Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/62103
Title: | Characteristics of the IR laser photothermally induced phase change in microchannels with different depths | Authors: | Chen, R He, X Zhu, X Liao, Q An, L Wang, Z Li, S |
Issue Date: | 3-Aug-2016 | Source: | Industrial and engineering chemistry research, 3 Aug. 2016, v. 55, no. 30, p. 8450-8459 | Abstract: | The photothermal effect induced phase change is an important phenomenon in optofluidics. In this work, therefore, the characteristics of the phase change in microchannels with different depths induced by a 1550 nm infrared laser under both low and high laser powers was visually studied. It was revealed that at low laser power, the liquid body could be always advanced as a result of the induced evaporation-condensation-coalescence process regardless of the microchannel depth, which can function as a micro pump. The μ-PIV testing results further demonstrated the coalescence was a dominant mechanism in the interface advancement. Interestingly, although large depth increased the absorption length of the laser and thus improved the temperature and enhanced the evaporation, the advancing effect became weak due to the increase of both the flow resistance and liquid water content to be driven. At high laser power, for small depth microchannel, the liquid body was advanced at the beginning. Once a liquid slug along with a sealed gas slug was formed, the liquid body started to move backward, which can function as chemical separation. However, as the microchannel depth increased, despite that the evaporation was enhanced, such phenomena hardly happen because enhanced evaporation allowed large droplets to be generated. Air bubbles instead of a gas slug were easily entrapped in the liquid body during the coalescence process. These air bubbles quickly grew up due to high temperature, which could be an obstacle to the advancing movement of the liquid body or even block the laser heating. Therefore, it can be concluded that the microchannel depth plays an important role in the photothermally induced phase change process. The obtained results are helpful for the design and operation of the photothermal effect based optofluidic microdevices. | Publisher: | American Chemical Society | Journal: | Industrial and engineering chemistry research | ISSN: | 0888-5885 | DOI: | 10.1021/acs.iecr.6b00648 | Rights: | © 2016 American Chemical Society This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial & Engineering Chemistry Research, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.iecr.6b00648. |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
An_Characteristics_Ir_Laser.pdf | Pre-Published version | 3.32 MB | Adobe PDF | View/Open |
Page views
112
Last Week
0
0
Last month
Citations as of Mar 24, 2024
Downloads
34
Citations as of Mar 24, 2024
SCOPUSTM
Citations
7
Last Week
0
0
Last month
Citations as of Mar 28, 2024
WEB OF SCIENCETM
Citations
6
Last Week
0
0
Last month
Citations as of Mar 28, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.