scholarly journals Experimental validation of computational fluid dynamic codes (CFD) for liquid-solid risers in clean alkylation processes

2002 ◽  
Vol 56 (12) ◽  
pp. 497-505
Author(s):  
Milorad Dudukovic ◽  
Muthanna Al-Dahhan ◽  
Shantanu Roy ◽  
Abdenour Kemoun
Keyword(s):  
Computed Tomography ◽  
Computational Fluid Dynamic ◽  
Particle Tracking ◽  
Experimental Validation ◽  
Fluid Dynamic ◽  
Scale Up ◽  
Solid Catalyst ◽  
Cfd Simulations ◽  
Reactor Type ◽  
Ct Data

This manuscript, based on the presentation given by one of the authors (M.P. Dudukovic) at the Technological and Engineering Forum in Pancevo, May 21 2002, summarizes the use of the computer automated radioactive particle tracking (CARPT) and gamma computed tomography (CT) in obtaining the data needed to validate the Euler-Euler based CFD simulations for solids distribution, flow pattern and mixing in a liquid-solid riser. The riser is one of the reactors considered for acid solid catalyst promoted alkylation. It is shown that CFD calculations, validated by CARPT-CT data, show promise for scale-up and design of this novel reactor type.

Smoke Simulation in an Underground Train Station Using Computational Fluid Dynamic

2014 ◽  
Vol 663 ◽  
pp. 366-372 ◽  
Author(s):  
Zambri Harun ◽  
Muhammad Saiful bin Sahari ◽  
Taib Iskandar Mohamad
Keyword(s):  
Computational Fluid Dynamic ◽  
Fire Safety ◽  
Fluid Dynamic ◽  
Fire Department ◽  
Cfd Simulations ◽  
Train Station ◽  
Hazardous Gases ◽  
Design Software ◽  
Underground Station ◽  
Safety Systems

The design of the ventilation and fire safety systems for the Johor Bahru Sentral, a semi-underground train station, part of the Integrated Custom, Immigration and Quarantine Complex (ICIQ) is based on normal Malaysian Standards (MS), British Standards and the local fire department’s requirements. However, the large and complex space in the underground station coupled with scheduled diesel-powered locomotives which frequent the station by stopping or passing require detailed simulations. Both ventilation and the fire safety systems employ Computational Fluid Dynamic (CFD) methods to provide realistic balance against the typical calculations based on spread sheets and certain design software. This study compares smoke simulations results performed by the mechanical and fire consultants with the simulations carried out through this project. An assumption of a locomotive catches fire near the main platform is made. The burning locomotive is the source of the smoke while the occupants on platforms and waiting areas are the subjects to escape safely. The process of the simulation includes modelling and meshing processes on the structure of the railway station imported from Inventor CAD Autodesk software drawing. The CFD simulations are performed using Star-CCM+. The smokes flow around the building with buoyancy forces and extracted via exhaust fans. Through these simulations, we found that when a locomotive catches fire, the passengers could evacuate the building safely before the fire department machinery arrives. Furthermore, we notice that the ventilation fans activation based on detection of hazardous gases may not be efficient way to remove the latter. A schedule clean-up sync with train arrivals effectively removes toxic gas.

Computational fluid dynamic analysis of innovative design of solar-biomass hybrid dryer: An experimental validation

2016 ◽  
Vol 92 ◽  
pp. 185-191 ◽  
Author(s):  
Sonthawi Sonthikun ◽  
Phaochinnawat Chairat ◽  
Kitti Fardsin ◽  
Pairoj Kirirat ◽  
Anil Kumar ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Computational Fluid Dynamic ◽  
Experimental Validation ◽  
Fluid Dynamic ◽  
Computational Fluid Dynamic Analysis ◽  
Innovative Design

scholarly journals A Computational Fluid Dynamic Study of Developed Parallel Stations for Primary Fans

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1607
Author(s):  
Juan Pablo Hurtado ◽  
Gabriel Reyes ◽  
Juan Pablo Vargas ◽  
Enrique Acuña
Keyword(s):  
Computational Fluid Dynamic ◽  
Energy Cost ◽  
Fluid Dynamic ◽  
Shock Pressure ◽  
Cfd Model ◽  
Blade Angle ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Operating Points ◽  
Over Time

A Computational fluid dynamic (CFD) model was developed considering three geometries for primary parallel fan stations that have already been developed, implemented, and are currently in operation within Chilean mines. To standardize the comparison, the same primary fan was used in all the simulations with a unique set of settings (speed, blade angle, and density). The CFD representation was used to determine the operating point per configuration and compare the performances in terms of airflow and pressure delivered. This approach allowed ranking primary fan station geometry based on resistance curve and energy consumption of the fan. This paper presents the results obtained through the CFD simulations and the corresponding primary fans operating points of each configuration: symmetrical branches (SB), overlap branches (OB), and run around (RA) bypass. The RA configuration was identified as the best-performing station geometry on the lowest frictional and shock pressure losses, highest airflow delivery, and lowest energy cost. The results are discussed, considering pressure, velocity, and vector contours to understand the fluid dynamics phenomena occurring inside the station. The capital cost involved in the development of each primary parallel station was considered in the analysis in addition to the energy cost to determine the economic configuration over time.

Biplane Angiography for Experimental Validation of Computational Fluid Dynamic Models of Blood Flow in Artificial Lungs

ASAIO Journal ◽  
2013 ◽  
Vol 59 (4) ◽  
pp. 397-404 ◽  
Author(s):  
Cameron C. Jones ◽  
Patrizio Capasso ◽  
James M. McDonough ◽  
Dongfang Wang ◽  
Kyle S. Rosenstein ◽  
...  
Keyword(s):  
Blood Flow ◽  
Computational Fluid Dynamic ◽  
Experimental Validation ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Artificial Lungs ◽  
Biplane Angiography

Modern Trends in CFD Simulations: Application to GTL Technology

2006 ◽  
Vol 1 (1) ◽  
Author(s):  
Abid Akhtar ◽  
Vishnu K Pareek ◽  
Moses O Tade
Keyword(s):  
Multiphase Flow ◽  
Bubble Column ◽  
Fluid Dynamic ◽  
Scale Up ◽  
Operating Conditions ◽  
Special Focus ◽  
Cfd Simulations ◽  
Multiphase Reactors ◽  
Flow Processes ◽  
Gas To Liquid

Multiphase flow processes are frequently observed in several important reactor technologies. These technologies are found in diverse applications such as in manufacture of petroleum-based fuels and products, conversion of synthesis gas into liquid hydrocarbons (Gas-to-liquid technology), production of commodity chemicals, pharmaceuticals, herbicides, pesticides, polymers etc. Due to the inherent complexity of these processes, the knowledge of fluid dynamic and transport parameters is necessary for development of appropriate reactor models and scale-up rules. It is, therefore, of paramount importance to develop understanding and predictive tools to simulate multiphase flow processes for better and economically viable reactor technologies. In the past, knowledge of hydrodynamics and transport characteristics of multiphase reactors has been interpreted in the form of empirical correlations, which have numerous restrictions in terms of their validity for different operating conditions. Computational fluid dynamics (CFD) simulation, on the other hand, deals with the solution of fluid dynamic equations on digital computers, requiring relatively few restrictive assumptions and thus giving a complete description of the hydrodynamics of these reactors. This detailed predicted flow field gives an accurate insight to the fluid behaviour and can sometimes give information, which cannot be obtained from experiments. These days, due to cheaper computational resources, CFD simulations are becoming economically reliable for modeling of multiphase processes including GTL (Gas-to-liquid) processes. In this paper, a comprehensive review of different multiphase flow simulation approaches has been presented. The recent progress made in hydrodynamic modeling of multiphase reactors, their capabilities and limitations (with special focus on GTL processes) are discussed in detail. Finally, case studies with different simulation approaches (Eulerian-Eulerian and VOF (Volume of fluid) simulations of bubble column reactors operating in different flow regimes) are discussed to demonstrate the power of this emerging research tool.

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