Biot number behaviour in the Chill Block Melt Spinning (CBMS) process. (25th June 2016) - Pagnola, M.
Highlights: It's shown the Newtonian cooling in the thin ribbons' solidification process. Are studied the behaviour of the Biot number at the interfaces of the process of CBMS. Local vortexes that appear in the surrounding atmosphere. A small change in the determination of the local convection coefficient in the liquid/air interface appear. Abstract: This paper shows the change obtained in the Biot number ( Bi ) during the adhesion interface and the contact between phases, where the cooling and solidification of the ribbon obtained by theCBMS process occurs. This change shows an increase in the number of Bi according to the tangential velocity of the copper wheel ( Vx ) in the pressure range of the tests that define the ejection speeds in the nozzle ( Vo ). The present study demonstrates that a zone where Vo is close to 2 m/s appears, and a transition of theBis/l numbers from magnitudes below unity until this value is exceeded can be observed. In this study, the Bis / l > 1 values indicate that Newtonian cooling occurs during the ribbon's solidification process and show that the convective forces on the external part of the solidifying mass begin to influence the amount of heat transferred during the liquid/solid phase in the adhesion zone.