TEMPERATURE FLUCTUATIONS IN FRACTIONAL SOLIDIFICATION OF ORGANICS,

Abstract

Temperature measurements were made inside zone melting and progressive freezing tubes. Short-term fluctuations of up to 3.7C were found. These resulted from drops falling into the melt, unsteady free convection in the melt and on the outside of the tube, and drafts in the room. We believe that these fluctuations cause impurity striations or banding and thereby reduce fractionation. In addition, variations of up to 2.5C over periods on the order of hours were observed.

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1967
Accession Number
AD0814190

Entities

People

  • W. R. Wilcox

Organizations

  • The Aerospace Corporation

Tags

DTIC Thesaurus Topics

  • Convection
  • Critical Temperature
  • Fractionation
  • Freezing
  • Glass Transition Temperature
  • Impurities
  • Isothermal Processes
  • Measurement
  • Melting
  • Melts
  • Phase Transformations
  • Solidification
  • Striations
  • Transition Temperature
  • Zone Melting

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Materials Science and Engineering.
  • Mathematics or Statistics