New experimental apparatus for the study of the Be´nard–Rayleigh problem
作者:
J. Moreno,
J. Jimenez,
A. Co´rdoba,
E. Rojas,
M. Zamora,
期刊:
Review of Scientific Instruments
(AIP Available online 1980)
卷期:
Volume 51,
issue 1
页码: 82-85
ISSN:0034-6748
年代: 1980
DOI:10.1063/1.1136024
出版商: AIP
数据来源: AIP
摘要:
A new experimental system to measure the equivalent thermal conductivity of a liquid with regard to the Be´nard–Rayleigh problem was constructed. The liquid is enclosed within walls of polymethylmethacrylate between two copper plates in which there are thermocouples to measure the difference in temperature between the lower and upper surfaces of the layer of liquid. Heat flux is measured by means of a linear heat fluxmeter consisting of 204 thermocouples in series. The fluxmeter was calibrated and the linear relationship that exists between the heat flux and the emf generated was verified. The thermal conductivity of the polymethylmethacrylate employed was measured and measurements of the equivalent conductivity in cylindrical boundaries of two silicone oils were made. The critical value of the temperature difference and the contribution of the convective process to the transmission of heat were determined.
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