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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

Limitations for Obtaining Boiling Curves by the Quenching Method with Spheres

Get access (open in a dialog) DOI: 10.1615/IHTC8.4030
pages 2061-2066

Sinopsis

The transient quenching method of obtaining boiling curves, q vs. ΔT, has shown some evidence indicating that it is an efficient alternative to steady state techniques. The quenched specimens for the present study were spheres ranging in diameter from 0.635 to 10.16 cm and constructed from five different high purity metals: aluminum, bismuth, copper, lead, and zinc. This allowed the total quenching time in liquid nitrogen at atmospheric pressure to vary from 30 seconds to 18 minutes. The liquid vessels were cylindrical, and had diameters ranging from 0.76 to 40.6 cm. A minicomputer was employed to monitor the temperature from thermocouples located in each sphere near the surface at three azimuthal angles. Boiling curves were calculated with an inverse finite difference method combined with a linear estimation scheme.
The results indicate an angular dependence of the boiling curve over the sphere surface. The clearance between the sphere and the walls of the liquid container, the sphere diameter, and the metal were also found to significantly influence the shape of the boiling curve of liquid nitrogen.