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Heat and Mass Transfer

, Volume 45, Issue 7, pp 951–958 | Cite as

Heat transfer in pool boiling of binary and ternary non-azeotropic mixtures

  • Ziad NahraEmail author
  • Erling Næss
Special Issue

Abstract

Heat transfer coefficients in nucleate pool boiling of binary and ternary non-azeotropic hydrocarbon mixtures were obtained experimentally using a vertical electrically heated cylindrical carbon steel surface at atmospheric pressure with several surface roughness. The fluids used were Methanol/1-Pentanol and Methanol/1-Pentanol/1,2-Propandiol at constant 1,2-Propandiol mole fraction of 30%. Heat fluxes were varied in the range 25–235 kW/m2. The cylindrical heater surface was polished to an average surface roughness of 0.2 μm, and sandblasted yielding surface roughness of 2.98 and 4.35 μm, respectively. The experimental results were compared to available prediction correlations, indicating that the correlations based on the boiling range are in better qualitative agreement than correlations based on the phase envelope. Increasing surface roughness resulted in an increase in the heat transfer coefficient, and the effect was observed to be dependent on the heat flux and fluid composition.

Keywords

Heat Flux Surface Roughness Heat Transfer Coefficient Binary Mixture Ternary Mixture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

a

thermal diffusivity (m2/s)

A

area (m2)

b

exponent in Eq.13

C

constant

cp

heat capacity (J/kg K)

DAB

binary mass diffusivity (m2/s)

g

gravitational acceleration (m/s2)

Δhfg

latent heat of vaporization (J/kg)

n

exponent in Eq. 10

p

pressure (Pa)

q

heat flux (W/m2)

Q

heat duty (W)

Ra

integral surface roughness (m)

Rp

depth of the surface roughness (m)

Rw

Wall thermal resistance (mK/W)

T

temperature (K)

ΔTid

ideal wall-fluid temperature difference, (=q/α id ) (K)

ΔTdb

boiling range, i.e., dew-point-boiling point temperature difference (K)

\( \ifmmode\expandafter\tilde\else\expandafter\sim \fi{x} \)

molar concentration in liquid (–)

\( \ifmmode\expandafter\tilde\else\expandafter\sim \fi{y} \)

molar concentration in vapor (–)

α

Heat transfer coefficient (W/mK)

β

mass transfer coefficient (m/s)

θ

Heat transfer reduction parameter (–)

ρ

density (kg/m3)

μ

viscosity (Ns/m2)

σ

surface tension (N/m)

λ

thermal conductivity (W/m K)

Subscripts

0

reference state

cr

critical

exp

experimental

id

ideal

l

liquid

mix

mixture

pred

predicted

sat

saturated

v

vapor

w

wall

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Energy and Process EngineeringNorwegian University of Science and TechnologyTrondheimNorway

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