University of Twente Student Theses
Using a Thermal Flow Sensor as a Thermal Conductivity Sensor
Bijsterveld, D.G. (2020) Using a Thermal Flow Sensor as a Thermal Conductivity Sensor.
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| Abstract: | The goal of this Bachelor assignment is to see whether an IQ+ flow sensor [1] from Bronkhorst can be used as a thermal conductivity sensor. The IQ+ flow sensor is a microchip thermal flow sensor which consists of two heaters and three temperature sensors. One of the temperature sensors is sandwiched between the heaters the others are upstream and downstream from the heaters. The flow is measured by the difference in temperature of the upstream and downstream heaters. This is then adjusted with the temperature sensor between the heaters to account for total temperature of the chip affecting the temperature difference between the upstream and downstream heaters. This measurement is dependent on the thermal properties of the measured medium. For this reason the gas and its thermal properties being measured must be known. Adding a thermal conductivity sensor can be used to compensate for the influence of the thermal conductivity. A thermal conductivity sensor can also possibly be used to determine which gas is being measured so the correct thermal properties can be used. To use in addition to the thermal flow sensor would require the thermal conductivity sensor to be able to determine the thermal conductivity independent of flow. In this thesis first some background information will be given. Then the microchip including the flow channel will be modelled. First in two dimensions and in three dimensions without flow, then a model for flow will be added to the 3D model. the models for the three scenarios (2D, 3D and 3D with flow) will programmed in Matlab and be simulated this way. Using the simulation results it will be looked into whether the IQ+ Flow sensor can be used as a thermal conductivity sensor. Some limited measurements will be done and the results of these will be analyzed and compared to the results of the simulations. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 50 technical science in general, 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/82013 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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