The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy

Flow characteristics of water were tested in a rectangular microchannel for Reynolds number ( ) between 0 and 446 by terahertz time domain spectroscopy (THz-TDS). Output THz peak trough intensities and the calculated absorbances of the flow were analyzed theoretically. The results show a rapid chang...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2017-10, Vol.17 (10), p.2330
Main Authors: Song, Yan, Zhao, Kun, Zuo, Jian, Wang, Cuicui, Li, Yizhang, Miao, Xinyang, Zhao, Xiaojing
Format: Article
Language:English
Subjects:
Flow characteristics
Flow resistance
flow-rate
Fluid dynamics
Fluid flow
Laminar flow
Microchannels
pressure drop
rectangular microchannel
Reynolds number
Spectrum analysis
THz-TDS
Transition flow
Water flow
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Summary:Flow characteristics of water were tested in a rectangular microchannel for Reynolds number ( ) between 0 and 446 by terahertz time domain spectroscopy (THz-TDS). Output THz peak trough intensities and the calculated absorbances of the flow were analyzed theoretically. The results show a rapid change for < 250 and a slow change as increases, which is caused by the early transition from laminar to transition flow beginning nearly at = 250. Then this finding is confirmed in the plot of the flow resistant. Our results demonstrate that the THz-TDS could be a valuable tool to monitor and character the flow performance in microscale structures.
ISSN:1424-8220
1424-8220
DOI:10.3390/s17102330