Projekt: Simulering av konvergent-divergenta gasmunstycken vid gasatomisering

The production of metal powders rely on gas jets in order to break up the liquid metal into smaller particles. In this report simulation software was used to calculate how the gas would behave based on given input. The simulations shows that an increase in pressure leads to a higher throughput through the nozzle, with density increasing linearly. Furthermore the results shows that when increasing the pressure the temperature is raised as a result as well as a turbulence increase.

Författare:  Erik Larsson, Joel Debesai och Viktor Pettersson (Åva gymnasium, Täby, Stockholm)

Projekt: Karakterisering av metallpulver för additiv tillverkning

The purpose of the project was among others to study the effect of three different humidities (dry, slightly moist and not dry) on metal powder flowability by three methods: Hall flowmeter, Angle of repose and Rheometer. The best flowability was obtained for “slightly moist powder” with the Hall flow meter method, no significant difference in flowability was obtained for the Angle of Repose method but the rheometer method showed that the best flowability was obtained for dried powder.

Författare: Michael Jönsson-Valencik, Gustav Wallin och Omar Sulaiman (Åva gymnasium, Täby, Stockholm)

Projekt: Energiförlust Skänkmetallurgi

The main purpose of this study is to calculate and measure the energy loss that is present in the part of steelmaking that is referred to as ladle metallurgy with a thermal. The specific questions that were studied are what physical phenomena's are present when energy is lost from the ladle, how much energy is lost during the time during of which the ladle is filled with melted steel as well, and how does the heat transportation differ between a ladle with and without a lid. This study is based on calculations and measurements guided by previously published material on the topic of steelmaking. The results found that heat energy from the steel is transferred through the three essential physical phenomena's: Conduction, convection and radiation. The total amount of energy that is lost from the ladle has been calculated from a ladle without a lid and from a ladle with a lid. The difference between the energy that is lost from a ladle without a lid and a ladle with a lid is considerable. A conclusion can be made that introducing a lid through the extensive part of ladle metallurgy reduces radiation from the ladle with 28 percent's and would be a far-reaching adjustment in order to make ladle metallurgy more sustainable from an energy- and environmental perspective.

Författare: Gustav Edström, Luleå Gymnasieby