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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018016998
pages 423-435

PREDICTION OF NUCLEATE POOL BOILING ON HYDROPHILIC SURFACES BY CONSIDERING THE DYNAMIC CONTACT ANGLE EFFECT ON ISOLATED BUBBLE

Amir Mirza Gheitaghy
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16844, Iran
Hamid Saffari
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16844, Iran
Seyyed Sina Arshadi
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16844, Iran
Seyyede Shahrzad Tabatabaei
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16844, Iran

SINOPSIS

In this paper, an improved model for predicting nucleate pool boiling performance has been developed by considering the effect of dynamic contact angle on isolated bubble regime on hydrophilic surfaces. Visualization of nucleate pool boiling experiment revealed that the contact angle at the bubble base varies during the growth cycle. The modified model was proposed to account for the dynamic contact angle by calculating microlayer evaporation with respect to the change in the contact angle in initial and fi nal growth periods. Comparison of pool boiling curves based on the present model, considering the dynamic contact angle with the previous model considering the static contact angle and the existing experimental data, shows better prediction.


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