Journal of Fluids Engineering: Recent submissions
Now showing items 2381-2400 of 9024
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Strain and Stratification Effects on the Rapid Acceleration of a Turbulent Mixing Zone
(The American Society of Mechanical Engineers (ASME), 2014)We consider the problem of a turbulent mixing zone (TMZ), initially submitted to coupled effects of axisymmetric strain and stratification, then subsequently accelerated. The TMZ grows in the latter stage due to a rapid ... -
Ejecta Production and Transport From a Shocked Sn Coupon
(The American Society of Mechanical Engineers (ASME), 2014)When a shock interacts with a Sn coupon, micrometerscale particulate fragments, called ejecta, are usually formed and emitted from its free surface. Understanding the characteristics of such ejecta is of great importance ... -
Unstably Stratified Homogeneous Turbulence as a Tool for Turbulent Mixing Modeling
(The American Society of Mechanical Engineers (ASME), 2014)In this paper, we propose a kind of buoyancydriven flow leading to unstably stratified homogeneous (USH) turbulence. This approach is developed in the context of incompressible Navier–Stokes equations under Boussinesq ... -
Models for Crenulation of a Converging Shell
(The American Society of Mechanical Engineers (ASME), 2014)We describe two models for the growth of perturbations on the inner surface of a converging shell: one for a solid shell and one for a shell of incompressible fluid. We consider the cases of both cylindrically and spherically ... -
Development and Validation of Computational Fluid Dynamics Models for Initial Stages of Cavitation
(The American Society of Mechanical Engineers (ASME), 2014)Various computational fluid dynamics (CFD) models employed for cavitating flows are substantially based on semiempirical assumptions about cavitation forms and liquid flows around cavitating bodies. Therefore, the model ... -
Modeling of Reynolds Stress Models for Diffusion Fluxes Inside Shock Waves
(The American Society of Mechanical Engineers (ASME), 2014)In Reynolds stress models (RSM), the use of first gradient closures to model diffusion fluxes may lead to a nonconvergence with mesh refinement, especially if the flow experiences episodes of dominant compressibility effects ... -
Special Issue on the 13th International Workshop on the Physics of Compressible Turbulent Mixing
(The American Society of Mechanical Engineers (ASME), 2014)The study of compressible turbulent mixing associated with RichtmyerMeshkov (RM), RayleighTaylor (RT), and KelvinHelmholtz (KH) instabilities is motivated by diverse applications in science and engineering, including ... -
Statistics for Assessing Mixing in a Finite Element Hydrocode
(The American Society of Mechanical Engineers (ASME), 2014)Direct numerical simulation of mixing processes (RayleighTaylor and RichtmyerMeshkov instabilities) is computationally expensive due to the need to resolve turbulent structures on small scales. Hence, it is common practice ... -
Combined Effect of Viscosity, Surface Tension and Compressibility on Rayleigh Taylor Bubble Growth Between Two Fluids
(The American Society of Mechanical Engineers (ASME), 2014)The combined effect of viscosity, surface tension, and the compressibility on the nonlinear growth rate of RayleighTaylor (RT) instability has been investigated. For the incompressible case, it is seen that both viscosity ... -
Numerical Analyses of Cavitating Flow in a Pelton Turbine
(The American Society of Mechanical Engineers (ASME), 2014)Erosion and wear of hydraulic surfaces are frequent problems in hydraulic turbines, which lead to a decrease of the performance in time and/or in extreme cases to the rotor mechanical failure. These circumstances have ... -
Detection of Cavitation in a Venturi Injector With a Combined Method of Strain Gauges and Numerical Simulation
(The American Society of Mechanical Engineers (ASME), 2014)The fertilizer suction capability of a Venturi injector is dependent on the vacuum pressure in the throat portion. As the vacuum level drops below the saturation vapor pressure, the pressure decreases to a particular value ... -
An Experimental Investigation of Aspect Ratio and Incidence Angle Effects for the Flow Around Surface Mounted Finite Height Square Prisms
(The American Society of Mechanical Engineers (ASME), 2014)The flow around a surfacemounted finiteheight square prism was investigated using a lowspeed wind tunnel. The experiments were conducted at a Reynolds number of Re = 7.3 أ— 104 for prism aspect ratios of AR = 3, ... -
Numerical Simulation of Bubble Cluster Induced Flow by Three Dimensional Vortex in Cell Method
(The American Society of Mechanical Engineers (ASME), 2014)The behavior of air bubble clusters rising in water and the induced flow field are numerically studied using a threedimensional twoway coupling algorithm based on a vortexincell (VIC) method. In this method, vortex elements ... -
An Integral Solution for Skin Friction in Turbulent Flow Over Aerodynamically Rough Surfaces With an Arbitrary Pressure Gradient
(The American Society of Mechanical Engineers (ASME), 2014)The combined law of the wall and wake, with the inclusion of the “roughness depression function†for the inner law in the “Log†region, is used as the inner coordinates' velocity profile in the integral form of the ... -
Turbulent Features in the Coherent Central Region of a Plane Water Jet Issuing Into Quiescent Air
(The American Society of Mechanical Engineers (ASME), 2014)A plane water jet issuing into quiescent air at a Reynolds number of 2.5 أ— 105 is experimentally studied using phase Doppler anemometry (PDA). The plane water jet contains a coherent central region, which is situated ... -
Plane Thermal Transpiration of a Rarefied Gas Between Two Walls of Maxwell Type Boundaries With Different Accommodation Coefficients
(The American Society of Mechanical Engineers (ASME), 2014)Plane thermal transpiration of a rarefied gas between two walls of Maxwelltype boundaries with different accommodation coefficients is studied based on the linearized Boltzmann equation for a hardsphere molecular gas. The ... -
Under Expanded Gaseous Flow at a Straight Micro Tube Exit
(The American Society of Mechanical Engineers (ASME), 2014)This paper focuses on underexpanded gaseous flow at a straight microtube exit. The pitot total pressure of gas flow (jet) in the downstream region from a straight microtube exit was measured by a total pressure pitot tube ... -
Instability of Viscoelastic Annular Liquid Jets in a Radial Electric Field
(The American Society of Mechanical Engineers (ASME), 2014)Research on the instability of viscoelastic annular liquid jets in a radial electric field has been carried out. The analytical dimensionless dispersion relation between unstable growth rate and wave number is derived by ... -
On Topology of Flow in a Turbine Cascade
(The American Society of Mechanical Engineers (ASME), 2014)The present study focuses on the study of topological properties of flow in a turbine cascade. Criticalpoint theory is used to explain the flow phenomenon. Examination and analysis of skinfriction line patterns on ... -
Numerical Investigation of Multistaged Tesla Valves
(The American Society of Mechanical Engineers (ASME), 2014)The Tesla valve is a passivetype check valve used for flow control in microor minichannel systems for a variety of applications. Although the design and effectiveness of a singular Tesla valve is somewhat well understood, ...