On Liquid Crystal Thermography For
Determination Of The Heat Transfer Coefficient
In Rectangular Ducts
Author(s)
Z. Ghorbani-Tari, B. Sunden & G. Tanda
Abstract
Liquid crystal thermography (LCT) has been employed by researchers in heat
transfer and fluid flow communities as a reliable and non-intrusive temperature
measurement technique. This technique correlates the colour response to
temperature for a heated surface which has been treated with thermochromic
liquid crystals (TLCs). The LCT has been used extensively in convective heat
transfer research in duct flows. In this paper, some experiences by LCT in
thermal measurements for rectangular duct flows are provided. A few TLCs
examples associated with continuous ribs for two different values of rib pitch-toheight
ratio of 4 and 8 at Re=8900 and 28500 are illustrated. Important issues
such as heating principles, calibration of TLCs, image acquiring and analysis,
problems of treating the surface by TLCs, and expected measurement accuracy
are summarized. The main purpose is to assist newcomers in the field and
provide some guidelines for proper use of the LCT in heat transfer research.
Keywords: LCT, convective heat transfer, measurement accuracy.
1 Introduction
Liquid crystal thermography (LCT) has emerged as reliable measurement
sensors for the visualization and determination of surface temperature
distributions leading to convective heat transfer coefficients [1]. The advantages
of LCT are, e.g., its flexibility to be used from micron sized electronic circuits to
Keywords
LCT, convective heat transfer, measurement accuracy
Related Book
Other papers in this volume
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