Abstract
This paper compares two methods applied to measure surface temperatures at an experimental setup designed to analyse flow boiling heat transfer. The temperature measurements were performed in two parallel rectangular minichannels, both 1.7 mm deep, 16 mm wide and 180 mm long. The heating element for the fluid flowing in each minichannel was a thin foil made of Haynes-230. The two measurement methods employed to determine the surface temperature of the foil were: the contact method, which involved mounting thermocouples at several points in one minichannel, and the contactless method to study the other minichannel, where the results were provided with an infrared camera. Calculations were necessary to compare the temperature results. Two sets of measurement data obtained for different values of the heat flux were analysed using the basic statistical methods, the method error and the method accuracy. The experimental error and the method accuracy were taken into account. The comparative analysis showed that although the values and distributions of the surface temperatures obtained with the two methods were similar but both methods had certain limitations.
Highlights
Instruments used to measure temperature can be divided into contact and contactless, according to the way the heat is transferred from the body or medium to be measured to the thermometer.This paper compares the results of temperature measurement realized by contact method based on thermocouples and obtained from infrared thermography, which is an example of a contactless method
The main aim of this study was to compare the results of the temperature measurements performed simultaneously in two parallel minichannels using two different methods: the contact method and the contactless method
Piasecka et al [1] describe a similar analysis, but it was made for two contactless surface temperature measurement methods: infrared thermography and liquid crystal thermography
Summary
This paper compares the results of temperature measurement realized by contact method based on thermocouples and obtained from infrared thermography, which is an example of a contactless method. In their previous research, the authors performed a comparative analysis for two temperature contactless methods: infrared thermography and liquid crystal thermography [1]. The thermocouple-based contact method is commonly used for measuring the surface temperature of liquids and gases. Characteristic temperatures of type E thermocouples and a simple approximation of the relationship between thermal electromotive force (EMF) and temperature T were discussed in [6]. Heichal et al [8] discuss the use of thin film sensors to detect a 15 ns laser pulse
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