Journal of Fluids Engineering: Recent submissions
Now showing items 2241-2260 of 9024
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Fluid Stiction Modeling for Quickly Separating Plates Considering the Liquid Tensile Strength
(The American Society of Mechanical Engineers (ASME), 2015)Fluid stiction may significantly influence the dynamic behavior when attempting to quickly separate two plates in close contact. The liquid fluid film, filling the gap between the plates, experiences a pressure drop resulting ... -
The Effect of Initial Momentum Flux on the Circular Hydraulic Jump
(The American Society of Mechanical Engineers (ASME), 2015)Earlier studies on the circular hydraulic jump have shown that the radial position of the hydraulic jump depends on the flow rate, gravity, and fluid viscosity. In this study, results from numerical simulations and experiments ... -
Comparison of Experimental and RANS Based Numerical Studies of the Decay of Grid Generated Turbulence
(The American Society of Mechanical Engineers (ASME), 2015)This paper presents both experimental and numerical studies of the statistical properties of turbulent flows at moderate Reynolds number (Reخ»â€‰= 100) in the context of gridgenerated turbulence. In spite of the popularity ... -
The Effect of Streamtube Contraction on the Characteristics of a Streamwise Vortex
(The American Society of Mechanical Engineers (ASME), 2015)The ingestion of a vortex by an aeroengine is potentially an area of concern for current and future aircraftengine configurations. However, there are very little experimental data on the characteristics of a streamwise ... -
Measurement of Fluid Flow Thickness Within a Rotating Cone
(The American Society of Mechanical Engineers (ASME), 2015)This paper reports experimental measurements of film thickness for continuous fluid flow on the internal surface of a cone rotating about a vertical axis. Measurements were obtained via an optical method based on photographing ... -
Experimental Investigation of a High Head Francis Turbine During Spin No Load Operation
(The American Society of Mechanical Engineers (ASME), 2015)Water passes freely through a hydraulic turbine in the absence of power requirements or during maintenance of the transmission lines, spillways, or dam. Moreover, the turbine operates under noload conditions prior to ... -
The Flow Behavior of a Biofluid in a Separated and Reattached Flow Region
(The American Society of Mechanical Engineers (ASME), 2015)The flow behavior of human blood in a separated and reattached flow region is investigated. Hemorheological data that account for the yield stress and shearthinning nonNewtonian characteristics of blood are used. The ... -
Influence of Vegetation on Turbulence Characteristics and Reynolds Shear Stress in Partly Vegetated Channel
(The American Society of Mechanical Engineers (ASME), 2015)From the perspective of vegetation density, this research studies the influence of vegetation on turbulence characteristics and Reynolds shear stress in partly vegetated channel via a series of experiments. Natural reed ... -
An Experimental Study of the Flow Field Inside the Diffuser Passage of a Laboratory Centrifugal Pump
(The American Society of Mechanical Engineers (ASME), 2015)Measurements are processed on a centrifugal pump model, which works with air and performs with the vaneisland type diffuser of a real hydraulic pump, under five flow rates to investigate the internal flow characteristics ... -
Experimental Investigation on Unsteady Pressure Pulsation in a Centrifugal Pump With Special Slope Volute
(The American Society of Mechanical Engineers (ASME), 2015)Rotor–stator interaction, a major source of high amplitude pressure pulsation and flowinduced vibration in the centrifugal pump, is detrimental to stable operation of pumps. In the present study, a slope volute is ... -
Runaway Instability of Pump Turbines in S Shaped Regions Considering Water Compressibility
(The American Society of Mechanical Engineers (ASME), 2015)Pumpturbine characteristics greatly affect the operational stability of pumpedstorage plants. In particular, the Sshaped region of the characteristic curves leads to severe instability during runaway conditions with ... -
Control of Wake Structure Behind a Square Cylinder by Magnetohydrodynamics
(The American Society of Mechanical Engineers (ASME), 2015)In this paper, a twodimensional (2D) numerical simulation has been performed for an unsteady magnetohydrodynamics (MHD) flow around a solid square cylinder placed in a channel. Computational simulations were done for the ... -
Unsteady Numerical Simulation of Flow in Draft Tube of a Hydroturbine Operating Under Various Conditions Using a Partially Averaged Navier–Stokes Model
(The American Society of Mechanical Engineers (ASME), 2015)The variable energy demand requires a great flexibility in operating a hydroturbine, which forces the machine to be operated far from its design point. One of the main components of a hydroturbine where undesirable flow ... -
Alternative Approach to Convolution Term of Viscoelasticity in Equations of Unsteady Pipe Flow
(The American Society of Mechanical Engineers (ASME), 2015)In the paper, the selected aspects concerning description of viscoelastic behavior of pipe walls during unsteady flow are analyzed. The alternative convolution expression of the viscoelastic term is presented and compared ... -
Combined Numerical and Experimental Investigation of the Cavitation Erosion Process
(The American Society of Mechanical Engineers (ASME), 2015)We are comparing results of numerical simulations against highspeed simultaneous observations of cavitation and cavitation erosion. We performed fully compressible, cavitating flow simulations to resolve the formation of ... -
Effect of Three Dimensional Surface Topography on Gas Flow in Rough Micronozzles
(The American Society of Mechanical Engineers (ASME), 2015)The gas flow characteristics in rectangular cross section converging–diverging micronozzles incorporating the effect of threedimensional (3D) rough surface topography are investigated. The fractal geometry is utilized ... -
Study on the Effect of Inlet Fluctuation on Cavitation in a Cone Flow Channel
(The American Society of Mechanical Engineers (ASME), 2015)A mathematical method was conducted to investigate the mechanism of formation of cavitation cloud, while the inlet stream contains a fluctuating flow. Based on the Rayleigh–Plesset equation and the static pressure ... -
Unsteady Structure and Development of a Row of Impingement Jets, Including Kelvin–Helmholtz Vortex Development
(The American Society of Mechanical Engineers (ASME), 2015)Considered is a cylinder channel with a single row of ten aligned impinging jets, with exit flow in the axial direction at one end of the channel. For the present predictions, an unsteady ReynoldsAveraged Navier–Stokes ... -
Interactions of Vortices of a Square Cylinder and a Rectangular Vortex Generator Under Couette–Poiseuille Flow
(The American Society of Mechanical Engineers (ASME), 2015)This study focuses on interactions of vortices generated by a family of eddypromoting upstream rectangular cylinders (of different heights a* and widths b*) with the shear layers of a downstream square cylinder (of height ... -
Experimental Characterization of a Pump–Turbine in Pump Mode at Hump Instability Region
(The American Society of Mechanical Engineers (ASME), 2015)The unsteady phenomena of a low specific speed pump–turbine operating in pump mode were characterized by dynamic pressure measurements and highspeed flow visualization of injected air bubbles. Analyses were carried out ...