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.
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Showing 1 to 20 of 272 for “"Flow regimes"”.
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Flow regimes in canopy turbulence
This thesis investigates turbulent flow regimes over canopies using direct numerical simulations. The term `canopy' refers to a group of substantial roughness elements protruding into the flow, which generally results in two distinct regions of interest: the near-canopy region, where the flow is …
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Trailing Edge Aerodynamics: Flow Regimes, Geometry and Loss
The flow at the trailing edge of a turbine blade at transonic air velocities can be extremely complex. Solid trailing edges can shed vortices in a manner known as transonic vortex shedding, where vortices form very close to the trailing edge and cause large trailing edge shear layer deflection. …
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Flow regimes and dryout in horizontal, heated tubes
Thesis (Mech. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Modelling of disturbed flow regimes in aspirated pipe systems
… possible "balance" (the distribution of hole flow rates and hence the effective smoke-sensitivity throughout the zone), commensurate with the lowest possible smoke "transport time" (from a hole to the detector). These two objectives are often in conflict. Air flowing into the sampling hole …
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CFD modelling of pipe erosion under multiphase flow regimes.
… efficiency of pipe-lines and other related flow systems. Proper knowledge of the flow characteristics, particle behaviour and geometric effects is very important in the accurate prediction of erosion rates and location. This study focuses on predicting erosion under complex multiphase flow …
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CFD modelling of flow-induced vibration under multiphase flow regimes.
Internal multiphase flow-induced vibration (MFIV) in pipe bends poses serious problems in oil and gas, nuclear and chemical flow systems. The problems include: high amplitude displacement of the pipe structure due to resonance; fatigue failure due to excessive cyclic stress, induced by fluctuating …
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Heat transfer and flow regimes during condensation in horizontal tubes
An experimental study of heat transfer and flow regimes during condensation of refrigerants in horizontal tubes was conducted. Measurements were made in smooth, round tubes with diameters ranging from 3.14 mm to 7.04 mm. Four refrigerants were tested: R-12, R-22, R-134a, and azeotropic blends of …
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Flow and particle manipulation across flow regimes via shape modulation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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ALTERATIONS OF RIVER FLOW REGIMES IN THE NORTHERN ROCKY MOUNTAINS, USA
… if any, alterations have occurred in the annual flow regimes. By comparing the different results from the natural and anthropogenically-modified river basins, I was able to distinguish the impacts that climate change and anthropogenic modifications have had on flow regimes in the Northern Rocky …
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ALTERATIONS OF RIVER FLOW REGIMES IN THE NORTHERN ROCKY MOUNTAINS, USA
… if any, alterations have occurred in the annual flow regimes. By comparing the different results from the natural and anthropogenically-modified river basins, I was able to distinguish the impacts that climate change and anthropogenic modifications have had on flow regimes in the Northern Rocky …
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Computational Studies of Buffet and Fluid-Structure Interaction in Various Flow Regimes
… in the subsonic, transonic, and supersonic regimes. Buffet has been observed in experiments and various computational studies, and its underlying physics are not well-established. The goal of this document is to provide insight into various configurations which produce buffet and attempt to …
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The effect of flow regimes in the distillation of systems containing two liquid phases
… of Porter & Wong (17). i.e. with no liquid cross flow. A light transmission technique was used to measure the transition from spray regime to bubbly regime. The effect of tray thickness and the ratio of hole diameter to tray thickness on the transition was evaluated using trays of the same hole …
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Evaluating Ecological Influences of Altered Flow Regimes Using Two- and Three-Dimensional Hydrodynamic Models
… channel topography. Fluctuating, complex flow patterns near river obstructions such as boulders and large woody debris provide unique habitat for many aquatic organisms. Numerical modeling of the flow structures surrounding these obstructions is challenging, yet it represents an important …
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Effect of inclination on pressure drop and flow regimes in large flattened-tube steam condensers
… of the inclination effect on pressure drop and flow regime during condensation of steam in a large flattened tube used in air-cooled condensers (ACC) for power plants. Steam with mass flux of about 7 kg m-2 s-1 was condensed inside a 10.7 m long, flattened test tube with inclination angle varied …
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Transition between Flow Regimes in Porous Media Using Magnetic Resonance Velocimetry: From Laminar to Turbulent
… to investigate the transition between different flow regimes in porous media. The complete transition spectrum of single-phase flow, from creeping flow to inertial, unsteady laminar, and turbulent flow regimes, was examined in sphere packings. Further understanding of the fundamental fluid …
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Computational fluid dynamics (CFD) modelling of critical velocity for sand transport flow regimes in multiphase pipe bends.
… hydrocarbon production. Knowledge of the flow characteristics of solid particles in fluids when transported in pipelines is important, in order to accurately predict solid particle deposition in pipelines. This thesis presents the development of a three-dimensional (3D) computational fluid …
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Numerical Study of Convective Heat Transfer in Flat Tube Heat Exchangers Operating in Self-Sustained Oscillatory Flow Regimes
… of flat tube heat exchanger devices operating in flow regimes in which self-sustained oscillations occur were performed. The unsteady flow regimes were transition flow regimes characterized by cyclic variations of flow parameters such as stream-wise or cross-stream velocity. A computer code was …
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