Uses and limitation of different thermometers for measuring heating efficiency of magnetic fluids
| Autor: | Andrzej Skumiel, Tomasz Hornowski, Błażej Leszczyński, Marceli Koralewski, Arkadiusz Józefczak |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Temperature measurement Industrial and Manufacturing Engineering 0104 chemical sciences law.invention Magnetic field Nuclear magnetic resonance law Thermocouple Thermometer Eddy current Measuring instrument Magnetic nanoparticles 0210 nano-technology Pyrometer |
| Zdroj: | Applied Thermal Engineering. 100:1308-1318 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2016.02.063 |
| Popis: | This paper presents the results of the heating of magnetic fluid (MF) containing magnetite nanoparticles. Volume concentration of magnetite nanoparticles ( ϕ V = 2.76%) was determined from magnetic experiments. Mean diameter 〈 d 〉 = 12.7 nm and its standard deviation s = 5.0 nm of the core of magnetic particles were obtained using TEM technique. Magnetic fluid heating experiments were carried out at a frequency of 440 kHz for magnetic field strength up to 3 kA⋅m −1 using lab-made experimental set-up. For temperature measurements, various kinds of devices were used: pyrometer, thermocouple thermometer, optical fiber temperature sensor and thermometer with ultrasonic sensor. Specific absorption rate (SAR) and temperature measurement error were calculated and discussed for all the thermometers used. The influence of eddy currents induced in a thermocouple on the determination of temperature of MF was described. The usefulness of different types of temperature measuring devices and their accuracy in determining the heating rate and the SAR coefficient of the magnetic fluid were analyzed and discussed. |
| Databáze: | OpenAIRE |
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