Effects of thermocouple electrical insulation on the measurement of surface temperature

Abstract

there is no specific value for the critical radius and the rate of heat flux around the thermocouple wire continuously increases with the wire diameter even when this is larger than the critical radius. Numerical simulation using COMSOL Multiphysics software also confirms that there is negligible thermal effect from the electrical insulation. Moreover, the experimental results agree well with those obtained by both the analytical and numerical methods and further confirm that the diameter of the thermocouple has an impact on the temperature measurement.

Liquid cooling of non-uniform heat flux of a chip circuit by subchannels

“…2). Furthermore, the actual contact area between probe and the surface was different for each thermocouple which altered their thermal contact resistance [28]. Accordingly, it is possible to see a different percentage error for each thermocouple.…”

“…The thermocouple wires were pushed through the thermal insulation material to prevent any contact between the wires and the other surfaces (e.g. ceramics base), which could result in the possibility of conduction error through the wires [28]. The inlet water temperature was measured by immersing a thermocouple type K of size 200µm in the water container.…”

Thermocouple heating impact on the temperature measurement of small volume of water in a cooling system

“…The thermocouple wires were treated as a very long fin and the temperature corresponding to the environmental temperature was determined [31]. Further details are shown in Al-Waaly [6]. Fig.…”

“…Thermocouples can have an impact on the temperature of an object being measured due to heat conduction through the wires when the wires are exposed to a surrounding environment with temperature different to the measured temperature. This heat transfer occurs through the wires which then disturbs the system, causing an error in the temperature measurement [1][2][3][4][5][6]. This thermocouple heating effect can be reduced by decreasing the temperature difference between the thermocouple probe and external environment or reducing the size of thermocouple wires and their thermal conductivity [6,7].…”

Analysis of infrared temperature measurement for flue gas shielding metal surface using Source Multi-Flux method

“…For the surface temperature measurement, practical applications generally use contact measurement methods, such as thermocouple, thermal resistance, as well as temperature thermometer [3][4][5]. In the current superheater temperature measurement methods, thermocou---------------* Corresponding author's, e-mail: wwangcn@163.com, zhangbiao@seu.edu.cn THERMAL SCIENCE: Year 2018, Vol.…”