Title :
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
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;
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
DOI :
10.1109/NEMS.2012.6196857
