Journal of Fluids Engineering: Recent submissions
Now showing items 1041-1060 of 9024
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Experimental Study of Transient Squeezing Film Flow
(The 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., ... -
Mixed Convective Flow of Electrically Conducting Fluid in a Vertical Cylindrical Annulus With Moving Walls Adjacent to a Radial Magnetic Field Along With Transpiration
(The American Society of Mechanical Engineers (ASME), 2019)The steady, viscous flow and mixed convection heat transfer of an incompressible electrically conducting fluid within a vertical cylindrical annulus with moving walls are investigated. This annulus is under the influence ... -
Calculation of Stall Margin Enhancement With Micro-Tip Injection in an Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2019)Although steady micro-injection is experimentally validated as an attractive method in improving the stall margin of axial compressors, up to now a fast prediction of stall boundary remains some way off. This investigation ... -
Numerical Investigation of Added Mass and Hydrodynamic Damping on a Blunt Trailing Edge Hydrofoil
(The 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 ... -
Investigation of the Pressure Drop Across Packed Beds of Spherical Beads: Comparison of Empirical Models With Pore-Level Computational Fluid Dynamics Simulations
(The American Society of Mechanical Engineers (ASME), 2019)This study uses novel methods, combining discrete element method (DEM) simulations for packing and computational fluid dynamics (CFD) modeling of fluid flow, to simulate the pressure drop across rigid, randomly packed beds ... -
Application of an Intermittency Model for Laminar, Transitional, and Turbulent Internal Flows
(The American Society of Mechanical Engineers (ASME), 2019)A turbulent transition model has been applied to fluid flow problems that can be laminar, turbulent, transitional, or any combination. The model is based on a single additional transport equation for turbulence intermittency. ... -
Calculation of Friction Factors and Nusselt Numbers for Twisted Elliptical Tube Heat Exchangers Using Nek5000
(The American Society of Mechanical Engineers (ASME), 2019)Twisted elliptical tube geometries for heat exchanger design are expected to offer significant enhancement in heat transfer with a marginal increase in frictional losses. The presented work focuses on computational fluid ... -
Assessment of the Reliability of Two-Equation URANS Models in Predicting a Precessing Flow
(The 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 ... -
Numerical Simulation of Drag Reduction in Microgrooved Substrates Using Lattice-Boltzmann Method
(The American Society of Mechanical Engineers (ASME), 2019)We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of ... -
A Transient Computational Fluid Dynamics, Phase Modulated, Multifrequency Approach for Impeller Rotordynamic Forces
(The American Society of Mechanical Engineers (ASME), 2019)Modern high performance turbomachines frequently operate in supercritical condition above their first critical speed, rendering these machines prone to rotordynamic instability. The American Petroleum Institute (API) ... -
Experimental Quantification of Vent Mechanism Flow Parameters in 18650 Format Lithium Ion Batteries
(The American Society of Mechanical Engineers (ASME), 2019)Lithium ion batteries have a well-documented tendency to fail energetically under various abuse conditions. These conditions frequently result in decomposition of the electrochemical components within the battery resulting ... -
Multi-Objective Shape Optimization on the Inlet Pipe of a Vertical Inline Pump
(The American Society of Mechanical Engineers (ASME), 2019)Vertical inline pump is a single-stage single-suction centrifugal pump with a bent pipe before the impeller, which is usually used where installation space is a constraint. In this paper, with three objective functions of ... -
Evaluation of Cavitation Erosion Intensity in a Microscale Nozzle Using Eulerian–Lagrangian Bubble Dynamic Simulation
(The American Society of Mechanical Engineers (ASME), 2019)In the present study, cavitation erosion is investigated by implementing an Eulerian–Lagrangian approach. Three-dimensional two-phase flow is simulated in a microscale nozzle using Reynolds-averaged Navier–Stokes (RANS) ... -
Characteristics of the Flow Past a Wall-Mounted Finite-Length Square Cylinder at Low Reynolds Number With Varying Boundary Layer Thickness
(The 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 ... -
Constant-Speed Oscillation of a Pump Turbine Observed on a Pumped-Storage Model System
(The 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 ... -
Calibration Zone for the Parameters of the Differential Evolution Algorithm and Its Application to a Real Burst Location Problem
(The 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
(The 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 ... -
Measurement of Transitional Surface Roughness Effects on Flat-Plate Boundary Layer Transition
(The American Society of Mechanical Engineers (ASME), 2019)An experimental study has been conducted to investigate the effects of transitionally rough surface on the flat-plate boundary layer transition. Transitional boundary layers with three different flat plates (ks+ = 0.07 ∼ 0.19, ... -
Time Domain Simulation of Lifting Bodies Acting at or Near the Free Surface With Vortex Particle Wakes
(The American Society of Mechanical Engineers (ASME), 2019)Boundary element method (BEM) potential-flow solvers are regularly used in industrial applications due to their quick setup and computational time. In aerodynamics, vortex particle methods (VPM) are widely used with BEM ... -
Numerical Investigation of the Effects of Nonsinusoidal Motion Trajectory on the Propulsion Mechanisms of a Flapping Airfoil
(The American Society of Mechanical Engineers (ASME), 2019)The effect of nonsinusoidal trajectory on the propulsive performances and the vortex shedding process behind a flapping airfoil is investigated in this study. A movement of a rigid NACA0012 airfoil undergoing a combined ...