Computational studies of lobed forced mixer flows

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Computational study and experimental comparison of the in-flight particle behavior for an external injection plasma spray process. Velocity measurements downstream of a lobed-forced mixer with different trailing-edge configurations.

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AN IMPROVED LOBED STRUT INJECTOR CONCEPT FOR

Table of contents conference proceedings. The tables of contents are generated automatically and are based on the data records of the individual contributions available in the ind

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Dec 19,  · Family background, early life, education at Cambridge, initial career (1913–1935) Sir William Hawthorne, a mechanical and aeronautical engineer who was a pioneer in the aerodynamics and thermodynamics of gas turbine engines, was born on 22 May 1913 at 11 The Grove, Longbenton, Newcastle upon Tyne.

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Frontiers | A Microfluidic System for Studying the Effects of Disturbed

Such disturbed flow patterns activate pro-inflammatory phenotypes in endothelial cells, damaging the endothelial layer and can lead to atherosclerosis and thrombosis. A variety of models have been developed to study the effect of disturbed flow on endothelial cells. Chaotic Mixer for microchannels.

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Visualization of Flows behind the Lobed Forced Mixers

Flow visualization studies have been conducted using the smoke-wire technique to examine the flows behind lobed forced mixers of different trailing edge configurations (namely a square wave, semi-circular wave and a triangular wave) at a velocity ratio 1:1 across the lobe. The wake region shed by a lobe is found to be the largest with lobe geometry consisting of straight parallel sidewalls

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PDF Computational studies of lobed forced mixer flows

Lobed mixer Fig.1 Typical lobed (forced) mixer exhaust geometry. Paterson [3] measured velocity and turbulence char-acteristics downstream of a lobed mixer using laser-Doppler anemometer and concluded that both the lobe H. Hu et al. Computational Studies of Lobed Forced Mixer Flows.

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NASA - Dryden Technical Report Server

The lobed fuel injector is a device which generates streamwise vorticity, producing high strain rates which can enhance the mixing of reactants while delaying ignition in a controlled manner. The lobed injectors examined in the present study consist of two corrugated plates between which a fuel surrogate CO(2), is injected into coflowing air.

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Performance analysis of lobed nozzle ejectors for high

Watanawanavet S., Optimization of a high-efficiency jet ejector by computational fluid dynamics software, Thesis, Department of Chemical Engineering, May 2005 . Google Scholar; J. Mickelsen et al., The effect of core flow turbulence on planar lobed-mixer nozzle effectiveness, 44th AIAA Aerospace Sciences Meeting and Exhibit ( 2006) . Google Scholar

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PDF FLUID MECHANICS | 5.2. Fully Developed Laminar Flow

The nature of the pipe flow is strongly dependent on whether the flow is laminar or turbulent. The shear stress in laminar flow is a direct result of momentum transfer among the randomly moving molecules (a microscopic phenomenon).

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Computational studies of lobed forced mixer flows | SpringerLink

Full Navier-Stokes Analyses have been conducted for the flows behind the trailing edge of a lobed forced mixer. The governing equations are derived from the time-dependent compressible Navier-Stokes equations and discretized in the finite-difference form. A simple two-layer eddy viscosity model

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On the vorticity characteristics of lobe-forced mixer at

Lobe-forced mixer is one typical example of the passive flow controllers owing to its corrugated trailing edge. Besides the spanwise Kelvin–Helmholtz vortex shedding, streamwise vortices are also generated within its mixing layer. The geometrical configuration of the lobe significantly affects these two types of vortices, which in turn affects the mixing performance of the mixer.

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PDF) Numerical Simulation of Effect of Lobed Nozzle on

The computational study is conducted using the turbulence model Large Fluorescence (LIF) flow visualization techniques. There have Eddy Simulation (LES). The numerical model consists of a jet from been few experiments that have been performed numerically the exit of a circular nozzle and a lobed nozzle (6 lobes).

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Feasibility Studies on Use of Water Mist For Plume

this reason, the use of forced mixer lobes in ejectors has been researched quite extensively over the last fifteen years Yong et al. [14] suggested the mixing enhancement in plume flow using a lobed forced mixer shape. This study clearly indicates that turbulence causes more mixing resulting into the better water evaporation rates [2].

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A Study of Streamwise Vortex Enhanced Mixing in Lobed

The effect of shed streamwise vorticity on mixing in a lobed mixer device has been examined computationally and experimentally. Computational models for assessing the mixing augmentation due to shed streamwise vorticity in laminar and turbulent flows have been developed.

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Full text of "NASA Technical Reports Server (NTRS) 19890004851

Turbofan Forced Mixer Lobe Flow Modeling. ll — Three-Dimensional Inviscid Mixer Analysis (FLO MIX). The forced mixer consists of a convoluted lobe section and a mixing chamber. Consider the situation where the general three-dimensional lobed mixer problem is perturbed about some

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PDF) Velocity and Turbulence Characteristics of Isothermal Lobed

PDF | This work describes an experimental and computational study of flows in model multilobed mixers. A three-dimensional analysis of turbofan forced mixer nozzle aerodynamics demonstrates that the complex flow structure is dominated by geometrically induced secondary flow rather than by

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Hui Hu @ Iowa State University

2021. J152. W. Tian, K Zheng, H Hu, “ Investigation of the wake propagation behind wind turbines over hilly terrain with different slope gradients", Journal of Wind

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Instability of planar free shear layers | Okanagan CFD

The instability of planar free shear layers is an important consideration in a broad range of applications, such as heat exchangers, chemical reactors, building wakes, and aerofoils. A planar free shear layer is primarily unstable through an inviscid Kelvin-Helmholtz mode that exists due to the inflectional shape of the shear-layer velocity profile.

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PDF Aiaa Journal

Paterson1 studied axisymmetric lobed nozzles by taking pres-sure, temperature, and velocity measurements. 7Elliott, J. K., Manning, T. A., Qiu, Y. J., Greitzer, E. M., Tan, C. S., and Tillman, T. G., "Computational and Experimental Studies of Flow in Multi-Lobed Forced Mixers," AIAA Paper

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PDF) Experimental studies of mixing flows with streamwise

The efficacy of integrating the lobed mixer with the core flow deswirling struts to create a single component for reducing the exhaust system length, beyond that attainable through mixer

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Thermal Science - scientific journal [paper: Heat and mass

Hu, H., et al. Passive control on jet mixing flows by using vortex generators. in Proceedings of the Sixth Triennial International Syposium on Fluid Control, Measurement and Visualisation. 2000. Sherbrooke, Canada. Belovich, V.M. and M. Samimy, Mixing processes in a coaxial geometry with a central lobed mixer-nozzle. AIAA Journal, 1997. 35(5).

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Computational and Experimental Study of the Effect of

Sep 18,  · A series of unsteady Navier-Stokes simulations are performed with 0 and 31 degrees of circumferential swirl specified in the core stream of the lobed mixer. Comparison of the axial- and swirling-inflow cases highlights the effect of swirl on the instability-driven transient flow structures that develop within and downstream of the lobed mixer.

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Hermite regularization of the lattice Boltzmann method for

Oct 26,  · K. Habibi, L. Mongeau, D. Casalino, and P.-T. Lew, “ Aeroacoustic study of internal mixing nozzles with forced lobed mixers using a high-Mach subsonic lattice Boltzmann scheme,” in Proceeding of the 20th AIAA-CEAS Aeroacoustics Conference, No.

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Computation and Validation of Parameter Effects on Lobed

Abstract Three-dimensional numerical computation of the flow fields and pumping performances for the lobed mixer-ejector are conducted using full Navier-Stokes equations. In the computation, the inlet of the primary flow uses the mass flowrate boundary condition. The inlet of the second flow and the out-let of the mixing flow use the pressure boundary condition.

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PDF The effect of stiffening tabs on the

Previous studies of lobed mixers have focused on at-design conditions with very little swirl in the core ow. An experimental and numerical study of the 3-D mixing ows of a turbofan engine exhaust. Velocity measurements downstream of a lobed-forced mixer with different trailing-edge congurations.

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Computational modeling of the obstructive lung diseases

Nov 28,  · Asthma and chronic obstructive pulmonary disease (COPD) are characterized by airway obstruction and airflow limitation and pose a huge burden to society. These obstructive lung diseases impact the lung physiology across multiple biological scales. Environmental stimuli are introduced via inhalation at the organ scale, and consequently impact upon the tissue, cellular and sub-cellular scale

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Publications – Sengunthapuram Kandasamy Karthick

SK Karthick, R Sriram: Computational Studies on the Unsteadiness in Hypersonic Shock Induced Leading Edge Separation. 32nd International Symposium on Shock Waves (ISSW 32), National University of Singapore, Singapore; 14/2019. International Conference Meetings

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Physical Review Fluids - Volume 6 Issue 2

Feb 09,  · Environmental fluid mechanics underlies a wealth of natural, industrial, and, by extension, societal challenges. As we strive toward a more sustainable planet, there is a wide range of problems to be tackled, from fundamental advances in understanding and modeling of stratified turbulence and consequent mixing to applied studies of pollution transport in the ocean, atmosphere, and urban

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