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Boiling heat transfer in a vertical tube with freon 114

Wärmeübergang beim Sieden in einem senkrechten Rohr mit R114

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Abstract

Test results for boiling heat transfer coefficients for R114 in vertical stainless tubes are reported both for upflow and downflow direction. Results are compared with different formulas given in the literature. A Recommendation of the numerical value ofC sf in Rohsenow's formula for fully developed nucleation boiling for R114/stainless steel combination is given.

Zusammenfassung

Experimentelle Ergebnisse für den Wärmeübergang beim Sieden für R114 in einem senkrechten Rohr aus rostfreiem Stahl sind sowohl für aufwärts — als abwärtsgerichtete Strömung gegeben. Die Ergebnisse sind mit verschiedenen Formeln in der Literatur verglichen. Eine Empfehlung für den numerischen Wert des KoeffizientenC 5f in der Gleichung von Rohsenow für voll ausgebildete Blasenverdampfung ist gegeben.

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Abbreviations

A :

surface area of pipe [m2]

P :

pressure in bar

i pg :

latent heat of vaporization [J/kg]

k f ork l :

conductivity of liquid [W/mk]

Cp :

specific heat [J/kg K]

ϱ g :

density of vapor [g/m3]

ϱ l orϱ f :

density of liquid [g/m3]

σ :

surface tension [N/m]

T s orT sat :

saturation temperature [K]

T wi :

internal wall temperature [K]

T l orT b :

liquid or bulk temperature

Q :

heat flux [W/m2]

Pr orPr l :

Prandtl number of liquid

η :

dynamic viscosity [kg/ms]

g :

gravitational acceleration [m/s2]

Re :

Reynold's number

Nu :

Nusselts number

α f :

thermal diffusivity [m2/s]

x :

vapor mass fraction

x tt :

Martinellis coefficient

G :

mass flux [kg/m2s]

h :

local heat transfer coefficient [W/m2K]

h TP :

two phase heat transfer coefficient [W/m2K]

m :

mass flow rate [kg/s]

m :

mass flux [kg/m2s]

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Authors and Affiliations

  1. Helsinki University of Technology, 02150, Espoo 15, Finland

    N. E. Fagerholm (Ass. Professor), A. R. Ghazanfari & K. Kivioja

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  1. N. E. Fagerholm
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  2. A. R. Ghazanfari
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  3. K. Kivioja
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Fagerholm, N.E., Ghazanfari, A.R. & Kivioja, K. Boiling heat transfer in a vertical tube with freon 114. Wärme- und Stoffübertragung 17, 221–232 (1983). https://doi.org/10.1007/BF01002367

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