Journal of Fluids Engineering: Recent submissions
Now showing items 1301-1320 of 9024
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Improving the Film Cooling of a Rotor Blade Platform
(The American Society of Mechanical Engineers (ASME), 2018)This paper shows the results of an experimental activity developed in cooperation between Ansaldo Energia and the Department of Engineering and Applied Science of Bergamo University with the aim of assessing the impact of ... -
Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets
(The American Society of Mechanical Engineers (ASME), 2018)The entrainment, breakup, and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities. Ultra-high-speed movies were analyzed both qualitatively and quantitatively. The ... -
Experiments on the Effects of Reynolds Number and Advance Ratio on the Unfolding of Disorganization in Low-Speed Underwater Propulsors With Vibrating Blades
(The American Society of Mechanical Engineers (ASME), 2018)Ships and submarines are acoustic hazards to marine life. The rational control of acoustic radiation would be possible at least at low Reynolds numbers if the underlying organization buried in seeming randomness is revealed. ... -
Experimental Characterization of Intrinsic Properties Associated With Air-Assisted Liquid Jet and Liquid Sheet
(The American Society of Mechanical Engineers (ASME), 2018)The present study focuses on experimental characterization of interfacial instability pertinent to liquid jet and liquid sheet in the first wind-induced zone. To accomplish this objective, the interfacial wave growth rate, ... -
Linear Analysis of Converging Richtmyer–Meshkov Instability in the Presence of an Azimuthal Magnetic Field
(The American Society of Mechanical Engineers (ASME), 2018)We investigate the linear stability of both positive and negative Atwood ratio interfaces accelerated either by a fast magnetosonic or hydrodynamic shock in cylindrical geometry. For the magnetohydrodynamic (MHD) case, we ... -
Experimental Investigation of Boundary Layer Relaminarization in Accelerated Flow
(The American Society of Mechanical Engineers (ASME), 2018)Flow in turbomachines is generally highly turbulent. Nonetheless, boundary layers may exhibit laminar-to-turbulent transition, and relaminarization of the turbulent flow may also occur. The state of flow of the boundary ... -
Separation of Entrained Air Bubbles From Oil in the Intake Socket of a Pump Using Oleophilic and Oleophobic Woven and Nonwoven Fabrics
(The American Society of Mechanical Engineers (ASME), 2018)Entrained air in oil can cause malfunctions and damages within hydraulic systems. In this paper, we extend existing approaches to reduce the amount of entrained air by separating air bubbles from oil using filter elements. ... -
Numerical Study of the Winter-Kennedy Method—A Sensitivity Analysis
(The American Society of Mechanical Engineers (ASME), 2018)The Winter-Kennedy (WK) method is commonly used in relative discharge measurement and to quantify efficiency step-up in hydropower refurbishment projects. The method utilizes the differential pressure between two taps ... -
A Simple and Fast Method for Calculating Properties Across a Condensation Shock
(The American Society of Mechanical Engineers (ASME), 2018)A simple procedure for calculating the pressure at the onset and termination of condensation shocks that occur in steam nozzles and steam turbine blade passages is presented. In addition, the location of the termination ... -
An Automatic Wall Treatment for Spalart–Allmaras Turbulence Model
(The American Society of Mechanical Engineers (ASME), 2018)The Spalart–Allmaras (SA) is one of the most popular turbulence models in the aerospace computational fluid dynamics (CFD) community. In its original (low-Reynolds number) formulation, it requires a very tight grid spacing ... -
Wall Shear Stress Determination in a Small-Scale Parallel Plate Flow Chamber Using Laser Doppler Velocimetry Under Laminar, Pulsatile and Low-Reynolds Number Turbulent Flows
(The American Society of Mechanical Engineers (ASME), 2018)The parallel plate flow chamber (PPFC) has gained popularity due to its applications in fields such as biological tissue engineering. However, most of the studies using PPFC refer to theoretical relations for estimating ... -
Explanation of the Influence of Inflow Air Content on the Lift of Cavitating Hydrofoils
(The American Society of Mechanical Engineers (ASME), 2018)According to several known experiments, an increase of the incoming flow air content can increase the hydrofoil lift coefficient. The presented theoretical study shows that such increase is associated with the decrease of ... -
Lift-Generation and Moving-Wall Flow Control Over a Low Aspect Ratio Airfoil
(The American Society of Mechanical Engineers (ASME), 2018)Despite the big interest in both, micro-air vehicles (MAV) and flow-control strategies, only few studies have investigated the flow-control possibilities over low aspect ratio (LAR) wings flying at low Reynolds numbers ... -
Prediction of Cavitation Inception Within Regions of Flow Separation
(The American Society of Mechanical Engineers (ASME), 2018)Cavitation within regions of flow separation appears in drifting vortices. A two-part computational method is employed for prediction of cavitation inception number there. The first part is an analysis of the average flow ... -
Pressure-Loss Coefficient of 90 deg Sharp-Angled Miter Elbows
(The American Society of Mechanical Engineers (ASME), 2018)The pressure drop across 90deg sharp-angled miter elbows connecting straight circular pipes is studied in a bespoke experimental facility by using water and air as working fluids flowing in the range of bulk Reynolds number ... -
On Importance of the Surface Charge Transport Equation in Numerical Simulation of Drop Deformation in a Direct Current Field
(The American Society of Mechanical Engineers (ASME), 2018)In the present study, the deformation of a droplet is numerically modeled by considering the dynamic model for electric charge migration at the drop interface under the effect of a uniform electric field. The drop and its ... -
On the Development of Incompressible Round and Equilateral Triangular Jets Due to Reynolds Number Variation
(The American Society of Mechanical Engineers (ASME), 2018)The aim of this study is to examine the effects of Reynolds number (Re = 6000–20,000) on mean and turbulent quantities as well as turbulent structures in the near and intermediate regions of equilateral triangular and round ... -
Trapped Cylindrical Flow With Multiple Inlets for Savonius Vertical Axis Wind Turbines
(The American Society of Mechanical Engineers (ASME), 2018)Savonius vertical axis wind turbines (VAWTs) typically suffer from low efficiency due to detrimental drag production during one half of the rotational cycle. The present study examines a stator assembly created with the ... -
Fluid–Structure Interaction Simulation on Energy Harvesting From Vortical Flows by a Passive Heaving Foil
(The American Society of Mechanical Engineers (ASME), 2018)This study investigates energy harvesting of a two-dimensional foil in the wake downstream of a cylinder. The foil is passively mobile in the transverse direction. An immersed boundary (IB) method with a fluid–structure ... -
Comparison of Moment-Based Methods for Representing Droplet Size Distributions in Supersonic Nucleating Flows of Steam
(The American Society of Mechanical Engineers (ASME), 2018)This paper investigates the performance of moment-based methods and a monodispersed model (Mono) in predicting the droplet size distribution and behavior of wet-steam flows. The studied moment-based methods are a conventional ...