Biot number behaviour in the Chill Block Melt Spinning (CBMS) process

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 the CBMS 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 the Bis/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.