Abstract
A film boiling heat transfer model is developed for cryogenic chilldown at low mass flux inside a horizontal pipeline. It incorporates the stratified flow structure and is based on conservation principles of mass, momentum, and energy. Simplifying assumptions lead to an expression for the local film boiling heat transfer coefficient which varies with the azimuthal angle. The efficacy of the model is assessed by comparing the predicted wall temperature histories with those measured at several azimuthal positions and various mass fluxes. Good agreement is observed at low flux, G = 13–54 kg/m2 s.
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Abbreviations
- Bo:
-
boiling number
- c p :
-
heat capacity (J/kg K)
- D :
-
pipe diameter (m)
- d :
-
thickness of pipe wall (m)
- G :
-
mass flux (kg/m2 s)
- g :
-
gravity (m/s2)
- h :
-
heat transfer coefficient (W/m2 K)
- h fg :
-
latent heat (J/kg)
- Ja:
-
Jakob number
- k :
-
thermal conductivity (W/m K)
- Nu:
-
Nusselt number
- p :
-
pressure (Pa)
- R :
-
radius of pipe (m)
- Ra:
-
Rayleigh number
- Re :
-
Reynolds number
- T :
-
temperature (K)
- T w :
-
wall temperature (K)
- t :
-
time (s)
- U :
-
velocity (m/s)
- u and v :
-
vapor film velocity (m/s)
- x and y :
-
vapor film coordinates
- z, r, and ϕ:
-
cylindrical coordinates
- αv :
-
vapor thermal diffusivity (m2/s)
- αl :
-
liquid volume fraction
- δ:
-
vapor film thickness (m)
- χtt :
-
Martinelli parameter
- ν:
-
kinematic viscosity (m2/s)
- ρ:
-
density (kg/m3)
- v:
-
vapor
- sat:
-
saturated
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Acknowledgements
This work was supported by NASA Glenn Research Center under contract NAG3-2930 and NASA Kennedy Space Center. The authors wish to thank Professor Jacob N. Chung and PhD student Kun Yuan at the University of Florida for many useful discussions.
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Liao, J., Mei, R. & Klausner, J.F. A film boiling model for cryogenic chilldown at low mass flux inside a horizontal pipeline. Heat Mass Transfer 42, 891–900 (2006). https://doi.org/10.1007/s00231-006-0143-5
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DOI: https://doi.org/10.1007/s00231-006-0143-5