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Nucleate boiling of FC-87/FC-72 zeotropic mixtures on a horizontal copper disc

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Abstract

This paper presents nucleate boiling experimental results, at atmospheric pressure, for heat fluxes q ≤ 40 kW/m2, for FC-87/FC-72 binary mixtures in molar fractions of 0/100, 25/75, 50/50, 75/25, 85/15 and 100/0, at saturation temperatures for pure fluids and bubble points for mixtures. The test section was an upward facing copper disc of 12 mm diameter and 1 mm thickness. The experimental heat transfer coefficient was compared with the correlations of Rohsenow (1952), as reported by Rohsenow et al. (Handbook of heat transfer, McGraw-Hill, New York, 1998), Stephan and Abdelsalam (Int J Heat Mass Transfer 23;73–78, 1978) and Cooper (Int Chem Eng Symp Ser 86:785–792, 1984) for pure fluids and the semi-empirical models of Stephan and Körner (Chem Ing Tech Jahrg 7:409–484, 1969), Thome (J Heat Transfer 104:474–478, 1982), Fujita et al. (1996), as reported by Rohsenow et al. (Handbook of heat transfer, McGraw-Hill, New York, 1998), Fujita and Tsutsui (Int J Heat Mass Transfer 37(1):291–302, 1994) and Calus and Leonidopoulos (Int J Heat Mass Transfer 17:249–256, 1973) for mixtures.

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Abbreviations

c pl :

liquid specific heat (J/kgK)

C sf :

constant in Rohsenow correlation

D :

mass diffusivity (m2/s)

d b :

departure bubble diameter (m)

g :

acceleration due to gravity (m/s2)

h :

heat transfer coefficient (kW/m2 K)

h lv :

latent heat of vaporization (J/kg)

K :

correction factor

k l :

liquid thermal conductivity (W/mK)

M :

molecular weight (kg/kmol)

p :

pressure (N/m2)

p r :

reduced pressure

Pr :

Prandtl number

q :

heat flux (kW/m2)

R a :

surface roughness (μm)

T :

temperature (K, °C)

x :

liquid molar fraction of the more volatile component

y :

vapor molar fraction of the more volatile component

ΔT si :

i = 1, 2, wall superheating for pure fluids (K)

ΔT :

temperature difference (K)

ΔT db :

temperature difference between the dew point and the bubble point (K)

θ :

contact angle (°)

μ :

dynamic viscosity (Pa s)

ρ :

density (kg/m3)

σ :

surface tension (J/m2)

bp:

bubble point

C:

Cooper

db:

the dew point minus the bubble point

id:

ideal

l:

liquid

R:

Rohsenow

SA:

Stephan–Abdelsalam

sat:

saturation

th:

theoretical

v:

vapor

w:

wall

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Acknowledgments

The authors are grateful for the support of CAPES and CNPq Brazilian Agencies in the performance of this study and to Mr. E. L. Silva for his important contribution to the laboratory work.

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Authors and Affiliations

  1. Departamento de Engenharia Mecânica, LEPTEN/Boiling, Laboratórios de Engenharia de Processos e Tecnologia de Energia, Boiling Group EMC, Universidade Federal de Santa Catarina, Caixa Postal 476, Florianópolis, SC, CEP 88040-900, Brazil

    A. R. Schlindwein, F. O. Martin Jr & J. C. Passos

  2. Dipartimento di Ingegneria della Produzione, Termoenergetica e Modelli Matematici, Via All’Opera Pia, 15-a, 16145, Genoa, Italy

    M. Misale

Authors
  1. A. R. Schlindwein
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  2. F. O. Martin Jr
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  3. M. Misale
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  4. J. C. Passos
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Correspondence to J. C. Passos.

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Schlindwein, A.R., Martin, F.O., Misale, M. et al. Nucleate boiling of FC-87/FC-72 zeotropic mixtures on a horizontal copper disc. Heat Mass Transfer 45, 937–944 (2009). https://doi.org/10.1007/s00231-008-0404-6

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