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Sensors 2017, 17(10), 2330; doi:10.3390/s17102330

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

1
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2
Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
3
Department of Physics, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Capital Normal University, Beijing 100048, China
*
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 10 October 2017 / Accepted: 11 October 2017 / Published: 13 October 2017
(This article belongs to the Special Issue Sensing in Flow Analysis 2017)
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Abstract

Flow characteristics of water were tested in a rectangular microchannel for Reynolds number (Re) 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 Re < 250 and a slow change as Re increases, which is caused by the early transition from laminar to transition flow beginning nearly at Re = 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. View Full-Text
Keywords: water flow; THz-TDS; rectangular microchannel; flow-rate; pressure drop; flow resistance water flow; THz-TDS; rectangular microchannel; flow-rate; pressure drop; flow resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Song, Y.; Zhao, K.; Zuo, J.; Wang, C.; Li, Y.; Miao, X.; Zhao, X. The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy. Sensors 2017, 17, 2330.

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