scholarly journals Formation and manipulation of ferrofluid droplets with magnetic fields in a microdevice: a numerical parametric study

Soft Matter ◽  
2020 ◽  
Vol 16 (41) ◽  
pp. 9506-9518 ◽  
Author(s):  
Venoos Amiri Roodan ◽  
Jenifer Gómez-Pastora ◽  
Ioannis H. Karampelas ◽  
Cristina González-Fernández ◽  
Eugenio Bringas ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Magnetic Fields ◽  
Microfluidic Device ◽  
Parametric Study ◽  
Magnetic Force ◽  
Continuous Phase ◽  
Numerical Parametric Study

Integrated computational fluid dynamics and magnetics simulation is employed to analyze the effects of magnetic force on the formation and manipulation of ferrofluid droplets within a flowing non-magnetic continuous phase in a microfluidic device.

A Practical Method to Study Over and Under-Pressurizing of Ship Tanks During Ballasting and Deballasting

2008 ◽  
Author(s):  
Manoj Kumar
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Parametric Study ◽  
Pressure Rise ◽  
Practical Method ◽  
Hole Diameter ◽  
Maximum Pressure ◽  
Opening And Closing ◽  
Hull Damage

There have been many incidents of hull damage due to over and under-pressurizing of ship tanks during ballasting and deballasting. A safety relief hole of 6 to 8mm diameter is generally provided in Air-pipes to prevent accidental over and under-pressurizing of ship tanks during ballasting and deballasting. This paper investigates the pressure rise and drop inside the tank assuming the air-pipe to be closed. A practical method based on Computational Fluid Dynamics has been presented to find out the maximum pressure rise or drop. A parametric study, based on varying relief hole diameter, has been carried out. The investigation brings to prospective the extent of pressure rise or drop, and hence the damages that can occur due to poor operation of the Air-pipes during ballasting and deballasting and a need for automated opening and closing of the Air-pipes for a safer ship.

scholarly journals Computational fluid dynamics simulation and parametric study of an open channel ultra-violet wastewater disinfection reactor

2014 ◽  
Vol 50 (1) ◽  
pp. 58-71 ◽  
Author(s):  
Rajib Kumar Saha ◽  
Madhumita Ray ◽  
Chao Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Parametric Study ◽  
Open Channel ◽  
Ultra Violet ◽  
Dynamics Simulation ◽  
Inactivation Kinetics ◽  
Cfd Model ◽  
Particle Tracking Method ◽  
Numerical Predictions

The disinfection characteristics of an open channel ultra-violet (UV) disinfection reactor is investigated numerically. The computational fluid dynamics (CFD) model used in this study is based on the volume of fluid (VOF) method to capture the water–air interface. The Lagrangian particle tracking method is used to calculate the microbial particle trajectory and the discrete ordinate (DO) model is used to calculate the UV intensity field inside the reactor. A commercial CFD software package ANSYS FLUENT is used to solve the governing equations. Custom user defined functions (UDFs) are developed to calculate the UV doses. A post-processor is developed in MATLAB to implement the inactivation kinetics of the microbes. The post-processor provides the probabilistic dose distribution and reduction equivalent dose (RED) values achievable in the reactor. The numerical predictions are compared with available experimental data to validate the CFD model. A parametric study is performed to understand the effects of different parameters on disinfection performance of the reactor. The low/high dosed particle trajectories, which can provide an insight for hydraulic and optical characteristics of the reactor for possible design improvements, are identified.

scholarly journals Parametric study of gas-solid flow characteristic by using integration computational fluid dynamics and dynamic simulation

2021 ◽  
Vol 1034 (1) ◽  
pp. 012029
Author(s):  
Candra Damis Widiawaty ◽  
Ahmad Indra Siswantara ◽  
Budiarso ◽  
Asyari Daryus ◽  
Gun Gun Ramdlan Gunadi ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Dynamic Simulation ◽  
Parametric Study ◽  
Flow Characteristic ◽  
Solid Flow

scholarly journals Computational Fluid Dynamics Modeling of the Resistivity and Power Density in Reverse Electrodialysis: A Parametric Study

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 209
Author(s):  
Zohreh Jalili ◽  
Odne Stokke Burheim ◽  
Kristian Etienne Einarsrud
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Power Density ◽  
Parametric Study ◽  
Waste Heat ◽  
Electrical Potential ◽  
Membrane Topology ◽  
Base Case ◽  
Low Grade ◽  
Reverse Electrodialysis

Electrodialysis (ED) and reverse electrodialysis (RED) are enabling technologies which can facilitate renewable energy generation, dynamic energy storage, and hydrogen production from low-grade waste heat. This paper presents a computational fluid dynamics (CFD) study for maximizing the net produced power density of RED by coupling the Navier–Stokes and Nernst–Planck equations, using the OpenFOAM software. The relative influences of several parameters, such as flow velocities, membrane topology (i.e., flat or spacer-filled channels with different surface corrugation geometries), and temperature, on the resistivity, electrical potential, and power density are addressed by applying a factorial design and a parametric study. The results demonstrate that temperature is the most influential parameter on the net produced power density, resulting in a 43% increase in the net peak power density compared to the base case, for cylindrical corrugated channels.

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