fpdaleo_PhD_v3.2_short_mod
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This document summarizes research on surface sensors for temperature and liquid thickness measurement. It describes RTD arrays placed on aluminum substrates that were used to measure temperature in mixing experiments. It also presents the development of miniaturized liquid film sensors, which are thin-film sensors with high spatial resolution that can measure liquid film thickness in two-phase flows through microchannels. The sensors were calibrated and tested in experimental conditions to validate their measurement capabilities.
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fpdaleo_PhD_v3.2_short_mod
- 1. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS LABOR FÜR KERNENERGIESYSTEME 10.12.2016FRANCESCO PAOLO D‘ALEO 1 Surface Sensors for Temperature and Liquid Thickness Measurement
- 2. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Road map 10.12.2016Francesco Paolo D‘Aleo 2 RTD Array on Glass RTD Array on Aluminium Miniaturized Liquid Film Sensors Thermal Fatigue Outline
- 3. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Structure and Dimensions (mm) 10.12.2016Francesco Paolo D‘Aleo 3 53.5 91 RTD “on Aluminium substrate” 4 20 Array 2.5 0.3 0.3 Pt element Side view SU-8
- 4. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Experimental Conditions 10.12.2016Francesco Paolo D‘Aleo 4 A A Xi i ui [m/s] Xi [mm] ΔT [°C] 1 0.2 70 20 2 0.4 150 20 3 0.6 250 20 4 0.8 350 20 5 1 450 20 GEMIX x y u1 (40 °C) u2 (20 °C) = Honeycombs Splitter-plate Grids Thermocouples RTD Array
- 5. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Results 10.12.2016Francesco Paolo D‘Aleo 5 GEMIX F. P. D’Aleo, R. Stalder, H.-M Prasser. Resistive temperature detector arrays on an aluminium substrate; measurements in mixing experiments. 2014 ui
- 6. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Working Principle 10.12.2016Francesco Paolo D‘Aleo 6 Cross section Miniaturized Liquid Film Sensors A Cross Talk Saturation I[-]
- 7. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Technology and Dimensions 10.12.2016Francesco Paolo D‘Aleo 7 Miniaturized Liquid Film Sensors 100150 20 electrodes 18 measuring points
- 8. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Calibration curves 10.12.2016Francesco Paolo D‘Aleo 8 F. P. D’Aleo, P. Papadopoulos, H.-M. Prasser. Miniaturized liquid film sensor (MLFS) for two phase flow measurements in square microchannels with high spatial resolution. 2013 Miniaturized Liquid Film Sensors 160 µm 400 µm MLFSA MLFSB 660 µm 660 µm 5.2 µm resolution
- 9. ||LABORATORY OF NUCLEAR ENERGY SYSTEMS Results 10.12.2016Francesco Paolo D‘Aleo 9 F. P. D’Aleo, P. Papadopoulos, H.-M Prasser. Miniaturized liquid film sensor (MLFS) for two phase flow measurements in square microchannels with high spatial resolution. JFMI (2013). Miniaturized Liquid Film Sensors u= 0.76 m/s u= 0.19 m/s
Editor's Notes
- The MLS is composed by a group of electrodes alternating between the so called Transmitters and receivers, here we analyze as an example a transmitter and receiver pair. The Transmitter electrodes is activated with a certain voltage and if a wetting and conducting layer covers also the receiver electrode, the amount of current that flows is proportional to the layer thickness.