Journal of Fluids Engineering: Recent submissions
Now showing items 781-800 of 9024
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Optimization of Francis Turbines for Variable Speed Operation Using Surrogate Modeling Approach
(The American Society of Mechanical Engineers (ASME), 2020)Previous studies suggested variable speed operation (VSO) of Francis turbines as a measure to improve the efficiency at off-design operating conditions. This is, however, strongly dependent on the hydraulic design and, for ... -
Shock–Boundary Layer-Interaction Control Through Recirculation in a Hypersonic Inlet
(The American Society of Mechanical Engineers (ASME), 2020)This technical brief presents a flow separation mitigation device, called cavity-recirculator that can be used to control flow separation during shock wave–boundary layer interaction (SBLI) in high-speed intake flows. The ... -
Computational Study of the Effect of Homogeneous and Heterogeneous Bubbly Flows on Bulk Gas–Liquid Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2020)A numerical investigation is performed on buoyancy-driven homogeneous and heterogeneous bubbly flows to compare the bulk gas–liquid heat transfer effectiveness for Prandtl (Pr) numbers 0.2–20 and void fractions ⟨αg⟩ 0.3–0.5. ... -
Relationship Between Flow Instability and Performance of a Centrifugal Pump With a Volute
(The American Society of Mechanical Engineers (ASME), 2020)Flow instability and its correlations with performance characteristics were investigated for a centrifugal pump with a volute. Unsteady three-dimensional Reynolds-averaged Navier–Stokes analysis was performed to analyze ... -
Heaving Inverted Wing in Extreme Ground Effect
(The American Society of Mechanical Engineers (ASME), 2020)An inverted single element was subjected to a sinusoidal heaving motion in both free flight and extreme ground effect, with the ground-effect simulations oscillating in various states of interaction with the peak lift ride ... -
Investigation on the Energy Exchange Characteristics of the Regenerative Flow Pump in an Automobile Fuel System
(The American Society of Mechanical Engineers (ASME), 2020)The flow inside the regenerative flow pump (RFP) is quite complex. This study investigated four pump models with various geometrical dimensions to explore the energy exchange characteristics. A computational fluids dynamics ... -
Near- and Far-Field Acoustic Measurements for Stepped Nozzles at Over- and Perfectly-Expanded Supersonic Jet Flow Conditions
(The American Society of Mechanical Engineers (ASME), 2020)Detailed near- and far-field acoustic measurements were conducted for two circular stepped nozzles with 30 deg and 60 deg design inclinations at over- and perfectly-expanded supersonic jet flow conditions and compared to ... -
Active Control of Unsteady Cavitating Flows Over Hydrofoil
(The American Society of Mechanical Engineers (ASME), 2020)A preliminary two-dimensional (2D) numerical investigation of the active control of unsteady cavitation by means of one single synthetic jet actuator (SJA) is presented. The investigation involves the cloud-cavitating flow ... -
Droplet Coalescence in Liquid/Liquid Separation
(The American Society of Mechanical Engineers (ASME), 2020)In this paper, a new correlation is developed to predict liquid/liquid separation dynamics with a focus on a water/oil mixture. The correlation employs a force balance on the droplets to predict the rising velocity of the ... -
Direct Numerical Simulation of the Segre–Silberberg Effect Using Immersed Boundary Method
(The American Society of Mechanical Engineers (ASME), 2020)One of the fundamental phenomena associated with the transport of rigid particles by the fluid flow in narrow ducts and tubes is the Segre–Silberberg effect. Experimental observations show that a spherical particle transported ... -
Imperfect Bifurcation and Chaos of Slightly Curved Carbon Nanotube Conveying Hot Pressurized Fluid Resting on Foundations
(The American Society of Mechanical Engineers (ASME), 2020)Unintended slight curvature of a straight pipe and temperature variation in a pipe has been found to create uncertainties in tubes and pipes. Fluttering, divergence, and chaotic instabilities of slightly curved carbon ... -
Drop Generation in Cross-Flow of Liquid Rotating in Rigid Body Motion
(The American Society of Mechanical Engineers (ASME), 2020)Various methods have been developed to generate monodisperse drops of a dispersed phase (DP) liquid in an immiscible continuous phase (CP) liquid, which include the membrane emulsification method and the microfluidic drop ... -
Compressible Simulation of Flow and Sound Around a Small Axial-Flow Fan With Flow Through Casing Slits
(The American Society of Mechanical Engineers (ASME), 2020)Small axial fans are used for cooling electronic equipment and are often installed in a casing with various slits. Direct aeroacoustic simulations and experiments were performed with different casing opening ratios to ... -
Design Optimization of the Impeller and Volute of a Centrifugal Pump to Improve the Hydraulic Performance and Flow Stability
(The American Society of Mechanical Engineers (ASME), 2020)Multi-objective design optimization was applied to the impeller and volute of a centrifugal pump using surrogate-based optimization techniques and three-dimensional Reynolds-averaged Navier–Stokes (RANS) analysis. The ... -
Pilot Pipe and Damping Orifice Arrangements Analysis of a Pilot-Control Globe Valve
(The American Society of Mechanical Engineers (ASME), 2020)Compared to conventional globe valves, the pilot-control globe valve (PCGV) possesses advantages of lower energy consumption and higher space utilization. In order to analyze the effects of pilot pipe and damping orifice ... -
Dynamic Characterization of Vortex Structures and Their Evolution Mechanisms in a Side Channel Pump
(The American Society of Mechanical Engineers (ASME), 2020)To obtain a better insight into the unsteady flow behavior in side channel pumps by a robust vortex identification method, this study presents the efficacy of the new Ω-criterion in characterizing the evolution of vortex ... -
Pressure Drop of Horizontal Air–Water Slug Flow in Different Configurations of Corrugated Pipes
(The American Society of Mechanical Engineers (ASME), 2020)Corrugated pipes (CP) have regularly shaped and spaced cavities on their internal walls that can induce dynamic changes in the flow, such as increased pressure drops. Offshore petroleum production pipelines are an example ... -
Effect of Shaft Diameter on the Hydrodynamic Torque of Butterfly Valve Disk
(The American Society of Mechanical Engineers (ASME), 2020)In this study, computational fluid dynamics (cfd) software and detached eddy simulation turbulence model were used to simulate butterfly valves with different designs. The effects of shaft diameters on the value and the ... -
Magnetic–Internal–Kinetic Energy Interactions in High-Speed Turbulent Magnetohydrodynamic Jets
(The American Society of Mechanical Engineers (ASME), 2020)The goal of this study is to investigate the interactions between turbulent kinetic, internal, and magnetic energies in planar magnetohydrodynamic (MHD) jets at different regimes of Mach and Alfvén Mach numbers. Toward ... -
A Pressure Model for Open Rotor–Stator Cavities: An Application to an Adjustable-Speed Centrifugal Pump With Experimental Validation
(The American Society of Mechanical Engineers (ASME), 2020)For a centrifugal pump, the interaction between the leakage and the pressure profile in the side chambers is crucial to the performance and reliability of the pump. However, existing theoretical models for directly predicting ...