Local Heat Transfer Measurements Using Liquid Crystal Thermography Technique

Abstract

The micro-encapsulated thermochromic liquid crystal has been used for the surface temperature measurement using its color change with heat. There are exciting new opportunities to apply this liquid crystal to the investigation of important and interesting heat transfer/fluid flow problems. The various techniques of using liquid crystal for the measurement of the local Nusselt numbers in very complex geometries are presented in this paper.

Characterization of Thermochromic Fibers’ Response to Temperature Change

“…A polymer fiber manufactured in such way that a thermochromic pigment is embedded in the polymeric matrix material develops accordingly thermochromic functionality. If the color change of a thermochromic fiber is reversible, this may be used to develop textiles that can be used for visual temperature indication [3], [4]. In cases that the color change of thermochromic fibers is well defined and the temperature in which it occurs is a priori know with accuracy, these fibers and the corresponding textiles may be used even for medical applications, such as body temperature indication for children, e.g., [5].…”