Three-dimensional temperature measurement by liquid crystal thermometry and its application to the study of turbulent thermal convection

Nobuyuki Fujisawa, Ronald Adrian

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A new calibration technique of liquid crystal thermometry has been introduced to the quantitative measurement of temperature in a thermal fluid and applied to the study of turbulent thermal convection. The present calibration technique improves the accuracy of temperature measurement in comparison with the classical calibration technique with hue. Three-dimensional temperature measurement of turbulent thermal convection over a horizontal smooth surface is carried out at a flux Rayleigh number of 3×109 by scanning a light sheet normal to the image plane and capturing a number of sequential visualized images. The spatial temperature distributions of thermal plumes over a horizontal surface are demonstrated by the reconstruction of isothermal contour surfaces and various cross-sectional views of the plumes. These results indicate the presence of a polygonal cell structure close to the surface and the generation of plumes at the intersections of high-temperature lines.

Original languageEnglish (US)
Pages (from-to)818-823
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume63
Issue number607
StatePublished - Mar 1997
Externally publishedYes

Fingerprint

free convection
Temperature measurement
Liquid crystals
temperature measurement
liquid crystals
plumes
Calibration
Thermal plumes
Rayleigh number
intersections
Temperature distribution
temperature distribution
Fluxes
Scanning
Temperature
scanning
Fluids
Hot Temperature
Convection
fluids

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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AB - A new calibration technique of liquid crystal thermometry has been introduced to the quantitative measurement of temperature in a thermal fluid and applied to the study of turbulent thermal convection. The present calibration technique improves the accuracy of temperature measurement in comparison with the classical calibration technique with hue. Three-dimensional temperature measurement of turbulent thermal convection over a horizontal smooth surface is carried out at a flux Rayleigh number of 3×109 by scanning a light sheet normal to the image plane and capturing a number of sequential visualized images. The spatial temperature distributions of thermal plumes over a horizontal surface are demonstrated by the reconstruction of isothermal contour surfaces and various cross-sectional views of the plumes. These results indicate the presence of a polygonal cell structure close to the surface and the generation of plumes at the intersections of high-temperature lines.

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