%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 }