Showing papers by "Instituto Tecnológico de Morelia published in 1996"
TL;DR: In this paper, steel flow and heat transfer in tundishes under non-isothermal and non-adiabatic conditions are physically and mathematically modeled, where thermal step inputs in both types of models are applied and temperature measurements as well as computations of flow at unsteady state are carried out.
Abstract: Steel flow and heat transfer in tundishes under non-isothermal and non-adiabatic conditions are physically and mathematically modeled. For this purpose thermal step inputs in both types of models are applied and temperature measurements as well as computations of flow and heat transfer at unsteady state are carried out. Experimental measurements of output responses to thermal step inputs fed in the tundish model and the transient solution of the three dimensional Navier-Stoke's equations keep a very good agreement. Isothermal lines of water model and those belonging to the prototype under non-adabatic conditions are not equivalent for the same thermal step input and this promotes different velocity fields of water in the model and liquied steel in the prototype. As velocity fields have a direct influence on inclusions removal from steel to the covering tundish slag it is recommended to have caution on the employment of non-isothermal water models to interpret the actual behavior of steel flow and inclusions dynamics in industrial tundishes.
22 citations
TL;DR: In this article, steel flow and heat transfer in tundishes heated by plasma is physically modeled using a water model with tracer injections and the experimental results are interpreted through a turbulent k-e mathematical model.
Abstract: Steel flow and heat transfer in tundishes heated by plasma is physically modeled using a water model with tracer injections and the experimental results are interpreted through a turbulent k-e mathematical model. The thermal modeling was carried out using step temperature inputs to decrease by 7 K the initial water temperature followed by a heating stage by a steam jet that simulates the plasma heating process of liquid steel in the tundish. To make valid the scaling operation of the plasma heating from the steam jet experiments a dimensionless plasma heating number was derived. The thermal response of the cooling-heating cycles was well predicted by a double dispersion coefficient model. On the other hand, the mathematical model indicates that the steam jet acts as a brake of the velocity for the liquid volume just under its direct contact lossing momentum. This loss of momentum is compensated by slight increases of the liquid velocities in the liquid volumes that are out the direct action of the steam jet.
14 citations