About this Abstract |
Meeting |
2021 AWS Professional Program
|
Symposium
|
2021 AWS Professional Program
|
Presentation Title |
Similarity Analysis of Temperature and Fluid Flow in the GTAW Arc |
Author(s) |
Stefano Yeris Sacco, Patricio Mendez, Marco Ramírez, Alfredo Delgado |
On-Site Speaker (Planned) |
Stefano Yeris Sacco |
Abstract Scope |
This study developed a new mathematical model to quantify the width and length of the plasma arc in GTAW. This novel estimation process allows to obtain immediate results and without convergence problems.
The methodology is based on similarity analysis of the non-isothermal Landau-Squire solution, which is an exact solution of the Navier Stokes and energy equations for a round laminar jet. While the Landau-Squire solution had been used before to approximate velocities in the arc, its application to the prediction of temperature had not been successful. The challenge overcame in this work, is to make a better systematic assessment of the power that must be assigned to the point heat source. The ultimate goal of this project is to obtain general expressions to predict the shape and temperature of the GTAW arc.
The plasma behaviour is modelled parametrically, with a critical temperature dividing the conducting and non-conducting behaviour. For argon, this temperature is 7,200 K.
Numerical simulations that account for temperature-dependent plasma properties were run to compare with the analytical treatment for the case of argon. The maximum error observed was 33 % for a current of 300 A. |
Proceedings Inclusion? |
Definite: Other |