scholarly journals Fluid dynamics calculation of sputtering from a cylindrical thermal spike

2002 ◽  
Vol 65 (16) ◽  
Author(s):  
M. M. Jakas ◽  
E. M. Bringa ◽  
R. E. Johnson
Keyword(s):  
Fluid Dynamics ◽  
Thermal Spike ◽  
Dynamics Calculation

A SEARCH OF AN INDUCER GEOMETRY THAT IS BENEFICIAL FOR LIFTING PARAMETERS OF A LIFTED OBJECT OF A SELECTED SHAPE

Tribologia ◽  
2019 ◽  
Vol 287 (5) ◽  
pp. 13-17
Author(s):  
Bartosz BASTIAN ◽  
Rafał GAWARKIEWICZ
Keyword(s):  
Fluid Dynamics ◽  
Experimental Verification ◽  
Vibration Characteristics ◽  
Squeeze Film ◽  
Acoustic Levitation ◽  
Dynamics Calculation ◽  
Dimension Ratio

The literature describes acoustic levitation phenomena with the utilization of air squeeze film between the vibrating inducer and the lifted object. The objective of the study is to determine the shape of the inducer with vibration characteristics that would allow the levitation of an object of the assumed geometry. In this paper, the influence of the dimension ratio of the inducer on the frequency of the first mode of vibration was presented. CFD calculations for a selected dimension series were performed with the goal of the determination of lifting conditions. The data obtained from the analysis will be used to manufacture an inducer that will serve as an experimental verification for the fluid dynamics calculation.

scholarly journals Analysis of effective pore pressure in asphalt pavement based on computational fluid dynamics calculation

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401668522 ◽  
Author(s):  
Xuedong Guo ◽  
Mingzhi Sun ◽  
Wenting Dai
Keyword(s):  
Fluid Dynamics ◽  
Asphalt Pavement ◽  
Micromechanical Model ◽  
Lower Boundary ◽  
Pore Wall ◽  
Maximum Pressure ◽  
Vehicle Speed ◽  
Exit Slit ◽  
Traffic Loading ◽  
Dynamics Calculation

A micromechanical model was established based on the fluid dynamics theory. This model could be used to calculate several kinds of data when the asphalt pavement under the influence of traffic loading is in water-saturated condition. The results showed that the maximum pressure inside the effective pore was located at the junction between exit slits and the pore wall. There was a positive correlation between the pressure and the vehicle speed. Therefore, the repeated traffic loading could cause emulsification, shift and even peeling of the asphalt membrane. Moreover, the bigger size of the exit slit is, the higher velocity of the fluid has. The high velocity flow keeps scouring both the exit slit and the lower boundary of pore wall. It will cause a bigger slit. Pressure distribution inside the effective pore is related to the number of the exit slit which connect with the pore. More exit slits means bigger pressure inside the effective pore. In addition, if asphalt membranes at exit slits have micro-cracking, the cumulative damage could appear easily and asphalt membranes could be peeled easily. Finally, a test was conducted so as to obtain the bonding strength and adhesion strength between asphalt and aggregate. Then, we can get accurate damage form and position during the scour process by comparing the numerical simulation results with experiment results.

scholarly journals Computational Fluid Dynamics calculation of a planar solid oxide fuel cell design running on syngas

2017 ◽  
Vol 38 (4) ◽  
pp. 513-521
Author(s):  
Paulina Pianko-Oprych ◽  
Tomasz Zinko ◽  
Zdzisław Jaworski
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Flow ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ansys Fluent ◽  
Dynamics Calculation ◽  
Shift Reaction

Abstract The present study deals with modelling and validation of a planar Solid Oxide Fuel Cell (SOFC) design fuelled by gas mixture of partially pre-reformed methane. A 3D model was developed using the ANSYS Fluent Computational Fluid Dynamics (CFD) tool that was supported by an additional Fuel Cell Tools module. The governing equations for momentum, heat, gas species, ion and electron transport were implemented and coupled to kinetics describing the electrochemical and reforming reactions. In the model, the Water Gas Shift reaction in a porous anode layer was included. Electrochemical oxidation of hydrogen and carbon monoxide fuels were both considered. The developed model enabled to predict the distributions of temperature, current density and gas flow in the fuel cell.

scholarly journals Air Behavior Inside Duct of Air Solar Collector with Three Models of Baffles

2020 ◽  
Vol 2 (01) ◽  
pp. 28-33
Author(s):  
Mustapha Henaoui ◽  
Khaled Aliane
Keyword(s):  
Fluid Dynamics ◽  
Heat Exchange ◽  
Solar Collector ◽  
Turbulence Modeling ◽  
Numerical Resolution ◽  
Solar Air Collector ◽  
Air Intake ◽  
Simulation Results ◽  
Dynamics Calculation ◽  
Volume Method

The objective of this work is to study numerically the effect of the geometry of the baffles on the heat exchange in a solar air collector. Three models of collector were used in this study, fitted with simple baffles and perforated baffles. Fluid dynamics calculation (CFD) tool has been used to simulate the geometries of the solar collectors. Its three models involving air intake, are modeled by the FLUENT6.3 software and the grids were created with the Gambit software. The shape of the perforations is in the forms strips perforated in the baffles. The numerical resolution uses the finite volume method and the turbulence modeling K-Epsilon. The results have been validated by previous work and the simulation results are in terms of the evolution of the axial velocity and temperature distribution for the three models.

Observation on sloshing flow and hydrodynamic pressures on cylindrical liquefied natural gas tank with swash bulkhead

2020 ◽  
pp. 147509022095999
Author(s):  
Jeoungkyu Lee ◽  
Yangjun Ahn ◽  
Jieung Kim ◽  
Yonghwan Kim ◽  
Kyung-Kyu Yang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Resonance Frequency ◽  
Frequency Ratio ◽  
Internal Flow ◽  
Liquefied Natural Gas ◽  
Frequency Range ◽  
Type C ◽  
Dynamics Calculation ◽  
The Impact

In this study, a series of sloshing model tests were conducted for type-C tanks, particularly to observe the effects of the inner bulkhead and rings. In regular pitch motion, the internal flow by swash bulkhead and rings located inside the tank was observed. The frequency range near the resonance frequency was checked at filling heights of 70%, and sloshing-induced impact pressures were investigated. Through this study, the global flows inside the tank and local flows during impact occurrence at the hemispherical end of the tank were systematically observed, and the impact pressure pattern for each frequency ratio was compared. Due to the swash bulkhead located in the center of the tank, the flow does not move at once and the velocity of the flow is reduced by the inner rings. The flows passing through the swash bulkhead proceed with a time difference, overlapping with the first wave, generating various types of sloshing impact. The results of computational fluid dynamics calculation and the experiment were also compared for limited conditions.

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