Journal of Fluids Engineering: Recent submissions
Now showing items 841-860 of 9024
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Experimental Study of Flow Structure in Converging–Diverging Axisymmetric Geometry
(The American Society of Mechanical Engineers (ASME), 2020)Control valves, nozzles, and other mechanical flow constricting constructions often introduce highly turbulent flow downstream of vena contracta. When solid particles are present in the fluid stream erosion can occur due ... -
An Eddy-Viscosity Model Sensitized to Curvature and Wall-Roughness Effects for Reynolds-Averaged Closure
(The American Society of Mechanical Engineers (ASME), 2020)This paper presents a new extension of the realizable K−ε model that accounts for streamline curvature, system rotation, and surface roughness. The model is a type of realizable K−ε model, but the transport equations and ... -
Ultrafast X-Ray Computed Tomography Imaging for Hydrodynamic Investigations of Gas–Liquid Two-Phase Flow in Centrifugal Pumps
(The American Society of Mechanical Engineers (ASME), 2020)Gas entrainment into centrifugal pumps decreases pump performance and may raise safety issues, e.g., through insufficient cooling. Although there is some phenomenological knowledge in the form of correlations between ... -
An OpenFOAM-Based Extension of Low-Re k–ε Model to the Partially Averaged Navier–Stokes Methodology for Simulating Separated Flows With Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2020)The partially averaged Navier–Stokes (PANS) methodology is known to give improved performance over the traditional Reynolds-averaged Navier–Stokes (RANS) formulation at an affordable computational cost. Over the years, ... -
Direct Numerical Simulation of the Flow Through a Randomly Packed Pebble Bed
(The American Society of Mechanical Engineers (ASME), 2020)The proposition for molten salt and high-temperature gas-cooled reactors has increased the focus on the dynamics and physics in randomly packed pebble beds. Research is being conducted on the validity of these designs as ... -
Effect of Intersection Angle and Wettability on Droplet Generation in Microfluidic Flow-Focusing Device
(The American Society of Mechanical Engineers (ASME), 2020)This article investigates the dynamics of droplet generation process in a microfluidic flow-focusing device under the effect of geometry altered by the intersection angle (φ), which the flanking inlets make with central ... -
Experimental Investigation of Various Regimes of Bubble Formation and Growth—A Theoretical View of Double Coalescence Regime
(The American Society of Mechanical Engineers (ASME), 2020)Bubble formation and growth in a liquid is an important process in many industries. Bubble formation regime determines the essential characteristics of the bubble formation process such as bubble volume, shape, and formation ... -
Numerical Prediction of Various Cavitation Erosion Mechanisms
(The American Society of Mechanical Engineers (ASME), 2020)Numerical prediction of cavitation erosion is a great scientific and technological challenge. In the past, many attempts were made—many successful. One of the issues when a comparison between a simulation and erosion ... -
Modeling Bubble Motions by Underwater Explosion in a Centrifuge
(The American Society of Mechanical Engineers (ASME), 2020)Bubble oscillations generated by underwater explosions (UNDEX) can cause considerable damage to nearby marine vehicles or hydraulic structures as the energy inside the bubble is comparable to that of a shock wave. Since ... -
Pressure Drop and Flow Development in the Entrance Region of Microchannels With Second-Order Velocity Slip Condition and the Requirement for Development Length
(The American Society of Mechanical Engineers (ASME), 2020)In this investigation, Lfd* and Δp in the entrance region of circular and parallel plate microchannels have been determined for 10−2≤Re≤104 and 10−4≤Kn≤0.2, employing the second-order velocity slip condition at the wall ... -
Impact of a Plate on an Asymmetric Water Wedge
(The American Society of Mechanical Engineers (ASME), 2020)The impacts of a plate on an asymmetric water wedge with constant and varying speeds are studied in this paper by considering the fluid to be incompressible, inviscid, and weightless; the effect of surface tension to be ... -
Experimental Characterization of Sprays in a Recessed Gas-Centered Swirl Coaxial Atomizer
(The American Society of Mechanical Engineers (ASME), 2020)The characteristics of sprays from a recessed gas-centered swirl coaxial atomizer (RGCSCA) with gas to liquid momentum flux ratio, J of the spray in the range of 2–66 are studied experimentally through the analysis of spray ... -
Investigation Into the Phenomenon of Flow Deviation in the S-Shaped Discharge Passage of a Slanted Axial-Flow Pumping System
(The American Society of Mechanical Engineers (ASME), 2020)A remarkable flow deviation phenomenon exists in the S-shaped discharge passage of a slanted axial-flow pumping system. In order to reveal the characteristics and development process of the deviating flow, numerical ... -
Evaluation of a Dynamic Transfer Matrix for a Hydraulic Turbine
(The American Society of Mechanical Engineers (ASME), 2020)It is well known that hydraulic machines experience various types of flow instabilities causing a negative influence on the system under off-design operations. The transfer matrix method correlating the flow properties in ... -
Capillary Filling Dynamics of Electromagnetohydrodynamic Flow of Non-Newtonian Fluids
(The American Society of Mechanical Engineers (ASME), 2020)In this work, we aim to develop a mathematical model for capillary filling dynamics of electromagnetohydrodynamic flow of non-Newtonian fluids. An axially applied electric field and a transverse magnetic field are considered ... -
Experimental Investigation on Pressure Fluctuation Reduction in a Double Suction Centrifugal Pump: Influence of Impeller Stagger and Blade Geometry
(The American Society of Mechanical Engineers (ASME), 2020)The reduction in pressure fluctuation can suppress noise, balance the radial and axial forces, and restrain the vibration level of a centrifugal pump. Impeller stagger and blade geometry influence the pressure fluctuation ... -
Hydraulic Model for Accelerated Flows Through Porous Medium in the Form Drag-Dominated Regime
(The American Society of Mechanical Engineers (ASME), 2020)The pressure drop for steady uniform flows (UF) through low permeability porous media—packed bed of particles (balls and rods) and sand (K<10−7m2)—is predicted using the existing global Hazen-Dupuit-Darcy (HDD) hydraulic ... -
In Memoriam: Dave Stock—Teacher and Pioneer Researcher in Multiphase Flow
(The American Society of Mechanical Engineers (ASME), 2020)It is with profound sadness that we report the death of a much loved and greatly respected colleague and friend—Professor David E. Stock, Washington State University.In a career spanning nearly 40 years “Dave” performed ... -
Optimization of a Cyclone Using Multiphase Flow Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2020)The U.S. Department of Energy National Energy Technology Laboratory's (NETL) 50 kWth chemical looping reactor (CLR) has an underperforming cyclone, which was designed using empirical correlations. To improve the performance ... -
Suction Vortices in a Pump Sump—Their Origin, Formation, and Dynamics
(The American Society of Mechanical Engineers (ASME), 2020)The origin, formation mechanism, and dynamics of suction vortices in a pump sump have been clarified by large eddy simulation (LES) applied to two different computational models. The first one is a pump-sump model with ...