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Proceedings Paper

Thermochromic liquid crystals in heat transfer research
Author(s): Jan A. Stasiek; Tomasz A. Kowalewski
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Paper Abstract

In recent years Thermochromic Liquid Crystals (TLC) have been successfully used in non-intrusive heat transfer and fluid mechanics studies. Thin coatings of TLC's at surfaces is utilized to obtain detailed heat transfer data of steady or transient process. Application of TLC tracers allows instantaneous measurement of the temperature and velocity fields for two-dimensional cross-section of flow. Computerized flow visualization techniques allow automatic quantification of temperature of the analyzed surface or the visualized flow cross-section. Here we describe our experience in applying the method to selected problems studied in our laboratory. They include modeling flow configurations in the differentially heated inclined cavity with vertical temperature gradient simulating up-slope flow as well as thermal convection under freezing surface. The main aim of these experimental models is to generate reliable experimental database on velocity and temperature fields for specific flow. The methods are based on computerized true-color analysis of digital images for temperature measurements and modified Particle Image Velocimetry and Thermometry (PIVT) used to obtain the flow field velocity.

Paper Details

Date Published: 27 June 2002
PDF: 10 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472179
Show Author Affiliations
Jan A. Stasiek, Technical Univ. of Gdansk (Poland)
Tomasz A. Kowalewski, IPPT PAN (Poland)

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications
Jolanta Rutkowska; Stanislaw J. Klosowicz; Jerzy Zielinski, Editor(s)

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