Product Code: ICA12_805

Mass and Momentum Transfer of Oxygen Jet to the Melt in Laser Cutting of Mild Steel
Authors:
Grigoriy Ermolaev, Institute of Theoretical and Applied Mechanics SB RAS; Novosibirsk Russia
Alexander Zaitsev, Institute of Theoretical and Applied Mechanics SB RAS; Novosibirsk Russia
Presented at ICALEO 2012

Momentum and heat transfer of inert gas jet to the melt in laser cutting is studied well by numerous researchers. Gas dynamic conditions of cutting with oxygen are significantly different from inert cutting: only 0.3 bar of high purity oxygen are enough to cut 10mm plate. Such a pressure level is absolutely insufficient for inert gas cutting. This paper is focused on the influence of combustion reaction on mass and momentum transfer of oxygen jet inside laser cut kerf. Dynamics of oxygen/non-reacting gas mixture is studied with the help of numerical simulation.
Oxygen consumption of chemical reaction changes flow pattern inside kerf significantly. Momentum transfer takes place due to friction force and due to direct consumption of accelerated oxygen. The main factor resulting in momentum and mass transfer in a system is oxygen purity.

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