Journal of Fluids Engineering: Recent submissions
Now showing items 821-840 of 9024
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Performance Degradation and Flow Instability of Axial-Flow Fan Due to Upstream Obstacle
(The American Society of Mechanical Engineers (ASME), 2020)This paper elucidates the performance degradation and flow instability of an axial fan caused by the presence of disk-shaped obstacles upstream of the fan, such as wall surfaces. The increase in pressure loss and the ... -
Hybrid Optical-Flow-Cross-Correlation Method for Particle Image Velocimetry
(The American Society of Mechanical Engineers (ASME), 2020)A hybrid method for particle image velocimetry (PIV) is developed to overcome the limitations of the optical flow method applied to PIV images with large displacements. The main elements of the hybrid method include a ... -
A Simple Approach for Vortex Core Visualization
(The American Society of Mechanical Engineers (ASME), 2020)We propose a method to visualize vortex cores based on manipulation of the pressure field produced by isolated vortices in incompressible flow. Under ideal conditions, the function D=2|∇p|/∇2p yields an approximate distance ... -
On the Numerical Behavior of RANS-Based Transition Models
(The American Society of Mechanical Engineers (ASME), 2020)A comparison of several Reynolds-averaged Navier–Stokes (RANS) based transition models is presented. Four of the most widespread models are selected: the γ−Reθ, γ, amplification factor transport (AFT), and kT−kL−ω models, ... -
Measurements of the Flow in the Vicinity of an Additively Manufactured Turbine Leading-Edge Using X-Ray Particle Tracking Velocimetry
(The American Society of Mechanical Engineers (ASME), 2020)X-ray particle tracking velocimetry (PTV) is performed, for the first time, to measure the velocity field inside a leading-edge of a turbine blade made by laser-additive-manufacturing (LAM) process. The traditional showerhead ... -
Fluid–Structure Interaction Study and Flowrate Prediction Past a Flexible Membrane Using Immersed Boundary Method and Artificial Neural Network Techniques
(The American Society of Mechanical Engineers (ASME), 2020)Many microfluidics-based applications involve fluid–structure interaction (FSI) of flexible membranes. Thin flexible membranes are now being widely used for mixing enhancement, particle segregation, flowrate control, drug ... -
Cavitating Flow Suppression for a Two-Phase Liquefied Natural Gas Expander Through Collaborative Fine-Turning Design Optimization of Impeller and Exducer Geometric Shape
(The American Society of Mechanical Engineers (ASME), 2020)Cryogenic liquid turbine expanders have been increasingly used in liquefied natural gas (LNG) production plants to save energy. However, high-pressure LNG commonly needs to be throttled to or near a two-phase state, which ... -
Reynolds Number Dependence of Zero Pressure Gradient Turbulent Boundary Layers Including Third-Order Moments and Spatial Correlations
(The American Society of Mechanical Engineers (ASME), 2020)Measurements were made in zero pressure gradient turbulent boundary layers on a smooth wall, at momentum thickness Reynolds numbers, ranging from 800 to 6340. The experiments were conducted in a recirculating water tunnel. ... -
Boltzmann–Curtiss Description for Flows Under Translational Nonequilibrium
(The American Society of Mechanical Engineers (ASME), 2020)Continuum-based theories, such as Navier–Stokes (NS) equations, have been considered inappropriate for flows under nonequilibrium conditions. In part, it is due to the lack of rotational degrees-of-freedom in the ... -
On the Unsteady Wake of a Rigid Plate Under Constant Acceleration and Deceleration
(The American Society of Mechanical Engineers (ASME), 2020)Laboratory experiments are performed to explore distinct features of the unsteady wake induced by a rigid plate undergoing a series of accelerated and decelerated phases in a quiescent water tank. Each plate motion pattern ... -
Near Wake Development Behind Marine Propeller Model in Presence of Freestream Turbulence
(The American Society of Mechanical Engineers (ASME), 2020)Three-dimensional particle image velocimetry (PIV) experiments were conducted in the immediate near wake and up to seven diameters downstream of a three-bladed marine propeller model operating in two different inflow ... -
Analysis and Optimization of Staggered Partial Diffuser Vanes in a Centrifugal Pump
(The American Society of Mechanical Engineers (ASME), 2020)A performance analysis and three-objective design optimization were performed for the staggered partial diffuser vanes in a centrifugal pump using three-dimensional Reynolds-averaged Navier–Stokes equations. First, the ... -
Cavitation-Vortex-Pressure Fluctuation Interaction in a Centrifugal Pump Using Bubble Rotation Modified Cavitation Model Under Partial Load
(The American Society of Mechanical Engineers (ASME), 2020)Cavitation is a complicated phenomenon in the centrifugal pump. In this work, the improved unsteady calculation model based on bubble-rotation-based Zwart–Gerber–Belamri (BRZGB) cavitation model is used to investigate the ... -
Spatiotemporal Evolution of Rotational Natural Cavitation in Rotational Supercavitating Evaporator for Desalination
(The American Society of Mechanical Engineers (ASME), 2020)A novel desalination device named rotational supercavitating evaporator (RSCE) has been proposed and designed by utilizing supercavitation effect. With special focus on the spatiotemporal evolution of rotational natural ... -
Effects of the Cross-Sectional Area of a Volute on Suction Recirculation and Cavitation in a Centrifugal Pump
(The American Society of Mechanical Engineers (ASME), 2020)The effects of the cross-sectional area of a volute on suction recirculation and cavitation in a centrifugal pump were investigated. The pump performance and fluid flow were analyzed using both steady and unsteady ... -
Mixing Efficiency Comparison of Symmetric and Asymmetric Airfoil Blades in a Continuous Stirred Tank Reactor
(The American Society of Mechanical Engineers (ASME), 2020)This study compared mixing efficiencies of the symmetric and asymmetric airfoil blades in a continuous stirred tank reactor (CSTR) at various mixing velocities and angles of attack. The symmetric airfoil blades (NACA0009 ... -
Effect of Leakage Flow Path Wear on Axial Thrust in Downhole Electrical Submersible Pump Unit
(The American Society of Mechanical Engineers (ASME), 2020)Subsea production fluid is quite often characterized by the presence of frac sand, which causes wear within the pump, and alters the performance envelop. One of the design parameters critically affecting reliability is the ... -
Phase-Lags' Radial Variations Between Velocity, Shear Stress, and Pressure Gradient in Ultrahigh Frequency Pulsating Turbulent Flows
(The American Society of Mechanical Engineers (ASME), 2020)Two-dimensional numerical simulations of wall-bounded turbulent pulsating flow driven by a sinusoidal velocity through a circular smooth tube are carried out. These computations for a Womersley number α ranged from 0.7 to ... -
Reviewer's Recognition
(The American Society of Mechanical Engineers (ASME), 2020)The Reviewers of the Year Award is given to reviewers who have made an outstanding contribution to the journal in terms of the quantity, quality, and turnaround time of reviews completed during the past 12 months. The prize ... -
Discussion: “Predicting the Colebrook–White Friction Factor in the Pipe Flow by New Explicit Correlations” (Azizi, N., Homayoon, R., and Hojjati, R. M., 2018, ASME J. Fluids Eng., 141(5), p. 051201)
(The American Society of Mechanical Engineers (ASME), 2020)The present comment concerns some doubtful results included in the discussed paper. [DOI: 10.1115/1.4045614]The discussed publication [1] proposes two new explicit approximations of the Colebrook–White equation (CWE) [2], ...