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Determining the volumetric heat capacity (ρcp) of gasses in a calorimetric thermal flow sensor
Wubs, Joram (2025) Determining the volumetric heat capacity (ρcp) of gasses in a calorimetric thermal flow sensor.
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| Full Text Status: | Access to this publication is restricted |
| Embargo date: | 4 July 2026 |
| Abstract: | Thermal flow sensors are widely used to measure the flow of gases and liquids in pipes, tubing and other areas where gas or fluid flow needs to be controlled. The general problem is that the heat transfer that these sensors rely on is dependent on the flow medium. Besides the flow and applied power, the thermal conductivity and volumetric heat capacity of the gasses determine the temperature offset. A flow independent method needs to be used to get these parameters in order to calibrate the sensor on the fly. Typically for thermal flow sensors the 3ω method is used for this. A new sensor is developed that differentiates itself by also being able to measure the direction of the flow. This thesis investigates the possibility of measuring the volumetric heat capacity of gasses in this newly developed thermal flow sensor by using AC actuation. This is done by looking at the out of phase 3 omega component of the voltage over the heater. While no clear flow independent relationship between the measured phase offset and the volumetric heat capacity was found, a flow dependent relation was found instead. However, the measurements do show high repeatability, indicating potential for further development. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 33 physics, 51 materials science, 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/107861 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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