Gas–liquid two-phase flow in microchannels with hydraulic diameters of 100–500μm exhibits drastically different flow behaviors from its counterpart in conventional macroscopic channels. Of particular interests are the two-phase flow patterns and the two-phase frictional pressure drop for given flow conditions in these microchannels. This paper presents an experimental study of the effects of channel size and superficial phasic velocity on the two-phase flow pattern and pressure drop of air–water mixture in circular microchannels with inner diameters of 100, 180 and 324μm. Two-phase flow patterns were visualized using high-speed photographic technique. Four basic flow patterns, namely, bubbly flow, slug flow, ring flow and annular flow, were observed. The two-phase flow regime maps were constructed and the transition boundaries between different flow regimes identified. In an effort to unify the flow transition boundary in microchannels of different sizes, a new flow map was developed using the modified Weber numbers as the coordinates. The two-phase frictional pressure gradient in the microchannels was measured and the data were compared with predictions from the separated flow model, the homogeneous flow model and the flow pattern-based phenomenological models. Results show that the flow pattern-based models provide the best prediction of the two-phase pressure drop in the microchannels.
%0 Journal Article
%1 sur2012adiabatic
%A Sur, Aritra
%A Liu, Dong
%D 2012
%J International Journal of Thermal Sciences
%K 76t10-liquid-gas-two-phase-flows-bubbly-flows
%P 18-34
%R 10.1016/j.ijthermalsci.2011.09.021
%T Adiabatic air–water two-phase flow in circular microchannels
%U https://www.sciencedirect.com/science/article/pii/S1290072911002900
%V 53
%X Gas–liquid two-phase flow in microchannels with hydraulic diameters of 100–500μm exhibits drastically different flow behaviors from its counterpart in conventional macroscopic channels. Of particular interests are the two-phase flow patterns and the two-phase frictional pressure drop for given flow conditions in these microchannels. This paper presents an experimental study of the effects of channel size and superficial phasic velocity on the two-phase flow pattern and pressure drop of air–water mixture in circular microchannels with inner diameters of 100, 180 and 324μm. Two-phase flow patterns were visualized using high-speed photographic technique. Four basic flow patterns, namely, bubbly flow, slug flow, ring flow and annular flow, were observed. The two-phase flow regime maps were constructed and the transition boundaries between different flow regimes identified. In an effort to unify the flow transition boundary in microchannels of different sizes, a new flow map was developed using the modified Weber numbers as the coordinates. The two-phase frictional pressure gradient in the microchannels was measured and the data were compared with predictions from the separated flow model, the homogeneous flow model and the flow pattern-based phenomenological models. Results show that the flow pattern-based models provide the best prediction of the two-phase pressure drop in the microchannels.
@article{sur2012adiabatic,
abstract = {Gas–liquid two-phase flow in microchannels with hydraulic diameters of 100–500μm exhibits drastically different flow behaviors from its counterpart in conventional macroscopic channels. Of particular interests are the two-phase flow patterns and the two-phase frictional pressure drop for given flow conditions in these microchannels. This paper presents an experimental study of the effects of channel size and superficial phasic velocity on the two-phase flow pattern and pressure drop of air–water mixture in circular microchannels with inner diameters of 100, 180 and 324μm. Two-phase flow patterns were visualized using high-speed photographic technique. Four basic flow patterns, namely, bubbly flow, slug flow, ring flow and annular flow, were observed. The two-phase flow regime maps were constructed and the transition boundaries between different flow regimes identified. In an effort to unify the flow transition boundary in microchannels of different sizes, a new flow map was developed using the modified Weber numbers as the coordinates. The two-phase frictional pressure gradient in the microchannels was measured and the data were compared with predictions from the separated flow model, the homogeneous flow model and the flow pattern-based phenomenological models. Results show that the flow pattern-based models provide the best prediction of the two-phase pressure drop in the microchannels.},
added-at = {2024-03-08T05:15:22.000+0100},
author = {Sur, Aritra and Liu, Dong},
biburl = {https://www.bibsonomy.org/bibtex/22f265d76b444140f8255df674472580b/gdmcbain},
doi = {10.1016/j.ijthermalsci.2011.09.021},
interhash = {c3aeb0580ae45bc594af94288eb72c64},
intrahash = {2f265d76b444140f8255df674472580b},
issn = {1290-0729},
journal = {International Journal of Thermal Sciences},
keywords = {76t10-liquid-gas-two-phase-flows-bubbly-flows},
pages = {18-34},
timestamp = {2024-03-08T05:15:22.000+0100},
title = {Adiabatic air–water two-phase flow in circular microchannels},
url = {https://www.sciencedirect.com/science/article/pii/S1290072911002900},
volume = 53,
year = 2012
}