A visualization study of venting gas via hydrophobic nanoporous membrane

Author

Jin-Cherng Shyu ; Dai, Sin-Min ; Yang, Kai-Shing ; Wang, Chi-Chuan

Author_Institution

Dept. of Mech. Eng., Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung, Taiwan

fYear

2012

fDate

5-8 March 2012

Firstpage

640

Lastpage

643

Abstract

This study examines the venting gas characteristics in a microchannel through a hydrophobic nanoporous membrane with a pore size of 0.22 μm and a porosity of 70%. A total of three microchannels were made and tested, including a serpentine, a parallel and a contraction-expansion configuration. The mass flux (G) is 5, 7.5 and 10 kg/m²s with the quality (x) ranging from 0 to 0.1. Flow visualization is also performed to observe the bubbles movement under different experimental conditions. The tested results show that the amount of venting gas is strongly related to the contact time and configuration of gas slug and the development of flow pattern in the channel.

Keywords

bubbles; flow through porous media; flow visualisation; hydrophobicity; membranes; microchannel flow; multiphase flow; nanoporous materials; porosity; bubbles movement; contact time; contraction-expansion configuration; flow pattern; flow visualization; gas slug; hydrophobic nanoporous membrane; mass flux; microchannel; pore size; porosity; serpentine; size 0.22 mum; venting gas; Atmospheric measurements; Microchannel; Particle measurements; Visualization; hydrophobic; microchannel; nanoporous membrane; two phase flow; venting gas;

fLanguage

English

Publisher

ieee

Conference_Titel

Nano/Micro Engineered and Molecular Systems (NEMS), 2012 7th IEEE International Conference on

Conference_Location

Kyoto

Print_ISBN

978-1-4673-1122-9

Type

conf

DOI

10.1109/NEMS.2012.6196857

Filename

6196857