Numerical analysis and experimental study of the effect of workpiece thickness on flow field in laser cutting

2010 ◽  
Vol 15 (6) ◽  
pp. 676-683
Author(s):  
Jun Hu ◽  
Xiao-jun Sheng ◽  
Jing-wen Luo
Keyword(s):  
Experimental Study ◽  
Numerical Analysis ◽  
Flow Field ◽  
Laser Cutting

EXPERIMENTAL STUDY OF INFLUENCE OF ACTIVE METHODS OF FLOW CONTROL ON THE FLOW FIELD PAST A CYLINDER

2009 ◽  
Vol 16 (4) ◽  
pp. 353-366 ◽  
Author(s):  
Milan Matejka ◽  
Petr Pick ◽  
Jiri Nozicka ◽  
Pavel Prochazka
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Flow Control

Experimental Study of Turbulent Macroinstabilities in an Agitated System with Axial High-Speed Impeller and with Radial Baffles

1996 ◽  
Vol 61 (6) ◽  
pp. 856-867 ◽  
Author(s):  
Oldřich Brůha ◽  
Ivan Fořt ◽  
Pavel Smolka ◽  
Milan Jahoda
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
High Speed ◽  
Experimental Results ◽  
Turbulent Regime ◽  
Frequency Of Occurrence ◽  
Visualization Method ◽  
Entire Flow

The frequency of turbulent macroinstability occurrence was measured in liquids agitated in a cylindrical baffled vessel. As it has been proved by preceding experimental results of the authors, the stochastic quantity with frequency of occurrence of 10-1 to 100 s-1 is concerned. By suitable choosing the viscosity of liquids and frequency of impeller revolutins, the region of Reynolds mixing numbers was covered from the pure laminar up to fully developed turbulent regime. In addition to the equipment making it possible to record automatically the macroinstability occurrence, also the visualization method and videorecording were employed. It enabled us to describe in more detail the form of entire flow field in the agitated system and its behaviour in connection with the macroinstability occurrence. It follows from the experiments made that under turbulent regime of flow of agitated liquids the frequency of turbulent macroinstability occurrence is the same as the frequency of the primary circulation of agitated liquid.

Numerical Analysis of the Turbulent Flow Field Applied to Thermal Spallation Drilling

2004 ◽  
Author(s):  
Angela O. Nieckele ◽  
Luis Fernando Figueira da Silva ◽  
Joa˜o Carlos R. Pla´cido
Keyword(s):  
Reynolds Number ◽  
Numerical Analysis ◽  
Flow Field ◽  
Gas Phase ◽  
Accurate Determination ◽  
Rock Surface ◽  
Drilling Technique ◽  
High Reynolds ◽  
Drilling Conditions ◽  
Volume Method

Thermal spallation is a possible drilling technique which consists of using hot supersonic jets as heat source to perforate hard rocks at high rates. This work presents a numerical analysis of a typical spallation drilling configuration, by the finite volume method. The time-averaged conservation equations of mass, momentum and energy are solved to determine the turbulent compressible gas phase flow field. Turbulence is predicted by the classical high Reynolds number κ-ε model, as well as with a low Reynolds number κ-ε model. The influence of the jet Reynolds number is investigated. Special attention is given to the rock surface temperature, since its accurate determination is required to predict spallation rates under field-drilling conditions.

Numerical analysis of the effect of the TEM00radiation mode polarisation on the cut shape in laser cutting of thick metal sheets

2005 ◽  
Vol 35 (2) ◽  
pp. 200-204 ◽  
Author(s):  
A V Zaitsev ◽  
O B Kovalev ◽  
Anatolii M Orishich ◽  
V M Fomin
Keyword(s):  
Numerical Analysis ◽  
Laser Cutting ◽  
Metal Sheets

Numerical analysis of the acoustic and flow field associated with perforated liners with variable acoustic forcing

2013 ◽  
Author(s):  
Cosimo Bianchini ◽  
Antonio Andreini ◽  
Bruno Facchini ◽  
Ignazio Vitale ◽  
Fabio Turrini
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Acoustic Forcing
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