Influence of the test-chamber shape on the performance of conductometric gas sensors

In this article, CFD simulations results are presented as a key tool to the comprehension of the target gas concentration evolution in a test chamber, at different working conditions. The simulation results are compared with the experimental data, which shows a qualitative good correlation with the...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2022-06, Vol.361, p.131694, Article 131694
Main Authors: Parellada-Monreal, L., Mandayo, G.G., Martín-Mayor, A., Souto-Canteli, I., Bou-Ali, M. Mounir
Format: Article
Language:English
Subjects:
Aluminum
Chamber-position influence
Computational fluid dynamics (CFD)
Concentration gradient
Conductometric gas sensor
Evolution
Finite element method
Gas flow
Gas sensors
Qualitative analysis
Response time
Sensors
Simulation
Temperature dependence
Temperature distribution
Test chambers
Thermography
Time dependence
Working conditions
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Summary:In this article, CFD simulations results are presented as a key tool to the comprehension of the target gas concentration evolution in a test chamber, at different working conditions. The simulation results are compared with the experimental data, which shows a qualitative good correlation with the evolution of the concentration gradient detected. The experiments were carried out using an aluminum gas test chamber, where a WO3 based conductometric sensor is introduced. The results demonstrate how the response time is dependent on the sensor working conditions. Analyzing the CFD and experimental results, some assumptions for this behavior are proposed. The WO3 sensor needs a Pt heating element, which is heated up to 300 °C. As the response is highly temperature-dependent, the temperature distribution on the sensor surface was measured by an IR thermographic camera. The simulation results show that the temperature distribution matches with those obtained experimentally. To validate the model, a mesh and time step convergence study was also implemented. [Display omitted] •CFD simulations help understand fluid dynamics influence in gas sensing mechanisms.•Experimental response time of sensors fits simulated gradient of gas concentration.•Position of sensors in test chambers affects convection and thus sensor response.•Sensor surface temperature affects gas flow and sensor velocity of response.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2022.131694