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The influence of surface roughness and solution concentration on pool boiling process in Diethanolamine aqueous solution

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Abstract

In this research, the effect of surface roughness and concentration of solution on bubble departing frequency and nucleation site density for pool boiling of water/diethanolamine (DEA) binary solution were investigated experimentally. In this investigation, boiling heat transfer coefficient, bubble departing frequency and nucleation site density have been experimentally investigated in various concentrations and heat fluxes. Microstructured surfaces with a wide range of well-defined surface roughness were fabricated, and a heat flux between 1.5–86 kW/m2 was achieved under atmospheric conditions. The Results indicated that surface roughness and concentration of solution increase the bubble departing frequency and nucleation site density with increasing heat flux. The boiling heat transfer coefficient in mixtures of water/DEA increases with increasing concentration of DEA in water. The experimental results were compared with predictions of several used correlations in the literatures. Results showed that the boiling heat transfer coefficients of this case study are much higher than the predicted values by major existing correlations and models. The excellent agreement for bubble departing frequency found between the models of Jackob and Fritz (1966) and experimental data and also the nucleation site density were in close agreement with the model of Paul (1983) data. f bubble departure frequency, 1/s or Hz N Number of nucleation sites per area per time Rc Minimum cavity size, m Dc critical diameter, m g gravitational acceleration, m/s2 ρ density, kg/m3 T temperature, °c ΔT temperature difference, °c dd vapor bubble diameter, m hfg enthalpy of vaporization, J/kg R Roughness, μm Ja Jakob number cp specific heat, J/kg °c Pr Prandtl number Ar Archimedes number h Heat transfer coefficient, J/(m2 °c) tg time it takes to grow a bubble, s q/A heat flux (kW/m2) tw time required to heat the layer, s gc Correction coefficient of incompatible units Ra Surface roughness A heated surface area d departure ONB onset of nucleate boiling w surface wall s saturation v vapor l liquid θ groove angle (o) γ influence parameter of heating surface material σ surface tension, N/m.

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Acknowledgments

The authors of the article are grateful for the efforts of Dr. Seyyed Ali Alavi Fazel, who have always been guided by their guidance.

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Authors and Affiliations

  1. Department of Chemical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Mohsen Khoshechin & Farhad Salimi

  2. Faculty of Engineering, Shahrekord University, Shahrekord, Iran

    Alireza Jahangiri

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  1. Mohsen Khoshechin
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  2. Farhad Salimi
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  3. Alireza Jahangiri
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Correspondence to Farhad Salimi.

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Khoshechin, M., Salimi, F. & Jahangiri, A. The influence of surface roughness and solution concentration on pool boiling process in Diethanolamine aqueous solution. Heat Mass Transfer 54, 2963–2973 (2018). https://doi.org/10.1007/s00231-018-2340-4

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