Journal of Fluids Engineering: Recent submissions
Now showing items 981-1000 of 9024
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Constant-Speed Oscillation of a Pump Turbine Observed on a Pumped-Storage Model System
(American Society of Mechanical Engineers (ASME), 2019)The hydraulic characteristics of pump turbines in off-design conditions, especially the S-shaped characteristics, are crucial for the safety and stability of the unit. To explore the S-characteristics of pump turbines ... -
Spatial–Temporal Evolution of Tip Leakage Vortex in a Mixed-Flow Pump With Tip Clearance
(American Society of Mechanical Engineers (ASME), 2019)Tip clearance in pump induces tip leakage vortex (TLV), which interacts with the main flow and leads to instability of flow pattern and decrease of pump performance. In this work, the characteristics of TLV in a mixed-flow ... -
Experimental Study of Transient Squeezing Film Flow
(American Society of Mechanical Engineers (ASME), 2019)In this paper, we report an experimental approach to examine a fast-developing flow in a thin fluid gap. The phenomenon is widely observed in industrial applications, e.g., squeeze dampers, and in biological systems, e.g., ... -
Numerical Investigation of Added Mass and Hydrodynamic Damping on a Blunt Trailing Edge Hydrofoil
(American Society of Mechanical Engineers (ASME), 2019)Added mass and hydrodynamic damping play significant roles in fluid-structure interaction (FSI) in hydraulic turbines. Added mass can reduce natural frequencies, while hydrodynamic damping could result in a higher amplitude ... -
Gas-Induced Motion of a Piston in a Vibrated Liquid-Filled Housing
(American Society of Mechanical Engineers (ASME), 2019)Models and experiments are developed to investigate how a small amount of gas can cause large rectified motion of a piston in a vibrated liquid-filled housing when piston drag depends on piston position so that damping is ... -
Parametric Study of the Frequency of Bubble Formation at a Single Orifice With Liquid Cross-Flow
(American Society of Mechanical Engineers (ASME), 2019)The bubble formation frequency from a single-orifice nozzle subjected to the effects of a crossflowing liquid was investigated using high-speed shadowgraphy, combined with image analysis and signal processing techniques. ... -
Characteristics of the Flow Past a Wall-Mounted Finite-Length Square Cylinder at Low Reynolds Number With Varying Boundary Layer Thickness
(American Society of Mechanical Engineers (ASME), 2019)Direct numerical simulation (DNS) is performed to investigate the modes of shedding of the wake of a wall-mounted finite-length square cylinder with an aspect ratio (AR) of 7 for six different boundary layer thicknesses ... -
Calibration Zone for the Parameters of the Differential Evolution Algorithm and Its Application to a Real Burst Location Problem
(American Society of Mechanical Engineers (ASME), 2019)Numerical problems are usually solved using heuristic algorithms, due to their simplicity and easy understanding. Nevertheless, most of these methods have calibration parameters that do not count with selection premises ... -
Development of Venturi-Tube With Spiral-Shaped Fin for Water Treatment
(American Society of Mechanical Engineers (ASME), 2019)Detailed numerical data were presented for the development of a venturi-type water purifier which had a cavitation nozzle to enhance turbulent kinetic energy and vapor volume fraction. Numerical analysis for cavitation was ... -
Assessment of Computational Fluid Dynamics Capabilities for the Prediction of Three-Dimensional Separated Flows: The DELFT 372 Catamaran in Static Drift Conditions
(American Society of Mechanical Engineers (ASME), 2019)In this paper, capabilities of state-of-the-art computational fluid dynamics (CFD) tools in the prediction of the flow-field around a multihull catamaran advancing in straight ahead motion at nonzero drift angles are ... -
Assessment of the Reliability of Two-Equation URANS Models in Predicting a Precessing Flow
(American Society of Mechanical Engineers (ASME), 2019)A systematic assessment of unsteady Reynolds-averaged Navier–Stokes (URANS) models in predicting the complex flow through a suddenly expanding axisymmetric chamber is reported. Five types of URANS models assessed in the ... -
Analytical and Numerical Study of a Pulsatile Flow in a Porous Tube
(American Society of Mechanical Engineers (ASME), 2019)Lateral leakage is encountered in many biological and chemical applications such as renal flows and filtration processes. In this paper, we report a comprehensive analytical and numerical method to examine pulsatile flow ... -
Simulation of Intermittent Flow Development in a Horizontal Pipe
(American Society of Mechanical Engineers (ASME), 2019)In this study, detailed three-dimensional (3D) numerical simulations of intermittent multiphase flows were carried out to investigate the slug initiation process and various features of intermittent flows inside a horizontal ... -
Mechanism of Fast Transition of Pressure Pulsations in the Vaneless Space of a Model Pump-Turbine During Runaway
(American Society of Mechanical Engineers (ASME), 2019)The pressure pulsations in the vaneless space of pump-turbines are extremely intense and always experience rapid time variations during transient scenarios, causing structural vibrations and even more serious accidents. ... -
Preliminary Development of a Measurement Reference Using a Research Simplex Atomizer
(American Society of Mechanical Engineers (ASME), 2019)Cold-flow spray researchers have an array of diagnostic tools to extract meaningful information on spray characteristics. The efficacy of many of these tools, however, depends heavily on calibration, alignment, human ... -
The M Number: A Novel Parameter to Evaluate the Performance of Static Mixers
(American Society of Mechanical Engineers (ASME), 2019)Static mixers (SM) have become standard equipment in the process industries. They are widely used in applications that involve chemical reactions, heat transfer, blending of fluids, or a combination of these. Compared to ... -
A Computational Fluid Dynamics Methodology for Predicting Aeration in Wet Friction Clutches
(American Society of Mechanical Engineers (ASME), 2019)Computational fluid dynamics (CFD) has been unable to reliably predict aeration and drag torque in clutches. In this study, a CFD method was developed to reliably predict the onset of aeration and drag torque as a function ... -
Entry Length Requirements for Two- and Three-Dimensional Laminar Couette–Poiseuille Flows
(American Society of Mechanical Engineers (ASME), 2019)In this study, we examine the development length requirements for laminar Couette–Poiseuille flows in a two-dimensional (2D) channel as well as in the three-dimensional (3D) case of flow through a square duct, using a ... -
Physical Mechanism of Interblade Vortex Development at Deep Part Load Operation of a Francis Turbine
(American Society of Mechanical Engineers (ASME), 2019)For seamless integration of growing electricity production from intermittent renewable energy sources, Francis turbines are under increasing demand to extend their operating range. This requires Francis turbines to operate ... -
Modeling Gas–Liquid Flow Between Rotating and Nonrotating Annular Disks
(American Society of Mechanical Engineers (ASME), 2019)When a liquid is forced to flow radially outward in the gap between two coaxial, parallel annular disks—one rotating and one stationary—the liquid occupies the entire gap until the speed of the rotating disk reaches a ...