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Effects of vapor pressure/velocity and concentration on condensation heat transfer for steam–ethanol vapor mixture

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Abstract

When a steam–ethanol vapor mixture condenses on a vertical flat plate, the form of the condensate film changes and many drops are created. This non-film condensation is called pseudo-dropwise or Marangoni condensation. This paper aims to study the main influencing factors on the Marangoni condensation of steam–ethanol vapor.The factors include the ethanol concentration, vapor pressure, vapor velocity and vapor-to-surface temperature difference. The experiments show that the heat transfer coefficient has a maximum value of approximately 42 kW/m2 K when the ethanol concentration is 1%. At the low concentrations of 0.5, 1, 5.1 and 9.8%, the condensation heat transfer is greater than for pure steam. In addition, the heat transfer for all vapor mixtures increases with both the rise of vapor pressure and vapor velocity.

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Abbreviations

A :

area (m2)

c :

ethanol mass fraction (mass %)

F :

enhancement ratio of heat transfer

h :

heat transfer coefficient (kW/m2  K)

M :

molar mass (kg/mol)

\({{\mathop M\limits^ \bullet}}\) :

mass flow rate (kg/s)

\({{\mathop {M_{\rm V}}\limits^ \bullet}}\) :

mass flow rate of vapor \({{\mathop M\limits^ \bullet}_{\rm V} = v A_{{\sec}} \rho _{V}}\)

\({{\mathop {M_{\rm L}}\limits^ \bullet}}\) :

mass flow rate of liquid \({{\mathop M \limits^ \bullet}_{{\rm L}} = q A_{{\rm sur}} /r}\)

P :

pressure (kPa)

q :

heat flux (kW/m2)

r :

latent heat (kJ/kg)

R :

thermal resistance (m2  K/kW)

T :

temperature (K)

\({{\mathop {T_{\rm {L}}}\limits^{\_\_}}}\) :

average temperature of condensation liquid \({{\mathop {T_{\rm {L}}}\limits^{\_\_}} = (T_{\rm {V}} + T_{\rm {{sur}}})/2}\)

v :

velocity (m/s)

x :

liquid mole fraction

y :

vapor mole fraction

δ:

thickness of block and distance between two thermocouples in block (m)

λ:

heat conductivity (kW/mK)

ν:

kinematic viscosity (m2/s)

ρ:

density (kg/m3)

ρV mix :

density of vapor mixture ρ mixV =  ρ eV c + ρ sV (1 − c)

σ:

surface tension, interfacial tension (N/m)

avg:

average

diff:

diffusion layer

e:

ethanol

w:

water

V:

vapor

L:

liquid

sur:

surface

i:

interfacial

mix:

mixture

sat:

saturation

sec:

cross section

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Acknowldgments

This project has been supported by National Natural Science Foundation of China through grants No.50476048 and No.50323001.

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Junjie Yan, Yusen Yang, Shenhua Hu , Kejian Zhen & Jiping Liu

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  1. Junjie Yan
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  2. Yusen Yang
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  3. Shenhua Hu
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  4. Kejian Zhen
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  5. Jiping Liu
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Correspondence to Junjie Yan.

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Yan, J., Yang, Y., Hu , S. et al. Effects of vapor pressure/velocity and concentration on condensation heat transfer for steam–ethanol vapor mixture. Heat Mass Transfer 44, 51–60 (2007). https://doi.org/10.1007/s00231-006-0216-5

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