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Showing 1 to 19 of 19 for “"Developing Flow"”.
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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
… them, and the ability to accurately predict the flow and heat transfer within these channels leads to higher design reliability and prevention of blade failure resulting from local thermal loading. Prediction of the flow through these channels is challenging, however, because the flow is highly …
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Convective heat transfer in rotating, circular channels
Nusselt number values for flow in a rotating reference frame are obtained through computational fluid dynamic (CFD) analysis for Rossby numbers Ro ~1-4 and Reynolds numbers Re ~1,000-2,000. The heat-transfer model is first validated according to Nusselt number correlations for laminar, developing …
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Numerical Simulations in Electro-osmotic Flow
The developing flow field in a parallel plate microchannel, induced by wall motion, has been modeled numerically. This type of flow simulates the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios (Z). The physics of the …
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Investigation of Fouling in Wavy-Fin Exhaust Gas Recirculators
… temperature gradient. Subsequently, periodic and developing flow simulations are performed on a wavy channel geometry, a common EGR design for various Reynolds numbers and thermal boundary conditions. Constant heat flux boundary condition is used in the periodic fully-developed calculations, which …
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Tip leakage flow, heat transfer and blade lifing in a jet engine turbine
… Navier-Stokes code (MEFP) was used to calculate developing flow and heat transfer in turbine tip gaps. Successful calculations of the heat transfer to a model turbine blade tip were obtained with a Prandtl mixing length turbulence model. The calculations revealed details of the flow development …
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Evaluation of local heat transfer and friction factors in a U-type compound parabolic collector operating as a thermosyphon
… and an evacuated tube receiver with a direct flow U-shaped absorber tube. Although extensive research in the literature has focused on reflector designs and optical components, the heat transfer characteristics and flow patterns within the absorber tube have not been thoroughly investigated. …
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Enabling collaboration in the sketching domain
… domains, such as designing electrical circuits, developing flow charts, and modeling simple mechanical devices, rely heavily on the ability to produce sketches efficiently in order to bring out the most salient features. Engineers working in these domains usually rely on pen and paper to generate …
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Laminar viscous resuspension in two-dimensional channels
… and the momentum equations for incompressible flow are solved for developing flow using finite element method. The parameters in this study are ratio of particle diameter to channel height d/h, Reynolds number Re, Froude number Fr, uniform inlet particle volume fraction [Phi]_0, and …
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Investigation and characterization of pressure drop in evenly spaced twisted tapes
… was to characterize the development of swirl flow in sequential twisted tapes. The second objective was to create a correlation for the Darcy's friction factor as a function of the Reynolds number (Re), tape twist ratio (y), and tape spacing (s) which could be used for both Ferroni's work and …
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Evaluation Of Thermophysical Properties, Friction Factor And Heat Transfer Of Alumina Nanofluid Flow In Tubes
<p>Various thermophysical properties, fluid flow parameter and heat transfer characteristics were measured for nanofluid with 6% volume concentration of solid Al2O3 nanoparticles in water. Thermal conductivity measurements showed that there is a definite enhancement in thermal conductivity of the …
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Fluid flow measurement using correlation techniques
… cross correlation method to measurement of flow under steady and pulsating flow conditions is investigated. The factors to be considered in applying this technique to different flow systems are discussed and its advantages over the conventional techniques are highlighted. The method involves …
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The Influence of the Slot Aspect Ratio on the Flow Field of Synthetic Jets
… there has been a surge of research interest in developing flow-controlling devices, which can provide appreciable aerodynamic performance gain, do not require a large energy input from the operating device, and are cheap and lightweight at the same time. The synthetic jet actuator is one such …
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The flow stability of linear low-density polyethlene at polymer and metal interfaces
… the interface behavior in stratified bicomponent flow has been examined. First, the factors and conditions leading to the onset of surface melt fracture in linear low-density polyethylene (LLDPE) were identified using fluoro-elastomer (FE) as a blending additive and as a die coating in two …
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The Effects of Free Stream Turbulence on the Flow Field through a Compressor Cascade
The flow through a compressor cascade with tip leakage has been studied experimentally. The cascade of GE rotor B section blades had an inlet angle of 65.1º, a stagger angle of 56.9º, and a solidity of 1.08. The final turning angle of the cascade was 11.8º. This compressor configuration was …
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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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Three-dimensional turbulence mechanisms in a supersonic separated/reattaching longitudinal cylinder wake
… identification of turbulence mechanisms in the flow regions both upstream of, and in the immediate vicinity of reattachment of the separated shear layer, as these mechanisms are the main drivers of critical flow properties, such as the low pressure in the separated region. This work was …
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Flow and separation of the oil from compressor discharge to external separator
… at the compressor discharge are quantified by flow visualization techniques in this dissertation. Oil droplets are formed by oil film breakup during the periodic reed valve movement. The oil droplets are then entrained by the refrigerant vapor inside the discharge plenum and leave the …
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Thermal designs, models and optimization for three-dimensional integrated circuits
… the accuracy, our correlations are based on the developing flow model and derived from numerical simulation data on a sub- set of multiple channel parameters. Our model achieves 57% less error in Nusselt number and 45 % less error in pressure drop for channels with inlet width 100-400 μm compared …
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The rheological complexity of waxy crude oils : yielding, thixotropy and shear heterogeneities
… of waxy crude oil rheology is critical for developing flow assurance strategies, which can in turn ensure continuous production of precipitate-containing crude oils under adverse conditions. The three phenomena studied are, first: shear heterogeneities, i.e. the manifestation of wall slip, …