University of Oulu

H. Juttula, V. Kaikkonen and A. Mäkynen, "Study of the Aerodynamic Sampling Effects of a Holographic Cloud Droplet Instrument," 2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Dubrovnik, Croatia, 2020, pp. 1-5, doi: 10.1109/I2MTC43012.2020.9129363

Study of the aerodynamic sampling effects of a holographic cloud droplet instrument

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Author: Juttula, Harri1; Kaikkonen, Ville1; Mäkynen, Anssi2
Organizations: 1Unit of Measurement Technology, University of Oulu, Kajaani, Finland
2Optoelectronics and Measurement Techniques, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-11-11


Computational fluid dynamics and particle tracing simulations are presented for a cloud droplet sensor. Airspeeds and streamlines around the sensor are calculated at several wind speeds and their effect on the droplet sampling are examined. Particle tracing is used to study the effect of different wind speeds and droplet sizes on the sampling of the cloud droplets. Simulated droplet concentrations are confirmed by comparing them with measured wind tunnel data. Results demonstrate clear sampling effects that are functions of both wind speed and droplet size. Optimal compromise between maximal measurement volume and sampling effects is found and a simple approximation for sensor’s sampling bias is presented. The results show that CFD simulations can give valuable information about the sampling of droplets in an ideal environment with known droplet concentrations. Even in a wind tunnel, the true test conditions are often impossible to accurately determine. Thus by simulating the sampling effects in different conditions, the sensor can be calibrated for a wide range of naturally occurring cloud conditions.

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Series: IEEE International Instrumentation and Measurement Technology Conference
ISSN: 2642-2069
ISSN-E: 2642-2077
ISSN-L: 2642-2069
ISBN: 978-1-7281-4460-3
ISBN Print: 978-1-7281-4461-0
Pages: 1 - 5
Article number: 9129363
DOI: 10.1109/I2MTC43012.2020.9129363
Host publication: 2020 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2020
Conference: IEEE International Instrumentation and Measurement Technology Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by European Regional Development Fund (ERDF) under European Territorial Cooperation (ETC) program Interreg V A Nord through Grant NYPS 20202472 and in part by Regional Council of Lapland through Grant 126/
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