A novel computational simulation approach to study biofilm significance in a packed-bed biooxidation reactor

Chemosphere ◽  
2021 ◽  
Vol 262 ◽  
pp. 127680
Author(s):  
Mohammad Abbasi ◽  
Javad Aminian-Dehkordi ◽  
Seyyed Mohammad Mousavi
Keyword(s):  
Computational Simulation ◽  
Packed Bed ◽  
Simulation Approach

An Investigation Into Structural-Induced Noise in an Electric Motor

2019 ◽  
Author(s):  
Tung Xuan Vuong ◽  
Willow Yangliu Li ◽  
Ahmed Al-Jumaily ◽  
Neel Pandey
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Frequency Response ◽  
Electric Motor ◽  
Computational Simulation ◽  
Tangential Force ◽  
Radial Force ◽  
Structural Vibration ◽  
Far Field ◽  
Simulation Approach

Abstract The paper presents an investigation into the noise generated by structural vibration of an electric motor used in appliance products using Computational Simulation Approach. In particular, a 3-D numerical simulation model is specifically developed to predict the frequency response of the stator under three different simulation conditions: radial force only, tangential force only and the combination of both forces. The obtained data is used to analyze the acoustic generation in the far-field. Experimental is used to validate the predicted results. It shows the predicted results are very close to experimental results.

scholarly journals A SIMPLIFIED COMPUTATIONAL SIMULATION APPROACH OF FREE ELECTRON LASERS

1993 ◽  
Vol 42 (5) ◽  
pp. 762
Author(s):  
ZHANG SHI-CHANG ◽  
WANG WEN-YAO ◽  
XU YONG
Keyword(s):  
Free Electron ◽  
Computational Simulation ◽  
Free Electron Lasers ◽  
Simulation Approach

scholarly journals Assessment of Shaft Surface Structures on the Tribological Behavior of Journal Bearings by Physical and Virtual Simulation

Lubricants ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 8 ◽  
Author(s):  
Michael Pusterhofer ◽  
Florian Summer ◽  
Michael Maier ◽  
Florian Grün
Keyword(s):  
Cast Iron ◽  
Journal Bearing ◽  
Stokes Equations ◽  
Computational Simulation ◽  
Real Life ◽  
Virtual Simulation ◽  
Surface Finishing ◽  
Simulation Approach ◽  
Fluid Friction ◽  
Micro Topography

Optimizing the surface topography of cast iron crankshafts offers the opportunity to use this material as an alternative to steel in high-performance combustion engines. In the past, this was not possible due to the higher wear on bearing shells and the higher friction losses in relation to forged steel shafts. In order to find an optimized shaft micro topography, the friction and wear behavior of steel and cast iron shafts with different surface treatments were compared to each other, using a combined physical (experimental) and a virtual (computational) simulation approach. The experiments were carried out with a rotary tribometer using a journal bearing test configuration with the possibility to test real-life bearing shells and shaft specimens, manufactured from real-life crankshafts. In the experiments, a polished steel shaft with low bearing wear was effective. The optimization of cast iron crankshafts by a novel surface treatment showed a significant reduction of bearing wear in relation to the classical surface finishing procedures of cast iron shafts. A computational simulation approach, considering the real-life micro topography by using the Navier–Stokes equations for the calculation of micro hydrodynamics, supports the assessment of fluid friction. The virtual simulation shows, in accordance to the experimental results, only a minor influence of the investigated shaft topographies on the fluid friction. Further optimization of shaft surfaces for journal bearing systems seems possible only by the usage of patterned micro topographies.

scholarly journals A multimethod computational simulation approach for investigating mitochondrial dynamics and dysfunction in degenerative aging

Aging Cell ◽  
2017 ◽  
Vol 16 (6) ◽  
pp. 1244-1255 ◽  
Author(s):  
Timothy E. Hoffman ◽  
Katherine J. Barnett ◽  
Lyle Wallis ◽  
William H. Hanneman
Keyword(s):  
Mitochondrial Dynamics ◽  
Computational Simulation ◽  
Simulation Approach

A comprehensive insight on H-type aggregation in Congo red-surfactant systems revealed through spectroscopic and electrochemical study unified with a simulation framework

2019 ◽  
Vol 21 (28) ◽  
pp. 15584-15594 ◽  
Author(s):  
Vinod Kumar ◽  
Dhruvi Patel ◽  
Haridas Pal ◽  
Ketan Kuperkar
Keyword(s):  
Congo Red ◽  
Cationic Surfactants ◽  
Computational Simulation ◽  
Electrochemical Study ◽  
Simulation Approach ◽  
Simulation Framework ◽  
Surfactant Systems ◽  
And Shifts ◽  
Aggregation Phenomenon

Schematic illustration depicting the aggregation phenomenon and shifts in the cationic surfactants-Congo red (CR) dye system investigated through spectral, scattering, voltammetry techniques along with the computational simulation approach.

Unsteady Forced Convection in Packed Beds: Computational and Experimental Analysis

2004 ◽  
Author(s):  
Ricardo Meji´a-Alvarez ◽  
John R. Agudelo ◽  
Ce´sar Nieto ◽  
Laura C. Villa
Keyword(s):  
Flow Field ◽  
Forced Convection ◽  
Computational Simulation ◽  
Particle Diameter ◽  
Packed Bed ◽  
Heating Process ◽  
Flow Profile ◽  
Packed Beds ◽  
Field Variation ◽  
Unsteady Temperature

In this work, a process of unsteady forced convection in a packed bed of spheres was experimentally and computationally analyzed. A device was designed and constructed in order to run the experiments in packed beds. It was used to carry out an experimental run in a packing of ten aluminum spheres, which tube-to-particle diameter ratio was 2,4. Methane-air combustion products were kept flowing into the packed bed at constant inlet conditions, 2,8 m/s and 369°C. Packed spheres were heated from 25°C to gases temperature. While heating, temperature of spheres, tube wall and gases at different positions were measured to follow unsteady process. On the other hand, computational simulation was carried out by modeling the ten-spheres packing under the same flow conditions of the experimental run. Physical properties of gases were kept constant and fluid flow profile was solved before heating process. Results of unsteady temperature variation in different positions showed good agreement with the experimental measures. This result allowed inferring that flow field calculations were a satisfactory representation of the actual flow field, since temperature field variation depends strongly upon flow field. In conclusion, it was found that the Computational Fluid Dynamics (CFD) simulation is an accurate tool to analyze unsteady forced convection in packed beds. The device designed is a flexible and powerful tool to measure unsteady forced convection in packed beds. The behavior of the gas-to-solid heat transfer coefficient is a fundamental question to solve, and CFD supported on experimental measures is the way to solve it.

Heat transfer enhancement of air-concrete thermal energy storage system – CFD simulation and experimental validation under transient condition

2021 ◽  
pp. 095440892110073
Author(s):  
VJ Manoj Praveen ◽  
R Vigneshkumar ◽  
N Karthikeyan ◽  
A Gurumoorthi ◽  
R Vijayakumar ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Computational Simulation ◽  
Packed Bed ◽  
Energy Storage System ◽  
Working Fluid ◽  
Packed Beds ◽  
Thermal Energy Storage System

This investigation studied the packed bed thermal energy storage system with concrete and air used as the energy storage material and working fluid respectively. Three different configurations of packed bed arrangements such as regular ring, staggered ring and staggered ring with clearance are studied. The temperature distribution outcome of the experimental values compared with three-dimensional transient based computational simulation. The flow influencing parameters such as pressure drop, turbulence intensity, design of packed beds, the surface area of packed beds, the void fraction of the system discussed. Experimental results are in excellent agreement with simulation results. It is observed that staggered ring arrangement with the clearance for packed bed have better charging and discharging profile compared to the other two arrangements.

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