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A comparison of predictive models for the onset of significant void at low pressures in forced-convection subcooled boiling

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Abstract

The predictive models for the onset of significant void (OSV) in forced-convection subcooled boiling are reviewed and compared with extensive data. Three analytical models and seven empirical correlations are considered in this paper. These models and correlations are put onto a common basis and are compared, again on a common basis, with a variety of data. The evaluation of their range of validity and applicability under various operating conditions are discussed. The results show that the correlations of Saha-Zuber (1974) seems to be the best model to predict OSV in vertical subcooled boiling flow.

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Abbreviations

C pf :

Specific heat

D :

Tube diameter

D b :

Bubble departure diameter

D k :

Tube hydraulic diameter

D f :

Inner diameter

D o :

Outer diameter

f :

Friction factor

G :

Mass velocity

g :

Acceleration due to gravity

h :

Heat transfer coefficient

h fg :

Latent heat of vaporization

h fs :

Liquid saturation enthalpy

h t :

Subcooled boiling liquid phase heat transfer coefficient

k f :

Thermal conductivity

N :

The number of data

N u :

Nusselt number

p :

Pressure

Pc:

Peclet number

Pr:

Prandtl number

q″:

Heat flux

Re:

Reynolds number

T J, osv :

Fluid temperature at OSV

T f :

Fluid temperature

T f, in :

Inlet fluid temperature

T sm :

Saturation temperature

ΔT osv :

Degree of subcooling at OSV,T sat −T f,osv

V f :

Fluid velocity

Y b :

Dimensionless distance from the wall to the bubble tip

θ:

Contact angle

μ f :

Fluid viscosity

σ a :

Standard deviation

ρ f :

Fluid density

σ:

Surface tension

τ w :

Wall shear stress

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Authors and Affiliations

  1. School of Mechanical Engineering, Yeungnam Univ., 214-1, Daedong, 712-749, Gyungsan, Korea

    S. C. Lee

  2. Department of Chemical Engineering, Northwestern Univ., 60208-3120, Evanston, IL, U.S.A.

    S. G. Bankoff

Authors
  1. S. C. Lee
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  2. S. G. Bankoff
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Lee, S.C., Bankoff, S.G. A comparison of predictive models for the onset of significant void at low pressures in forced-convection subcooled boiling. KSME International Journal 12, 504–513 (1998). https://doi.org/10.1007/BF02946366

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  • DOI: https://doi.org/10.1007/BF02946366

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