Numerical study on thin plates under the combined action of shear and tensile stresses

2012 ◽  
Vol 42 (6) ◽  
pp. 867-882 ◽  
Author(s):  
S. Sathiyaseelan ◽  
K. Baskar
Keyword(s):  
Numerical Study ◽  
Thin Plates ◽  
Tensile Stresses ◽  
Combined Action

scholarly journals Numerical study of magnetic particles mixing in waste water under an external magnetic field

2020 ◽  
Vol 69 (3) ◽  
pp. 266-275 ◽  
Author(s):  
Christos Liosis ◽  
Evangelos G. Karvelas ◽  
Theodoros Karakasidis ◽  
Ioannis E. Sarris
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Numerical Study ◽  
Low Frequency ◽  
Water And Wastewater Treatment ◽  
Novel Approach ◽  
Optimal Value ◽  
Frequency Optimum ◽  
Combined Action ◽  
Aligned Magnetic Field

Abstract The combination of nanotechnology and microfluidics may offer an effective water and wastewater treatment. A novel approach combines the use of magnetic particles which can capture heavy metal impurities in microfluidic ducts. The purpose of this study is to investigate the mixing mechanism of two water streams, one with magnetic particles and the other with wastewater. The optimum mixing is obtained when particles are uniformly distributed along the volume of water in the duct for the combined action of a permanent, spatially and temporally aligned magnetic field. Results showed that mixing is enhanced as the frequency of the magnetic field decreases or its amplitude increases, while magnetic gradient is found to play an insignificant role in the present configuration. Moreover, for simulations with low frequency, the mean concentration of particles is found to be twice as high as compared to the cases with higher frequency. Optimum distribution of particles inside the micromixer is observed for the combination of 0.6 T, 8 T/m and 5 Hz for the magnetic magnitude, gradient and frequency, respectively, where concentration reaches the optimal value of 0.77 mg/mL along the volume of the duct.

Heat Transfer Enhancement of Copper-Water Nanofluids in a Lid-Driven Enclosure with Two Mutually Orthogonal Heated Plates

2011 ◽  
Vol 268-270 ◽  
pp. 263-268
Author(s):  
Xiao Feng Wang ◽  
Ding Fang Li ◽  
Feng Hui
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Finite Difference Method ◽  
Heat Transfer Enhancement ◽  
Numerical Study ◽  
Thin Plates ◽  
Transfer Enhancement ◽  
Compact Finite Difference Method ◽  
Copper Water ◽  
Heated Plates

This paper presents the results of a numerical study on the mixed convection in a lid-driven enclosure filled with a copper-water nanofluid and induced by two mutually orthogonal heated thin plates. Two different boundary conditions (isothermal boundary condition and isoflux boundary condition) are considered. The coupled gonverning equations are solved numerically by a fully fourth-order accurate compact finite difference method. A parametric study is conducted and a set of graphical results is presented and discussed to elucidate that significant heat transfer enhancement can be obtained due to the presence of nanoparticles.

Target Configurations for Plate-Impact Recovery Experiments

1992 ◽  
Vol 59 (2) ◽  
pp. 305-311 ◽  
Author(s):  
S. N. Chang ◽  
D.-T. Chung ◽  
Y.-F. Li ◽  
S. Nemat-Nasser
Keyword(s):  
Free Edge ◽  
Surface Velocity ◽  
Thin Plates ◽  
Longitudinal Momentum ◽  
Normal Velocity ◽  
Flyer Plate ◽  
Plate Impact ◽  
Tensile Stresses ◽  
The Impact ◽  
Momentum Trap

Normal plate impact recovery experiments have been perfomed on thin plates of ceramics, with and without a back momentum trap, in a one-stage gas gun. The free-surface velocity of the momentum trap was measured, using a normal velocity (or displacement) interferometer. In all recovered samples, cross-shaped cracks were seen to have been formed during the impact, at impact velocities as low as 27 m/s, even though star-shaped flyer plates were used. These cracks appear to be due to in-plane tensile stresses which develop in the sample as a result of the size mismatch between the flyer plate and the specimen (the impacting area of the flyer being smaller than the impacted area of the target) and because of the free-edge effects. Finite element computations, using PRONTO-2D and DYNA-3D, based on linear elasticity, confirm this observation. Based on numerical computations, a simple configuration for plate impact experiments is proposed, which minimizes the inplane tensile stresses allowing recovery experiments at much higher velocities than possible by the star-shaped flyer plate configuration. This is confirmed by normal plate impact recovery experiments which produced no tensile cracks at velocities in a range where the star-shaped flyer invariably introduces cross-shaped cracks in the sample. The new configuration includes lateral as well as longitudinal momentum traps.

scholarly journals Title of the Integrity Analysis of O&G Standpipe Separator: Numerical Study Article

2018 ◽  
Vol 7 (4.27) ◽  
pp. 73
Author(s):  
Mohd Faizal Hakim Hidzir ◽  
Khairul Imran Sainan ◽  
Hazran Husain
Keyword(s):  
Crude Oil ◽  
Numerical Study ◽  
Oil Quality ◽  
Simulation Method ◽  
Thin Plates ◽  
Working Fluid ◽  
Piping System ◽  
Gas Removal ◽  
Fea Simulation ◽  
Integrity Analysis

A standpipe is a component that functions to remove the condensate of gas from the oil that flows inside the O&G piping system underneath. Efficient gas removal promotes better crude oil quality and increases productivity. The deflector plates integrity in a stand pipe, where thin plates are mounted on the pipe walls periodically in the direction of fluid flow, has been numerically investigated.  The aim of this investigation is to determine how the working fluid density and deflectors thickness influenced the plates integrity. Two working fluids were tested. Natural gas and crude oil which has a higher density. The thickness of the plates was 3 mm and 6 mm. A series of simulation analyses were done analytically through CFD and FEA simulation method using ANSYS software. Based on the results, crude oil produces higher stress onto the plates. This causes large plate deflection. It was observed, the plates near to the standpipe inlet were subjected to the highest stress. Stress on the deflector plates drops as the fluid travel along the pipe height. The deflector plates of 3 mm were failed under these conditions and were not recommended for usage. 

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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