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http://hdl.handle.net/1942/34394
Title: | Single Element Thermal Sensor for Measuring Thermal Conductivity and Flow Rate inside a Microchannel | Authors: | OUDEBROUCKX, Gilles NIEDER, Daniel VANDENRYT, Thijs BORMANS, Seppe Möbius, Hildegard THOELEN, Ronald |
Issue Date: | 2021 | Publisher: | ELSEVIER SCIENCE SA | Source: | Sensors and Actuators A: Physical, 331 (Art N° 112906) | Abstract: | The increasing development of continuous-flow applications in the field of microfluidics generates demand for in-line monitoring methods. The thermal conductivity (κ) of a liquid has been proven to be a valuable measurand for quality control, process monitoring, and analytical testing. However, most available methods for measuring κ of microliter-sized samples are limited for use on stagnant samples. In this work, a novel method and associated prototype device for measuring κ under flow conditions is presented. The so-called Transient Thermal Offset (TTO) method requires only a single metal resistive structure that is excitated with direct current (DC) pulses. To demonstrate the working, proof-of-principle experiments are performed on liquids with various κ under different flow rates. The results show that, after calibration, the presented microfluidic device can be used for accurately measuring κ of liquids under flow, as well as for determining the flow rate of liquids with a known κ. Within the explored ranges, both parameters can be determined with an average error of approximately 2.6%. The results confirm that, also under flow conditions, uncertainties concerning probing depth are eliminated with the TTO method. | Keywords: | microfluidics;continuous-flow;thermal conductivity;flow rate | Document URI: | http://hdl.handle.net/1942/34394 | ISSN: | 0924-4247 | e-ISSN: | 1873-3069 | DOI: | 10.1016/j.sna.2021.112906 | ISI #: | 000706172800017 | Rights: | 2021 Elsevier B.V. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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elsarticle-template_revision1.pdf | Non Peer-reviewed author version | 6.3 MB | Adobe PDF | View/Open |
1-s2.0-S092442472100371X-main.pdf Restricted Access | Published version | 1.72 MB | Adobe PDF | View/Open Request a copy |
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