Flow patterns and mode transitions for falling-films on flat tubes.

Number: pap. n. R28, 2461

Author(s) : WANG X., HRNJAK P. S., ELBEL S., et al.

Summary

The transitional Reynolds numbers for different patterns are available and a proposed transitional map is also provided in this paper. The transition of falling-films on flat tubes is studied in this work. Water and ethylene glycol are used as working fluids, for falling-film experiments conducted under adiabatic conditions, without an imposed vapor flow. The flow patterns are recorded using a high-speed, digital camera over a range of flow rate and tube spacing. The flow patterns are similar to those on round tubes, including sheet, sheet-jet, jet, jet-droplet and droplet flows, but the transitions for ethylene glycol are different–there is no sheet-jet pattern during transition between the sheet and jet flow patterns. The transition threshold increases with tube spacing and the effect of distributor height depends on flow patterns. The transitional Reynolds numbers for different patterns are available and a proposed transitional map is also provided in this paper.

Available documents

Format PDF

Pages: 8 p.

Available

  • Public price

    20 €

  • Member price*

    15 €

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Flow patterns and mode transitions for falling-films on flat tubes.
  • Record ID : 30001001
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

Links


See other articles from the proceedings (121)
See the conference proceedings