Solidification and Melting of Aluminum onto Circular Cylinders Under Forced Convection: Experimental Measurements and Numerical Modeling

2014 ◽  
Vol 45 (5) ◽  
pp. 1723-1738 ◽  
Author(s):  
Mitren Sukhram ◽  
Stavros A. Argyropoulos
Keyword(s):  
Numerical Modeling ◽  
Forced Convection ◽  
Circular Cylinders ◽  
Experimental Measurements

scholarly journals Numerical study of forced convection heat transfer over three cylinders in staggered arrangement immersed in porous media

2018 ◽  
Vol 22 (1 Part B) ◽  
pp. 467-475 ◽  
Author(s):  
Habib-Olah Sayehvand ◽  
Sakene Yari ◽  
Parsa Basiri
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Forced Convection ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Circular Cylinders ◽  
Convection Heat ◽  
State Equations ◽  
Forced Convection Heat Transfer ◽  
Staggered Arrangement

Staggered arrangement is one of the common configurations in heat exchangers that make better mixing of flow and heat transfer augmentation than other arrangements. In this paper forced convection heat transfer over three isothermal circular cylinders in staggered configuration in isotropic packed bed was investigated. In this work laminar 2-D incompressible steady-state equations of momentum and energy were solved numerically by finite volume method. Simulation was done in three Reynolds numbers of 80, 120, and 200. The results indicate that, using porous medium the Nusselt number enhanced considerably for any of cylinders and it presents thin temperature contours for them. Also is shown that by increasing Reynolds number, the heat transfer increased in both channel but the growth rate of it in porous media is larger. In addition, results of simulation in porous channel show that with increasing Peclet number, heat transfer increased logarithmically.

Numerical Modeling of Forced Convection of Nanoionic Liquid [C4mpyrr] [NTf2] with Al2O3 Particles

2021 ◽  
pp. 591-599
Author(s):  
Amra Hasečić ◽  
Armin Hadžić ◽  
Siniša Bikić ◽  
Ejub Džaferović
Keyword(s):  
Numerical Modeling ◽  
Forced Convection ◽  
Al2o3 Particles

The Role of Coulombic Forces in Quasi-Two Dimensional Electrochemical Deposition

1996 ◽  
Vol 451 ◽  
Author(s):  
G. Marshall ◽  
P. Mocskos ◽  
F. Molina ◽  
S. Dengra
Keyword(s):  
Numerical Modeling ◽  
Pattern Formation ◽  
Electrochemical Deposition ◽  
Growth Pattern ◽  
Stokes Equations ◽  
Fluid Motion ◽  
Navier Stokes ◽  
Experimental Measurements ◽  
Dimensionless Numbers ◽  
Navier Stokes Equations

ABSTRACTRecent work demonstrates the relevant influence of convection during growth pattern formation in thin-layer electrochemical deposition. Convection is driven mainly by coulombic forces due to local charges at the tip of the aggregation and by buoyancy forces due to concentration gradients. Here we study through physical experiments and numerical modeling the regime under which coulombic forces are important. In the experimental measurements fluid motion near the growing tips of the deposit is visualized with neutrally buoyant latex spheres and its speed measured with videomicroscope tracking techniques and image processing software. The numerical modeling consists in the solution of the 2D dimensionless Nernst-Planck equations for ion concentrations, the Poisson equation for the electric field and the Navier-Stokes equations for the fluid flow, and a stochastic growth rule for ion deposition. A new set of dimensionless numbers governing electroconvection dominated flows is introduced. Preliminary experimental measurements and numerical results indicate that in the electroconvection dominated regime coulombic forces increase with the applied voltage, and their influence over growth pattern formation can be assessed with the magnitude of the dimensionless electric Froude number. It is suggested that when this number decreases the deposit morphology changes from fractal to dense branching.

scholarly journals Fluid flow in the impulse valve of a hydraulic ram

2020 ◽  
Vol 3 (22) ◽  
Author(s):  
Wojciech Sobieski ◽  
Dariusz Grygo
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Modeling ◽  
Hydrodynamic Pressure ◽  
Water Velocity ◽  
Experimental Measurements ◽  
Ansys Fluent ◽  
Working Cycle ◽  
Numerical Studies ◽  
Minimum Force

The paper presents the results of a study investigating the equilibrium of forces acting on the closing element of the impulse valve in a water ram at the end of the acceleration stage. Acceleration is one of the three main stages in the working cycle of a water ram. In the first part of the paper, we estimated water velocity based on our earlier experimental measurements. We also calculated the minimum force required for closing the impulse valve. The second part of the paper discusses two variants of a numerical model, which was developed in ANSYS Fluent to determine the result-ant hydrodynamic pressure and, consequently, the forces acting on the head of the impulse valve at the end of the acceleration stage. The main aim of this research was to verify the applicability of numerical modeling in water ram studies. The present study was motivated by the fact that Computational Fluid Dynamics is very rarely applied to water rams. In particular, we have not found any numerical studies related to the equilibrium of forces acting on the closing element of the impulse valve in a water ram.

EXPERIMENTAL MEASUREMENTS OF PRESSURE AND VELOCITY FIELDS AROUND CIRCULAR CYLINDERS ARRANGED IN PAIRS

2019 ◽  
Author(s):  
José Leandro Cardoso Rivera Vila ◽  
Pedro Paulo Silva de Almeida ◽  
Thiago Gomes ◽  
Tiago Melo ◽  
jhon goulart
Keyword(s):  
Velocity Fields ◽  
Circular Cylinders ◽  
Experimental Measurements
Sign in / Sign up

Export Citation Format

Share Document