New prediction methods for CO2 evaporation inside tubes

Part II - An updated general flow boiling heat transfer model based on flow patterns

Lixin Cheng, Gherhardt Ribatski, John R. Thome

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

Corresponding to the updated flow pattern map presented in Part I of this study, an updated general flow pattern based flow boiling heat transfer model was developed for CO2 using the Cheng–Ribatski–Wojtan–Thome [L. Cheng, G. Ribatski, L. Wojtan, J.R. Thome, New flow boiling heat transfer model and flow pattern map for carbon dioxide evaporating inside horizontal tubes, Int. J. Heat Mass Transfer 49 (2006) 4082–4094; L. Cheng, G. Ribatski, L. Wojtan, J.R. Thome, Erratum to: “New flow boiling heat transfer model and flow pattern map for carbon dioxide evaporating inside tubes” [Heat Mass Transfer 49 (21–22) (2006) 4082–4094], Int. J. Heat Mass Transfer 50 (2007) 391] flow boiling heat transfer model as the starting basis. The flow boiling heat transfer correlation in the dryout region was updated. In addition, a new mist flow heat transfer correlation for CO2 was developed based on the CO2 data and a heat transfer method for bubbly flow was proposed for completeness sake. The updated general flow boiling heat transfer model for CO2 covers all flow regimes and is applicable to a wider range of conditions for horizontal tubes: tube diameters from 0.6 to 10 mm, mass velocities from 50 to 1500 kg/m2 s, heat fluxes from 1.8 to 46 kW/m2 and saturation temperatures from -28 to 25 °C (reduced pressures from 0.21 to 0.87). The updated general flow boiling heat transfer model was compared to a new experimental database which contains 1124 data points (790 more than that in the previous model [Cheng et al., 2006, 2007]) in this study. Good agreement between the predicted and experimental data was found in general with 71.4% of the entire database and 83.2% of the database without the dryout and mist flow data predicted within ±30%. However, the predictions for the dryout and mist flow regions were less satisfactory due to the limited number of data points, the higher inaccuracy in such data, scatter in some data sets ranging up to 40%, significant discrepancies from one experimental study to another and the difficulties associated with predicting the inception and completion of dryout around the perimeter of the horizontal tubes.
Original languageEnglish
Pages (from-to)125-135
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume51
Issue number1-2
Early online date4 Jun 2007
DOIs
Publication statusPublished - Jan 2008

Fingerprint

boiling
Flow patterns
Boiling liquids
flow distribution
Evaporation
heat transfer
evaporation
tubes
Heat transfer
predictions
Fog
mist
Mass transfer
mass transfer
Carbon Dioxide
Carbon dioxide
heat
carbon dioxide
Heat flux
completeness

Keywords

  • model
  • flow patterns
  • flow boiling
  • heat transfer
  • macrochannel
  • microchannel
  • CO2

Cite this

New prediction methods for CO2 evaporation inside tubes : Part II - An updated general flow boiling heat transfer model based on flow patterns. / Cheng, Lixin; Ribatski, Gherhardt; Thome, John R.

In: International Journal of Heat and Mass Transfer, Vol. 51, No. 1-2, 01.2008, p. 125-135.

Research output: Contribution to journalArticle

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