University of Illinois Urbana-Champaign

Three-dimensional temperature measurement in turbulent thermal convection by extended range scanning liquid crystal thermometry

Fujisawa, Noboyuki; Adrian, Ronald J.

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https://hdl.handle.net/2142/112599

Description

Title
Three-dimensional temperature measurement in turbulent thermal convection by extended range scanning liquid crystal thermometry
Author(s)
  • Fujisawa, Noboyuki
  • Adrian, Ronald J.
Issue Date
1998-10
Keyword(s)
  • Thermometry
  • Liquid Crystal
  • Three-dimensional
  • Thermal Convection
Abstract
The usable temperature range of liquid crystal thennometry has been extended and used to measure three-dimensional temperature fields in turbulent thermal convection. The color of the liquid crystals is calibrated against temperature using the standard method in which hue is the single input variable and two new methods: hue/intensity as input variable, and hue, saturation and intensity as input variables to a neural network. Relative to the hue calibration, the new methods extend the range over which temperature can be measured by more than 100%. Three-dimensional temperature measurements of turbulent thermal convection over smooth surfaces were carried out at a flux Rayleigh number of 3 x 109 by scanning a white light sheet normal to the visualized image plane and capturing a number of sequential images at various positions of the light sheet. Stacks of the planar data were composed into three-dimensional temperature distributions. The results indicate the presence of an irregular spoke pattern over the surface and the generation of plumes from the intersections of the patterns, consistent with other investigations.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 892
  • 1998-6018
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112599
Copyright and License Information
Copyright 1998 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.