Community Research and Development Information Service - CORDIS

Abstract

The heat pipe has proved simple to operate and has provided a temperature enclosure of exceptional stability and uniformity. Changes in operating temperature are limited by the thermal transfer to the detector and the surrounding furnace, the heat pipe being extremely rapid in response. The heat pipe has been operated to 500 degrees C, and from 500 to 600 degrees C, and it has proved possible to measure the temperature gradient caused by vapour flow along the pipe; simple techniques to minimize this are outlined. Temperature changes occur in the first hours after a major change of pressure, which may be related to gas absorption effects, but long-term drifts, measured over periods up to 20 days, are very small and their measurement is limited by the stability of the thermometers, especially above 800 degrees C. The vapour pressure + temperature relation of Bodhansky and Schins was found to fit the present measurements very closely. It will not be possible to recommend any improvement on their formula until the calibration procedures for the thermometers and pressure gauges have been extensively modified, and the pressure effects in the chimney are fully analyzed.

Additional information

Authors: MCALLAN J V COMMONWEALTH SCIENTIFIC & INDUSTRIAL RESEARCH ORGANIZATION (CSIRO), SYDNEY (AUSTRALIA), COMMONWEALTH SCIENTIFIC & INDUSTRIAL RESEARCH ORGANIZATION (CSIRO), SYDNEY (AUSTRALIA)
Bibliographic Reference: EUR 9310 EN (1984) MF, 39 P., BFR 120, BLOW-UP COPY BFR 195, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989122100600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en