The growth of ice crystals

✍ Scribed by H.C. Simpson; G.C. Beggs; J. Deans; J. Nakamura

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 966 KB
• Volume: 14
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/s0011-9164(00)80262-3

✦ Synopsis

An experimental

investigation is reported of the A-axis and C-axis growth rates in water and brine in a channel immersed in a thermostaticallycontrolled bath. Sin_gle crystals were nucleated from a capillary nucleating head, which could be rotated for measurement of C-axis growth rates. A-axis results are presented for subtoolings from 0. I K to I .O K, for growth in water at velocities between 5 cm/set and 23 cm/set and in brine up 10 6% salt concentration at 5 cm/set and 12.5 cm/set. While growth rates in water agree well with those of previous workers, those in brine are lower than any previously reported_ At low subcootings the growth rate varies linearly with AT, but at higher subcoolings the relationship is u = AATD, where n increases from about I.45 for water to about 2.25 for 5 y0 salt concentration.

A new theory, based on conduction in the ice crystal, is outlined for the growth rate at high AT. and this yields more reasonable values of the constant rl than previous theories. The experimental results presented for C-axis growth indicate considerably lower growth rates than any previously published.