Summary
The existed flow pattern map of flow boiling are mainly developed for horizontal smooth tubes, which are not suitable for predicting the flow patterns in micro-finned tubes. This paper presents an improved flow pattern map for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. Visualization of R410A flow boiling was carried out through the transparent smooth and micro-finned tubes with 0°, 10° and 18° helix angle. The result shows that the flow pattern map for micro-finned tube with 0° helix angle is generally similar to that in the smooth tube. For the tube with 10° and 18° helix angle, the annular flow occurs at lower vapor quality and lower mass flux. A modified model accounting for the early transition to annular flow in the micro-finned tubes is built.
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Details
- Original title: Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle.
- Record ID : 30026045
- Languages: English
- Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
- Publication date: 2019/08/24
- DOI: http://dx.doi.org/10.18462/iir.icr.2019.0857
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