IR laser assisted photothermal condensation in a microchannel

He, Xiao‐Ting; Chen, Rong; Liu, Qiang; Wang, Hong; Zhu, Xun; Xu, Qing-Yun; Li, Shuzhe; Xiao, Siyang

doi:10.1016/j.ces.2014.08.029

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Besides, the coalescence of the moving liquid column and droplets also plays a significant role in a micropump based on the photothermal effect of photothermal nanoparticles [11], in which the authors believed that the coalescence between the liquid column and droplets could advance the liquid movement. Moreover, our recent studies also verified the actuated mechanism in the rectangular microchannels by the experimental work of the infrared laser photothermally assisted condensation [12] and the simulation work of the dynamic behaviors between the liquid column and a droplet [13,14]. It was found that the coalescence with the droplet could advance the liquid column movement as a result of the induced curvature at the interface, which lowered the average liquid pressure near the interface and finally promoted the liquid column movement.…”

Section: Introductionsupporting

confidence: 53%

Numerical investigation of the moving liquid column coalescing with a droplet in triangular microchannels using CLSVOF method

Chen

Wang

et al. 2015

Science Bulletin

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Section: Introductionsupporting

confidence: 53%

Numerical investigation of the moving liquid column coalescing with a droplet in triangular microchannels using CLSVOF method

Chen

Wang

et al. 2015

Science Bulletin

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“…In our previous study, it was found that at low laser powers, the photothermal effect of the IR laser mainly induced the evaporation–condensation–coalescence process and thus caused the interface advancement of the original liquid body, while at high laser powers, the formation of the liquid slug in front of the interface of the original liquid body due to the coalescence between the condensed droplets caused the original interface to move backward. Such distinct behaviors arose from the changes of the evaporation rate and condensed droplet growth rate as well as the coalescence behaviors under different laser powers.…”

Section: Resultsmentioning

confidence: 99%

“…These results were similar to the previously reported results. 23 This fact also indicates that the coalescence between the original liquid body and droplets is the main driving force to realize the mechanism of pumping the original body. 3.2.2.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 98%

“…Different from the low laser power heating, it was found that the condensed droplets would coalesce with each other to form a liquid slug in front of the original liquid body because of high evaporation and condensation rates resulting from the high laser power heating in our previous study. 23 After the formation of the liquid slug, the original liquid body would move back instead of the interface advancing. Clearly, the variation of the microchannel depth can also cause the change of the evaporation rate.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…Hence, the direct absorption of light energy without the addition of the photothermal conversion materials is a promising way to develop the photothermal effect based optofluidic systems. In our previous studies, 23 the IR laser photothermally induced condensation and meniscus evaporation were studied. One should note when the direct absorption of the laser energy is adopted, the depth of the microchannel becomes a crucial design parameter as it determines the absorption length of the laser.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of the IR Laser Photothermally Induced Phase Change in Microchannels with Different Depths

Chen

Zhu

et al. 2016

Ind. Eng. Chem. Res.

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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.

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Infrared laser-induced photothermal phase change for liquid actuation in microchannels

Chen

Zhu

et al. 2021

Microfluid Nanofluid

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IR laser assisted photothermal condensation in a microchannel

Cited by 11 publications

References 24 publications

Numerical investigation of the moving liquid column coalescing with a droplet in triangular microchannels using CLSVOF method

Numerical investigation of the moving liquid column coalescing with a droplet in triangular microchannels using CLSVOF method

Characteristics of the IR Laser Photothermally Induced Phase Change in Microchannels with Different Depths

Infrared laser-induced photothermal phase change for liquid actuation in microchannels

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