| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Static Threshold Pressure Gradient Characteristics of Liquid Influenced by Boundary Wettability |
| SONG Fu-Quan, WANG Jian-Dong, LIU Hai-Li |
| Department of Physics, Zhejiang Normal University, Jinhua 321004 |
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| Cite this article: |
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SONG Fu-Quan, WANG Jian-Dong, LIU Hai-Li 2010 Chin. Phys. Lett. 27 024704 |
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Abstract We propose an experimental setup to measure the threshold pressure gradient (TPG) of microchannels with different wettability surfaces by the static method in microchannels with diameters from 20 μm to 320 μm, and compare the TPG of microchannels with adsorption of cetyl trimethyl ammonium bromide (CTAB) with that without CTAB adsorption. The results show the existence of TPG in microchannels. The TPG of microchannels increases with decreasing hydrodynamic diameter, and the relation between TPG and diameter is in agreement with the single-log normalization. The TPG of a microchannel with CTAB adsorption decreases obviously as compared with the microchannel without CTAB adsorption. The TPG of microchannels with different wettabilities of boundary surface are different, and the resistance of liquid flow can be reduced by changing the wettability of boundary surfaces.
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| Keywords:
47.15.Rq
47.15.Cb
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Received: 18 May 2009
Published: 08 February 2010
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| PACS: |
47.15.Rq
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(Laminar flows in cavities, channels, ducts, and conduits)
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47.15.Cb
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(Laminar boundary layers)
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