Two-phase pressure drop of CO2 in mini tubes and microchannels

R. Yun, Y. Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)


Two-phase pressure drops of CO2 are investigated in mini tubes with inner diameters of 2.0 and 0.98 mm and in microchannels with hydraulic diameters from 1.08 to 1.54 mm. For the mini tubes, the tests were conducted with a variation of mass flux from 500 to 3570 kg/m2s, heat flux from 7 to 48 kW/m2, while maintaining saturation temperatures at 0°C, 5°C and 10°C. For the microchannels, mass flux was varied from 100 to 400 kg/m2s, and heat flux was altered from 5 to 20 kW/m 2. A direct heating method was used to provide heat into the refrigerants. The pressure drop of CO2 in mini tubes shows very similar trends with that in large diameter tubes. Although the microchannel has a small hydraulic diameter, two-phase effects on frictional pressure drop are significant. The Chisholm parameter of the Lockhart and Martinelli correlation is modified by considering diameter effects on the two-phase frictional multiplier.

Original languageEnglish
Title of host publicationInternational Conference on Microchannels and Minichannels
PublisherAmerican Society of Mechanical Engineers
Number of pages5
ISBN (Print)0791836673, 9780791836675
Publication statusPublished - 2003
EventFirst International Conference on Microchannels and Minichannels - Rochester, NY, United States
Duration: 2003 Apr 242003 Apr 25

Publication series

NameInternational Conference on Microchannels and Minichannels


OtherFirst International Conference on Microchannels and Minichannels
Country/TerritoryUnited States
CityRochester, NY

ASJC Scopus subject areas

  • Engineering(all)


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