Abstract
Correlations for nucleate boiling heat transfer should be improved, or in the long term possibly be replaced, by the development of mechanistic simulations that include the non-uniform spacing and variable characteristics of the nucleation sites and non-linear interactions between the sites. This paper discusses the interactions that should be included in simulations and some lessons from a first attempt to validate a particular simulation against experimental spatio-temporal data for wall temperature. Input data for nucleation site positions and characteristics are a particular problem and the prospects for obtaining this data from measurements that are independent of boiling are discussed.
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Abbreviations
- D :
-
Bubble diameter (m)
- D o :
-
[σ/(ρL−ρG)g]0.5
- g :
-
Gravitational acceleration (m/s2)
- h :
-
Height of nucleus (m)
- H :
-
Cavity minimum depth (m)
- M :
-
Mass (kg)
- N :
-
Number of sites
- N/A :
-
Site density (m−2)
- p :
-
Pressure (Pa)
- p c :
-
Critical pressure (Pa)
- P5*:
-
Roughness parameter (m)
- q :
-
Heat flux (W/m2)
- R 1 :
-
Radius of primary bubble (m)
- R a :
-
Average surface roughness (m)
- S :
-
Site separation (m)
- t :
-
Time (s)
- t D :
-
Delay time (s)
- t G :
-
Growth time (s)
- t W :
-
Waiting time (s)
- x, y :
-
Spatial coordinates (m)
- β:
-
Cone half-angle (degree)
- ν:
-
Shape parameter
- θ:
-
Contact angle (degree)
- ρG :
-
Gas density (kg/m3)
- ρL :
-
Liquid density (kg/m3)
- σ:
-
Surface tension (N/m)
- σ2 :
-
Variance
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This paper is based in part on work funded by EPSRC Grant GR/M89034.
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Kenning, D., Golobič, I., Xing, H. et al. Mechanistic models for pool nucleate boiling heat transfer: input and validation. Heat Mass Transfer 42, 511–527 (2006). https://doi.org/10.1007/s00231-005-0648-3
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DOI: https://doi.org/10.1007/s00231-005-0648-3