Heat and Mass Transfer

, Volume 45, Issue 7, pp 945–950 | Cite as

Mass transport effect on the heat transfer coefficient during boiling of multicomponent mixture

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Abstract

In this work a simplified calculation method taking into account the effect of mass transport on the heat transfer coefficient (HTC) during boiling of multicomponent mixture has been elaborated. The calculation results were compared with own experimental data for ternary system methanol–isopropanol–water and Grigoriev data [1] (acetone–methanol–water). The experiments were performed in different hydrodynamic conditions such as: pool boiling and liquid evaporation at the free surface of the falling film. The experimental data covered wide range of heat fluxes from 6 to 30 kW/m2 in the case of liquid evaporation from the falling film and from 30 to 240 kW/m2 for pool boiling. The analysis of the results indicates that the mass transfer resistance in the liquid phase caused a significant reduction of experimental value HTC in comparison to so-called ideal HTC.

Keywords

Heat Flux Heat Transfer Coefficient Mass Transfer Coefficient Interfacial Temperature Multicomponent 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

Bo

boiling number = q/(mΔH)

Dj,k

binary diffusion coefficient (j,k) m2/s

Dk,k

diagonal diffusion coefficients in multicomponent mixture m2/s

Ej

rate factor (Eq. 5)

F

tube surface area m2

f

vapour bubbles surface m2

ΔH

molar latent heat of vaporization J/kmol

h

heat transfer coefficient W/(m2K)

i

number of bubbles

Kj

equilibrium constant of j-component

m

mass flux of liquid film kmol/(m2s)

n

number of mixture components

Nj

mass flux of j-component kmol/(m2s)

NT

total mass flux kmol/(m2s)

P

pressure Pa

q

heat flux W/m2

R

parameter defined by Eq. 13

T

temperature K

xj

mole fractions in liquid phase

yj

mole fractions in vapour phase

Greek symbols

βj

mass transfer coefficient of j component in multicomponent mixture kmol/(m2s)

γ

activity coefficient

ϕj

correction coefficient allowing for finite rates of mass transfer

Subscripts and superscripts

calc

calculated value

exp

experimental value

I

refers to interface

j

refers to j-th component

L

refers to liquid

S

saturated

W

wall

•

value corrected for finite mass fluxes

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Roman Krupiczka
    • 1
  • Adam Rotkegel
    • 1
  • Zenon Ziobrowski
    • 1
  1. 1.Institute of Chemical EngineeringPolish Academy of SciencesGliwicePoland

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