Heat and Mass Transfer

, 46:75 | Cite as

One dimensional numerical simulation for steady annular condensation flow in rectangular microchannels

  • Yongping ChenEmail author
  • Xin Li
  • Jiafeng Wu
  • Mingheng Shi


A one dimensional model for steady annular condensation flow in rectangular microchannels is developed and numerically solved under constant heat flux condition. The results indicate that the annular condensation length is determined by the contact angle, heat flux, vapor pressure, hydraulic diameter and aspect ratio of rectangular microchannels. A larger inlet vapor pressure and hydraulic diameter or a smaller heat flux and contact angle can all result in a longer annular condensation length. In addition, the simulation results of steady annular condensation flow in rectangular microchannels are compared with that in triangular microchannels. The differences in curvature radius, condensate pressure and velocity, vapor velocity distributions in rectangular and triangular microchannels under the same conditions verify the considerable influence of cross-section shape on micro flow condensation.


Contact Angle Hydraulic Diameter Annular Flow Condensation Heat Transfer Rectangular Microchannels 
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List of symbols


Area (m2)


Width of rectangular microchannels (m)


Depth of rectangular microchannels (m)


=1/4, see Eq. 14


Hydraulic diameter (m)


Friction factor


Latent heat (J kg−1)


Annular condensation length (m)


Length of the end part in condensation (m)


Mass flux (kg s−1)


Pressure (Pa)


Heat flux (W m−2)


Curvature radius (m)


Perimeter (m)


Velocity (m s−1)


Poiseuille number

Greek symbols


Half of right angle (°)


=min(a,b) see Eq. 22 (m)


Viscosity (kg m−1 s−1)


Contact angle (°)


Density (kg m−3)


Surface tension coefficient (N m−1)


Shear stress (N m−2)





Liquid–wall interface




Liquid–vapor interface





The authors gratefully acknowledge the support provided by National Natural Science Foundation of China (No. 50806012).


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Yongping Chen
    • 1
    Email author
  • Xin Li
    • 1
  • Jiafeng Wu
    • 1
  • Mingheng Shi
    • 1
  1. 1.School of Energy and EnvironmentSoutheast UniversityNanjingPeople’s Republic of China

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