Read Online Influence of Geometry and Flow Variation on Jet Mixing and No Formation in a Model Staged Combustor Mixer with Eight Orifices - National Aeronautics and Space Administration file in PDF
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The influence of anode geometry, anode resistivity, inter-electrode distance and gas flow on the threshold currents that mark the corona-to-glow and glow-to-spark transitions is investigated. The experimental data are backed up by an analytical treatment of ionization instability development within a local current spot on metallic and resistive.
Fluid flow behaviour in paper is of increasing interest due to the advantages and expanding use of microfluidic paper-based analytical devices (known as µpads). Applications are expanding from those which often have low sample fluid volumes, such as diagnostic testing, to those with an abundance of sample fluid, such as water quality testing.
The geometry of scour may influence the turbulent flow pattern in the pool, the dynamic loadings acting on the rock interface, and the pressures propagating inside rock joints. Up to present, dynamic impact pressures at the pool bottom have been investigated mainly in pools with flat bottom and are therefore described as function of the pool.
A comparison between numerical simulations and wind tunnel modelling has been performed to examine the variation with streamwise aspect ratio (width/height, w/h) of the mean flow patterns in a street canyon. For this purpose a two-dimensional (2-d) cavity was subjected to a thick turbulent boundary layer flow perpendicular to its principal axis.
The difference in flow resistance between these two stream types is related to the ways in which lwd influences step geometry and how step geometry in turn influences spill resistance. The fact that lwd steps were associated with high spill resistance suggests that lwd is an important component of step‐pool streams because it creates deep.
Nozzle orifice geometry is known to influence the flow inside the nozzle, which in turn affects the spray development, thus impacting combustion and emission.
Abstract in the framework of a research project on sedimentation of shallow reservoirs by suspended load, the influence of reservoir geometry on sediment transport, flow and deposition patterns are being studied. Recirculating flows in shallow rectangular reservoir with different shape were investigated in order to study the effect of geometry.
This paper describes a computational and experimental investigation of flow in a proto-type model geometry of a fully occluded 45 deg distal end-to-side.
The aim of this study is to evaluate the influence of design parameters on the unsteady flow in a forward-curved centrifugal fan and their impact on the aeroacoustic behavior. To do so, numerical and experimental studies have been carried out on four centrifugal impellers designed with various geometrical parameters. The same volute casing has been used to study these impellers.
20 jul 2019 the last feature of pump stator: geometry of flow area affects the bep (best efficiency point) location on the pump flow characteristic.
13 jan 2020 engine: influence of geometry and flow conditions 2019-36-0160 the finite differences method was applied for two fin geometry (annular.
Therefore, the tangential velocity of the gas flow, which relates to the pressure drop, must be increased in order to increase cyclone efficiency.
The objective of the numerical study is to explore the effects of transverse magnetic field on heat transfer and fluid flow characteristics in a trapezoidal microchannel heat sink. The effects of the channel bottom width, channel top width, channel height and hartmann number on heat transfer and fluid flow characteristics are widely investigated.
Influence of geometry and ventilation boundaries on simulation of the flow outside a room set-up in laboratory environment. Department of fire safety engineering and systems safety lund university, sweden report 5381, lund 2012.
These differences are related to (1) the relative magnitude of each component of flow resistance, (2) the role of lwd on step geometry, (3) the influence of step geometry on flow resistance, and (4) the ways in which step‐pool streams re‐arrange available bed material to optimize energy expenditure.
Jet mixing into a heated cross flow in a cylindrical duct - influence of geometry and flow variations.
In particular, the study focuses the attention on the influence of the vane geometry on the oscillations of the flow rate produced by the volume variation of both under-vane pockets and displaced chambers, that is known as one of the most relevant sources of noise in hydraulic systems.
27 sep 2018 due to the increasing demand for higher efficiencies of centrifugal compressors, numerical optimization methods are becoming more and more.
The effects of fluid flow geometry on the physics of fluid are of prime importance as optimisation of the geometry could lead to improved fluid flow for various.
Fingerprint dive into the research topics of 'influence of the geometry on the two- and three-dimensional dynamics of the flow in a 180° sharp bend'.
The present work is to study the influence of tool geometry on material flow during friction stir welding in two dissimilar aluminium alloys. Various types of tool geometries used for the process are triangular, square, pentagon and hexagon.
15 jun 2017 turbulent flow separation induced by a protuberance on one of the walls of an otherwise planar channel is investigated using direct numerical.
This paper investigates the influence of disc tip geometry, including its profile and relative height, on the aerodynamic performance and flow characteristics of one-to-one and one-to-many multichannel tesla turbines.
Induction flow within engine geometries and to evaluate flow changes due to geometrical variations of the engine.
A numerical study of the influence of disc geometry on the flow and heat transfer in a rotating cavity. Proceedings of the asme 1990 international gas turbine and aeroengine congress and exposition.
Tank geometry and inlet and outlet characteristics greatly influence the flow pattern in the tank, determining the presence of dead volumes and bypass currents. Circular tanks provide a rotating flow, while rectangu-lar tanks, where water flows from the upper to the lower end, are designed to provide a plug-flow pattern.
The influence of the bladder geometry to the bladder pressure and urine flow abstract: urinary bladder having a function of storing urine, covered by mucosa and having muscle layer on its wall is a global organ.
With the purpose of controlling the sedimentation in shallow reservoirs, the effects of the geometry on flow pattern and deposition processes were investigated.
Influence of impingement edge geometry on cavity flow oscillations.
The role of major flow parameters: shear stress, secondary flow, recirculation regions, flow stagnation regions, and flow separation, was examined. Results show a complex interplay among connection geometry, flow rate ratio and the types and effects of the various flow parameters described above.
Two‐phase flow in large annular ducts is very common in industrial applications. Nevertheless, many two‐phase‐flow phenomena in such a geometry have not been fully understood. This article addresses an investigation on the effects of duct geometry and liquid viscosity on vertical upward annular‐duct two‐phase flows.
This work investigates in greater detail than in previous studies the effect of geometry on the relationship between emitted flow rate and applied potential.
Abstract fluid dynamics suggests that orifice geometry is a determinant of discharge properties and, therefore, should influence empiric constants in formulas (such as the gorlin formula) to calculate stenotic valve area.
Relations between u-tube condition, surface topography and flow characteristics. Fluid flow tests based on cfd and piv methods concerning the u-tubes.
This paper investigates the influence of disc tip geometry, including its profile and relative height, on the aerodynamic performance and flow characteristics of one-to-one and one-to-many.
The influence of out-of-plane geometry on pulsatile flow within a distal. End-to- side in the planar geometry the stagnation point follows a straight-line path.
26 nov 2020 request pdf influence of geometric parameters of the flow fields on the performance of a pem fuel cell.
Influence of geometry and ventilation boundaries on simulation of the flow outside a room set-up in laboratory environment hemmati, parinaz in lutvdg/tvbb vbrm05 20121 division of fire safety engineering division of risk management and societal safety.
The influence of flow, geometry, wall thickness and material on acoustic wave resonance in water-filled piping.
Influence of the flow field geometry the dimensions of flow field channels and ribs are a crucial factor for optimizing cell performance due to their influence.
The influence of the pin geometry on material flow in fsw was studied. When the column and taper pin are used, there is a 'hole' defect in the vertical mixing plot. When the taper with screw thread pin is used, the vertical material flow is more obvious and there is no distinct 'hole'.
The effects of impeller type on flow patterns for different impeller sizes, tank bottom shapes, off-bottom clearances, and fluid viscosities are examined.
This paper focuses on evaluation of differences in the newly manufactured u-tubes and ones after operation. Differences in geometry and internal surface roughness were investigated and a flow simulation was carried out in the ansys fluent software, where properties such as flow nature, maximum velocity and pressure drop were examined.
Optimization studies for axial flow turbines comprised of the influence of geometric.
1 jan 2019 to investigate the influence of geometric characteristics of deformable rough fractures under confining stresses on the behaviors of non-darcy.
Influence of geometric parameters of the flow fields on the performance of a pem fuel cell.
A time resolved particle image velocimetry (tr-piv) study of the flow emitted to the surroundings in each case is obtained for each airway and exhalation.
Influence of river channel geometry in stream flow modelling and guidelines for field investigation hongbo zhang key laboratory of tibetan environment changes and land surface processes, institute of tibetan plateau research, chinese academy of sciences, beijing, china.
These research include, first and foremost, a qualitative and quantitative description of the impact of fluid flow on accelerating changes in surface morphology, that can lead to a decrease of an efficiency of a heat transfer or even device failure.
Influence of geometry on the mean flow within urban street canyons – a comparison of wind tunnel experiments and numerical simulations.
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