Journal of Fluids Engineering: Recent submissions
Now showing items 1381-1400 of 9024
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Proper Orthogonal Decomposition of Self-Induced Instabilities in Decelerated Swirling Flows and Their Mitigation Through Axial Water Injection
(The American Society of Mechanical Engineers (ASME), 2017)The swirling flow exiting the runner of a hydraulic turbine is further decelerated in the discharge cone of the draft tube to convert the excess of dynamic pressure into static pressure. When the turbine is operated far ... -
Experimental and Numerical Investigations on Withdrawal of Water-Capped Viscoplastic Fluid
(The American Society of Mechanical Engineers (ASME), 2017)Withdrawal of water-capped viscoplastic fluid was investigated using laboratory experimentation and numerical modeling. The viscoplastic fluid was modeled using a Laponite suspension, which was withdrawn by a vertical pipe ... -
New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2017)This paper deals with rotating effects simulation of steady flows in turbomachinery. To take into account the rotating nature of the flow, the frozen rotor approach is one of the widely used approaches. This technique, ... -
Laminar, Radial Flow of Two Immiscible Fluids in Slender Wedge-Shaped Passages
(The American Society of Mechanical Engineers (ASME), 2017)The Jeffery–Hamel problem for laminar, radial flow between two nonparallel plates has been extended to the case of two immiscible fluids in slender channels. The governing continuity and momentum equations were solved ... -
Enhanced Electroosmotic Flow Through a Nanochannel Patterned With Transverse Periodic Grooves
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, we have analyzed an enhanced electroosmotic flow (EOF) by geometric modulation of the surface of a charged nanochannel. Otherwise, flat walls of the channel are modulated by embedding rectangular grooves ... -
Rough Surface Wall Function Treatment With Single Equation Turbulence Models
(The American Society of Mechanical Engineers (ASME), 2017)Most literature in the area of turbulent flow over rough surfaces discusses methods for turbulence models based on two or more transport equations, one of which is that for turbulence kinetic energy which supplies k that ... -
Study of Pressure Shock Caused by a Vortex Ring Separated From a Vortex Rope in a Draft Tube Model
(The American Society of Mechanical Engineers (ASME), 2017)Operating hydraulic turbines under part- or over-load conditions leads to the development of the precessing vortex rope downstream of the turbine runner. In a regime close to the best efficiency point (BEP), the vortex ... -
Clarifying the Physics of Flow Separations in Steam Turbine Inlet Valves at Part Load Operation and Improved Design Considerations
(The American Society of Mechanical Engineers (ASME), 2017)In steam turbine inlet valves used to adjust the power output of large steam turbines, the through-flow is reduced by lowering the valve plug and hence reducing the cross-sectional area between the plug and the seat. At ... -
Analysis of Flow Past Oscillatory Cylinders Using a Finite Element Fixed Mesh Formulation
(The American Society of Mechanical Engineers (ASME), 2017)In this work, we propose a fixed mesh finite element formulation to solve the fluid dynamic on an Eulerian mesh dealing with immersed bodies in motion. The study is focused on the computation of the fluid dynamic forces ... -
Evaporation Effects in Shock-Driven Multiphase Instabilities
(The American Society of Mechanical Engineers (ASME), 2017)This paper considers the effects of multiphase parameters on a shock-driven particle-laden hydrodynamic instability using simulations performed with the hydrocode FLAG, developed at Los Alamos National Laboratory. The ... -
Experimental Study and Computational Fluid Dynamics Modeling of Pulp Suspensions Flow in a Pipe
(The American Society of Mechanical Engineers (ASME), 2017)Eucalyptus and Pine suspensions flow in a pipe was studied experimentally and numerically. Pressure drop was measured for different mean inlet flow velocities. Electrical impedance tomography (EIT), was used to evaluate ... -
Transient Growth and Receptivity of Steady Disturbances to Irregular Rough Walls
(The American Society of Mechanical Engineers (ASME), 2017)Direct numerical simulations (DNS) are performed to investigate the transient growth of a steady disturbance induced by a numerically generated Gaussian rough wall in a laminar boundary layer. In the calculation of the ... -
Modeling and Experimental Investigation of Bubble Formation in Shear-Thinning Liquids
(The American Society of Mechanical Engineers (ASME), 2017)This investigation presents both theoretical and experimental studies on the size of a growing bubble in power-law non-Newtonian liquids. At first, some previous works on the prediction of bubble size in Newtonian liquids ... -
Influence of Morphology on Flow Law Characteristics in Open-Cell Foams: An Overview of Usual Approaches and Correlations
(The American Society of Mechanical Engineers (ASME), 2017)Foam structures have been a subject of intensive research since the last decade. The pore space in open-cell foam is interconnected, forming perforated channels of varying cross-sectional areas where fluid can flow. Knowledge ... -
Spray Characteristics of Elliptical Power-Law Fluid-Impinging Jets
(The American Society of Mechanical Engineers (ASME), 2017)The spray characteristics of a liquid sheet contribute much to the investigation of atomization efficiency. Considering the jet contracting effect of elliptical jets, an improved model of elliptical power-law fluid jets ... -
Experimental Study of Load Variations on Pressure Fluctuations in a Prototype Reversible Pump Turbine in Generating Mode
(The American Society of Mechanical Engineers (ASME), 2017)The characteristics of pressure fluctuations in a prototype reversible pump turbine (RPT) is investigated within a wide range of load conditions with a focus on the low-load condition (e.g., 25% of rated power) with the ... -
The Topology of a Precessing Flow Within a Suddenly Expanding Axisymmetric Chamber
(The American Society of Mechanical Engineers (ASME), 2017)A comprehensive study on the flow structure of an ensemble-averaged fluidic precessing jet (FPJ) flow is reported. This study is based on the concepts of critical point theory, previous experimental data, and validated ... -
On the Measurement and Modeling of High-Pressure Flows in Poppet Valves Under Steady-State and Transient Conditions
(The American Society of Mechanical Engineers (ASME), 2017)Flow coefficients of intake valves and port combinations were determined experimentally for a compressed nitrogen engine under steady-state and dynamic flow conditions for inlet pressures up to 3.2 MPa. Variable valve ... -
Instantaneous Wind-Tunnel Model Vibration Measurements Using a Kalman Filtering Approach
(The American Society of Mechanical Engineers (ASME), 2017)Experiments in ground-test facilities are required to develop and mature aero-optic platforms. However, structural vibrations of the facility can introduce significant error in optical experiments, making it difficult to ... -
Unsteady Pressure Pulsation Measurements and Analysis of a Low Specific Speed Centrifugal Pump
(The American Society of Mechanical Engineers (ASME), 2017)Intense pressure pulsation, resulted from the flow structure shedding from the blade trailing edge and its interaction with the volute tongue and the casing, is detrimental to the stable operation of centrifugal pumps. In ...