Journal of Fluids Engineering: Recent submissions
Now showing items 2221-2240 of 9024
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On the Anisotropic Vorticity in Turbulent Channel Flows
(The American Society of Mechanical Engineers (ASME), 2015)Revisiting the fluctuating vorticity field in the centerplane of a turbulent channel flow, we show that the vorticity is distinctly anisotropic at low Reynolds numbers (Re). This result is in contrast with some earlier ... -
Numerical Investigation on Frequency Jump of Flow Over a Cavity Using Large Eddy Simulation
(The American Society of Mechanical Engineers (ASME), 2015)Large eddy simulation (LES) approach was used to investigate jumps of primary frequency of shear layer flow over a cavity. Comparisons between computational results and experimental data show that LES is an appropriate ... -
Experimental and Numerical Aerodynamic Analysis of a Passenger Car: Influence of the Blockage Ratio on Drag Coefficient
(The American Society of Mechanical Engineers (ASME), 2015)Experimental and numerical investigations were performed to determine the pressure distributions and the drag forces on a passenger car model. Experiments were carried out with 1/5th scale model FIAT Linea for 20% and ~ ... -
An Experimental Determination of the Viscosity of Propylene Glycol/Water Based Nanofluids and Development of New Correlations
(The American Society of Mechanical Engineers (ASME), 2015)Measurements have been carried out for determining the viscosity of several nanofluids, in which different nanoparticles were dispersed in a base fluid of 60% propylene glycol (PG) and 40% water by mass. The nanoparticles ... -
Effects of Convection on Isotachophoresis of Electrolytes
(The American Society of Mechanical Engineers (ASME), 2015)In this study, the form of the analytes distribution in isotachophoresis (ITP) in the presence of a convective flow is analyzed in a wide rectangular microchannel. The imposed convection is considered due to a mismatch of ... -
Flow Simulation of Jet Deviation by Rotating Pelton Buckets Using Finite Volume Particle Method
(The American Society of Mechanical Engineers (ASME), 2015)The objective of the present paper is to perform numerical simulations of a highspeed water jet impinging on rotating Pelton buckets using the finite volume particle method (FVPM), which combines attractive features of ... -
Lift and Drag Characteristics of an Air Cooled Heat Exchanger Axial Flow Fan
(The American Society of Mechanical Engineers (ASME), 2015)Actuatordisk models (ADMs) use blade element theory to numerically simulate the flow field induced by axial fans. These models give a fair approximation at near design flow rates, but are of poor accuracy at low flow rates. ... -
An Evaluation Approach for the Stall Margin Enhancement With Stall Precursor Suppressed Casing Treatment
(The American Society of Mechanical Engineers (ASME), 2015)It is known that a kind of stall precursorsuppressed (SPS) casing treatment can be used to enhance compressor stall margin (SM) without recognizable efficiency loss. The further requirement in this regard is to develop an ... -
Influences of the Operating Conditions on the Rotordynamic Forces Acting on a Three Bladed Inducer Under Forced Whirl Motion
(The American Society of Mechanical Engineers (ASME), 2015)In the present paper, the results from an extensive experimental characterization of the rotordynamic forces acting on a whirling threebladed, taperedhub, variablepitch inducer are presented. The campaign has been conducted ... -
Experimental Investigation of Drag Reducing Fluid Flow in Annular Geometry Using Particle Image Velocimetry Technique
(The American Society of Mechanical Engineers (ASME), 2015)Fully developed turbulent flow of drag reducing fluids through a horizontal flow loop with concentric annular geometry was investigated using the particle image velocimetry (PIV) technique. Experiments were conducted at ... -
Validation of Particle Laden Turbulent Flow Simulations Including Turbulence Modulation
(The American Society of Mechanical Engineers (ASME), 2015)The objective of the present numerical study is the validation of wallbounded, turbulent particleladen air flow simulations for a wide range of flow and particle parameters (i.e., flow and particle Reynolds numbers, Stokes ... -
Skin Friction Fields and Surface Dye Patterns on Delta Wings in Water Flows
(The American Society of Mechanical Engineers (ASME), 2015)This paper discusses the relationship between skin friction fields and surface dye patterns in surface luminescent dye visualizations in water flows, providing a theoretical foundation for extraction of highresolution skin ... -
Concurrent Droplet Coalescence and Solidification on Surfaces With Various Wettabilities
(The American Society of Mechanical Engineers (ASME), 2015)An experimental study is performed to analyze the shear driven droplet shedding on cold substrates with different airflow speeds typical of those in the flight conditions. Understanding the mechanism of simultaneous droplet ... -
Measurements of Loading and Tip Vortex Due to High Reynolds Number Flow Over a Rigid Lifting Surface
(The American Society of Mechanical Engineers (ASME), 2015)An experimental study of highReynolds number flow over a rigid hydrofoil (David Taylor model basin (DTMB) modified NACA66009, rectangular planform, aspect ratio (AR = 4, square tip) is presented. The measurements were ... -
Numerical Optimization of the Inlet Velocity Profile Ingested by the Conical Draft Tube of a Hydraulic Turbine
(The American Society of Mechanical Engineers (ASME), 2015)Past numerical and experimental research has shown that the draft tube inlet velocity is critically important to hydropower plant performance, especially in the case of lowhead installations. However, less is known about ... -
Numerical Analysis of Flow Over the NASA Common Research Model Using the Academic Computational Fluid Dynamics Code Galatea
(The American Society of Mechanical Engineers (ASME), 2015)A recently developed academic computational fluid dynamics (CFD) code, named Galatea, is used for the computational study of fully turbulent flow over the NASA common research model (CRM) in a wingbody configuration with ... -
Slipping of a Viscoplastic Fluid Flowing on a Circular Cylinder
(The American Society of Mechanical Engineers (ASME), 2015)The slipping effect during creeping flow of viscoplastic fluids around a circular cylinder has been investigated via numerical simulations. For the bulk behavior of the fluid, a Herschel–Bulkley law is considered. For ... -
Effect of Axial Clearance on the Efficiency of a Shrouded Centrifugal Pump
(The American Society of Mechanical Engineers (ASME), 2015)Clearance always exists between the rotating impeller shrouds and the stationary casing covers in shrouded centrifugal pumps, which affects the pump internal flow and performance. Model tests were conducted for a shrouded ... -
Three Dimensional Flow in a Driven Cavity Subjected to an External Magnetic Field
(The American Society of Mechanical Engineers (ASME), 2015)In this paper, we study the threedimensional (3D) flow of an electrically conducting fluid in a cubic cavity with the top wall moving and subjected to an external magnetic field. The governing flow and electromagnetic field ... -
Optimization Using Arbitrary Lagrangian–Eulerian Formulation of the Navier–Stokes Equations
(The American Society of Mechanical Engineers (ASME), 2015)In this paper, we present a new shape optimization method by using sensitivities obtained from the Arbitrary Lagrangian–Eulerian (ALE) form of the Navier–Stokes equations. In the ALE description, the nodes of the ...