Publikacje

Abstract:

This study investigated FC-72 boiling heat transfer in minichannels using two
non-contact temperature measurement techniques: liquid crystal thermography (LCT) and
infrared thermography (IRT). These methods were applied simultaneously to measure
temperature distributions on the heated wall surface of minichannels, formed by a thin
metal foil. The temperature data facilitated the calculation of local heat transfer coefficients
at the foil–working fluid contact surface. Calibration of the liquid crystal colour response
to temperature was conducted prior to the use of LCT. According to a comparison of
the heat transfer coefficients and Nusselt numbers determined using LCT and IRT mea-
surements, comparable temperature distributions are provided, with the average relative
differences in heat transfer coefficients determined using these techniques remaining below
15%. The findings highlight the advantages of non-contact temperature measurement
in minimising system disturbances while providing precise data for understanding flow
boiling heat transfer mechanisms. Such results can contribute to the design of minichannel
heat exchangers.

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Liquid Crystal Thermography and Infrared Thermography Application in Heat Transfer Research on Flow Boiling in Minichannels