Journal of Fluids Engineering: Recent submissions
Now showing items 1461-1480 of 9024
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On the History, Science, and Technology Included in the Moody Diagram
(The American Society of Mechanical Engineers (ASME), 2017)This paper is a historical review of the science, both experimental and theoretical, behind the iconic Moody diagram used to avoid tedious iterations choosing pumps and pipes. The large body of historical pipe flow ... -
Friction Coefficients for Bingham and Power-Law Fluids in Abrupt Contractions and Expansions
(The American Society of Mechanical Engineers (ASME), 2017)Industrial processes with non-Newtonian fluids are common in many segments such as petroleum, cosmetic, and food industries. Slurries, emulsions, and gas–liquid dispersions are some examples with industrial relevance. When ... -
Mechanism of the S-Shaped Characteristics and the Runaway Instability of Pump-Turbines
(The American Society of Mechanical Engineers (ASME), 2017)Understanding the formation mechanism of the S-shaped characteristics (SSCs) and the relationship between flow structures and the runaway instability (RI) is the prerequisite for optimizing runner design to promote operational ... -
Computational and Theoretical Analyses of the Precessing Vortex Rope in a Simplified Draft Tube of a Scaled Model of a Francis Turbine
(The American Society of Mechanical Engineers (ASME), 2017)Results on flows in a draft tube of a constant-head, constant-specific speed, model Francis turbine are presented based on computational fluid dynamics (CFD) simulations and theoretical analysis. A three-dimensional, ... -
Analysis of the Vorticity in the Near Wake of a Station Wagon
(The American Society of Mechanical Engineers (ASME), 2017)A computational study of the turbulent flow around a modified station wagon vehicle is presented in order to predict aerodynamic forces and to understand some details of the near wake. The geometrical model was obtained ... -
An Experimental Investigation of the Permeability in Porous Chip Formed by Micropost Arrays Based on Microparticle Image Velocimetry and Micromanometer Measurements
(The American Society of Mechanical Engineers (ASME), 2017)Measurements of velocity and pressure differences for flows in porous chip fabricated with micropost arrays arranged in square pattern were implemented by using micro-particle image velocimetry (micro-PIV) and high precision ... -
Investigation of Vortical Structures and Turbulence Characteristics in Corner Separation in a Linear Compressor Cascade Using DDES
(The American Society of Mechanical Engineers (ASME), 2017)Three-dimensional (3D) corner separation in a linear highly loaded compressor cascade is studied by using delayed detached-eddy simulation (DDES) method. This paper studies the flow mechanism of corner separation, including ... -
Shape Optimization of the Pick-Up Tube in a Pitot-Tube Jet Pump
(The American Society of Mechanical Engineers (ASME), 2017)At a very low specific speed (VLSS), pumps normally suffer from high disk friction losses. In order to solve this issue, it can be helpful to use a different centrifugal pump design, which is not often found in the pump ... -
Features of a Laminar Separated Boundary Layer Near the Leading-Edge of a Model Airfoil for Different Angles of Attack: An Experimental Study
(The American Society of Mechanical Engineers (ASME), 2017)The evolution of a separated boundary layer over a model airfoil with semicircular leading-edge has been illustrated for angles of attack (α) varying from −3 deg to 10 deg, where the Reynolds number (Rec) based on chord ... -
Miniature Viscous Disk Pump: Performance Variations From Non-Newtonian Elastic Turbulence
(The American Society of Mechanical Engineers (ASME), 2017)Within the present investigation, a miniature viscous disk pump (VDP) is utilized to characterize and quantify non-Newtonian fluid elastic turbulence effects, relative to Newtonian flow behavior. Such deviations from ... -
Analysis of the Leakage Behavior of Francis Turbines and Its Impact on the Hydraulic Efficiency—A Validation of an Analytical Model Based on Computational Fluid Dynamics Results
(The American Society of Mechanical Engineers (ASME), 2017)The present contribution addresses the analysis of the leakage behavior of a small hydro Francis turbine using an analytical approach, which was validated based on the results of computational fluid dynamics (CFD). For a ... -
New Two-Fluid Model Near-Wall Averaging and Consistent Matching for Turbulent Bubbly Flows
(The American Society of Mechanical Engineers (ASME), 2017)A new two-fluid model averaging in the near-wall region is proposed to ensure consistent matching of the two-phase k–ε turbulence model with the two-phase logarithmic law of the wall (Marie J. L., Moursali, E., and Tran-Cong, ... -
Two-Dimensional Experimental Investigation on the Effects of a Fowler Flap Gap and Overlap Size on the Wake Flow Field
(The American Society of Mechanical Engineers (ASME), 2017)This work details an experimental investigation on the effects of the variation of flap gap and overlap sizes on the flow field in the wake of a wing-section equipped with a trailing edge Fowler flap. The airfoil was based ... -
Turbulence Modeling of Cavitating Flows in Liquid Rocket Turbopumps
(The American Society of Mechanical Engineers (ASME), 2017)An accurate prediction of the performance characteristics of cavitating cryogenic turbopump inducers is essential for an increased reliance on numerical simulations in the early turbopump design stages of liquid rocket ... -
Morphing Continuum Theory: Incorporating the Physics of Microstructures to Capture the Transition to Turbulence Within a Boundary Layer
(The American Society of Mechanical Engineers (ASME), 2017)A boundary layer with Re = 106 is simulated numerically on a flat plate using morphing continuum theory. This theory introduces new terms related to microproperties of the fluid. These terms are added to a finite-volume ... -
Cavitation-Induced Unsteady Flow Characteristics in the First Stage of a Centrifugal Charging Pump
(The American Society of Mechanical Engineers (ASME), 2017)Cavitation is the main factor that causes reliability problems in centrifugal charging pumps (CCPs) in nuclear power plants. In this study, the cavitation-induced unsteady flow characteristics of a CPR1000 CCP were ... -
Propagation and Attenuation of Pressure Waves in Dispersed Two-Phase Flows
(The American Society of Mechanical Engineers (ASME), 2017)The propagation and attenuation of pressure waves in highly dispersed gas–liquid flows are investigated in this work, and an indirect measurement method is proposed to assess the attenuation coefficient in short pipelines. ... -
Ferrofluid Capillary Rise in Porous Medium Under the Action of Nonuniform Magnetic Field
(The American Society of Mechanical Engineers (ASME), 2017)The capillary flow of a ferrofluid in a single cylindrical capillary tube and through a sandy porous medium under the action of a nonuniform magnetic field is studied experimentally. The dynamics of the capillary rise and ... -
Modeling of Hydrophobic Surfaces by the Stokes Problem With the Stick–Slip Boundary Conditions
(The American Society of Mechanical Engineers (ASME), 2017)Unlike the Navier boundary condition, this paper deals with the case when the slip of a fluid along the wall may occur only when the shear stress attains certain bound which is given a priori and does not depend on the ... -
Instability of a Curved Pipe Flow With a Sudden Expansion
(The American Society of Mechanical Engineers (ASME), 2017)Numerical calculations of laminar flow of an incompressible fluid through an axisymmetric sudden expansion followed by a curved pipe recently done by the authors discovered an early instability of this flow for a certain ...