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Compositive effects of orientation and contact angle on critical heat flux in pool boiling of water

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Abstract

An experimental study was carried out to investigate the effects of heat transfer surface orientation and the solid–liquid contact angle on the boiling heat transfer and critical heat flux (CHF) in water pool boiling using a smooth heat-transfer surface under atmospheric pressure. The orientation angle was ranged from 0° (up-facing horizontal position) to 180° (down-facing horizontal position) with a pace of 45°. The three kinds of heat transfer surfaces having different solid–liquid contact angles were the normal surface with a contact angle of 55°, the hydrophilic surface with a contact angle of 30° and the superhydrophilic surface with a contact angle of 0°. The experimental results indicate that orientation and contact angle have complex, coupling effects on heat transfer and CHF. A predicting correlation for the CHF which takes the effects of both orientation and contact angle into account is established. The predicting correlation agrees reasonably well with the experimental data.

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Abbreviations

Q :

heat flux (w/m2)

ΔT :

temperature difference (K)

h :

heat transfer coefficient [W/(m2 K)]

g :

gravity (m/s2)

h fg :

latent heat evaporation (J/kg)

p :

pressure (Pa)

q m :

critical heat flux (w/m2)

q m,Z :

the CHF on the horizontal upward metal surface by the correlation of Zuber (Eq. 3) (w/m2)

ΔT sat :

superheat of heat transfer surface (K)

r :

standard roughness (μm)

λ :

thermal conductivity [w/(mK)]

δ :

thickness (m)

σ :

surface tension (N/m)

ν :

kinematics viscosity (m2/s)

θ :

orientation (degree)

β :

solid–liquid contact angle (degree)

ρ :

density (kg/m3)

ε :

average thickness of vapor layer (m)

l :

liquid

g :

vapor

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Acknowledgment

Special thanks are given to the instrument analysis center of Shanghai Jiaotong University for roughness measurement in this research.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China

    Liang Liao, Ran Bao & ZhenHua Liu

Authors
  1. Liang Liao
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  2. Ran Bao
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  3. ZhenHua Liu
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Correspondence to ZhenHua Liu.

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Liao, L., Bao, R. & Liu, Z. Compositive effects of orientation and contact angle on critical heat flux in pool boiling of water. Heat Mass Transfer 44, 1447–1453 (2008). https://doi.org/10.1007/s00231-008-0384-6

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  • DOI: https://doi.org/10.1007/s00231-008-0384-6

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