Transient hot-strip method for simultaneously measuring thermal conductivity and thermal diffusivity of solids and fluids

Abstract

A transient hot-strip method has been developed for use with solids and fluids with low electrical conductivity. The hot strip (thin metal foil) is used both as a constant plane heat source and a sensor of the temperature increase. The accuracy of the method is so good that it might even be used for the measurement of the specific heat especially under difficult experimental conditions when the standard methods cannot be used or would be very inconvenient. This method has been tested in measurements on fused quartz, glycerine and Araldite at room temperature. The experimental conditions that cause deviations from the mathematical solution of the thermal conductivity equation are discussed and estimates for their maximum influence on the measured quantities are given.

G-Plus report to Owens Corning-thermal conductivity Measurements of Fiberglass

“…Thermal conductivity is calculated directly from the experimental data. Detailed theory and experimental descriptions of the Hot Disk technique can be found in references [1][2][3].…”

Zastosowanie algorytmów inteligencji obliczeniowej do wyznaczania właściwości cieplnych materiałów

“…Transient Hot Strip, THS) zaproponowana w [3]. Polega ona na umieszczeniu cienkiej taśmy grzewczej w badanym ośrodku i wywołaniu stanu nieustalonego przewodzenia ciepła poprzez zasilenie jej prądem elektrycznym o stabilizowanym natężeniu.…”

Properties of Metal Powders for Additive Manufacturing: A Review of the State of the Art of Metal Powder Property Testing

“…The strip acts as a heat source and indicates its own temperature increase as well. A temperature increase causes an increase in the electrical resistance of the strip, so by monitoring the output voltage of the strip, one can obtain information about the thermal conductivity of the surrounding material [44]. A constant current is supplied to the metal strip, which provides a constant output of power.…”