Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/69577
標題: Pressure barrier in an axisymmetric capillary microchannel with sudden expansion
作者: Chen, J.M.
Chen, C.Y.
Liu, C.H.
關鍵字: surface tension;capillary valve;circular microchannel;microfluidics;pressure barrier;total analysis systems;circular microchannels;microvalve;flow
Project: Japanese Journal of Applied Physics
期刊/報告no:: Japanese Journal of Applied Physics, Volume 47, Issue 3, Page(s) 1683-1689.
摘要: 
In this paper, we present an analytical and experimental study of the pressure barrier developed in an axisymmetric microchannel with sudden expansion working as a capillary valve for regulating liquid flow for microfluidics. The analysis is based on the variation in the free energy of the liquid-solid-gas interfaces with liquid volume. The pressure barrier developed at the meniscus is obtained in a rather simple form valid for both hydrophilic and hydrophobic channel walls. The maximum pressure barrier, termed the burst pressure, for a capillary valve necessary to stop liquid flow is found to be a function of the channel geometry and liquid-channel interfacial properties. The analytical results are confirmed by flow visualization experiments in which the burst pressure and the growth of the meniscus are measured. The measurements were carried out for microchannels made of hydrophilic and hydrophobic materials with different diameters and expansion angles in combination with liquids having different interfacial properties.
URI: http://hdl.handle.net/11455/69577
ISSN: 0021-4922
DOI: 10.1143/jjap.47.1683
Appears in Collections:期刊論文

Show full item record
 

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.