dip to force density-driven pressure transients into the deep Anadarko Basin, aligning with previously unexplained earthquakes in that region.
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The Mechanics of Active Faulting and Mountain Building
… distribution and slip vectors to infer that buoyancy forces are important in controlling the pattern of deformation. Calculations of the buoyancy forces indicate that faults cutting through the foreland support forces ~4-8 TN/m and have effective coefficients of static friction <0.2. Finally, …
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A numerical framework for the direct simulation of solid-fluid systems
… the first order include dynamic fluid-induced forces, buoyancy forces, and intergranular forces from particle collisions, static formation stresses, and intergranular bonding. Coupling is realized with an immersed moving boundary scheme that has been thoroughly validated.
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CFD determination of fluid and geometry related localized heat transfer phenomena for supercritical water flow
… the turbulence production in the fluid due to buoyancy forces. Buoyancy forces were also studied in downward flow under the same conditions and were shown to reduce the deterioration in heat transfer observed in upward flow. The second part involved an investigation of fluid property effects in …
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Analysis of buoyancy driven airflow patterns in a model of a naturally ventilated building
… buildings use temperature gradients to create buoyancy forces in the space and drive the airflow pathways in the space. One architectural design feature that facilitates natural ventilation is the presence of stack ventilation in the roof of the building, which facilitates the expulsion of …
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A Geodynamic Investigation of Continental Rifting and Mantle Rheology: Madagascar and East African Rift case studies
… Madagascar, 2) to elucidate the main driving forces of observedpresent-day∼E-W opening in the EAR, and 3) to investigate the role of multiple plumesor a superplume in driving surface deformation in the EAR. In chapter 1, we simulate EdgeDriven convection (EDC), constrained by a lithospheric …
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The Influence of Layering and Time-Dependent Injection Rates on Gravity-Driven Flows in Porous Media
… carbon and hydrogen storage in the limit where buoyancy forces dominate. In particular, we explore the influence that both layering of the rock formation, as well as time-dependent injection rates, have on the evolution of the flows. We give a brief introduction to carbon and hydrogen storage, …
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A Study of Centrifugal Buoyancy and Particulate Deposition in a Two Pass Ribbed Duct for the Internal Cooling Passages of a Turbine Blade
… augmentation due to Coriolis and centrifugal buoyancy forces that arises from density stratification in the domain. Gas turbine engines operate in particle laden environments (sand, volcanic ash), and particulate matter ingested by the engine can make their way into the blade internal cooling …
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An investigation into turbine ventilators as a potential environmental control measure to minimise the risk of transmission of tuberculosis - a laboratory and field study
… tested in a laboratory environment under wind, buoyancy and a combination of wind and buoyancy forces. The wind speeds were low, ranging from 0.0 to 0.5 m/s (0.0 to 1.8 km/h), and the temperature differential tested was in the range of 5.5 to 9.3˚C. The in-duct velocities and centreline …
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Surfactant enhanced mobilisation of non-aqueous phase liquids
… ), a dimensionless quantity relating viscous and buoyancy forces to the capillary forces trapping the NAPL residual. A highly reliable experimental apparatus and procedure were developed to study the effect of flow rate and surfactant concentration on the removal of a residual NAPL. Column studies …
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Computational analysis of magnetohydrodynamics boundary layer flow of nanofluid over a stretching sheet in the presence of heat generation or absorption and chemical reaction
… (Gr). Since Grashof number (Gr) is ratio of buoyancy to viscous forces in the boundary layer it causes an increase in the buoyancy forces relative to the viscous forces which influence the velocity in the boundary layer region. An increase in the heat source/sink parameter (S) results in the …
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