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CSME 2025/04
Volume 46 No.2
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174-183
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Numerical Simulation of Sub cooled Boiling Flow in Vertical and in Inclined Pipes.
Mohamed A.Elhelw a, Mohamed A.Teamah b, Osama A.Elmasri c and Mohamed A.Elnakeeb d
aPhD Student, Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria – Egypt 21544, ROC.
bProfessor, Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria – Egypt 21544, ROC.
cProfessor, Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria – Egypt 21544, ROC.
dProfessor Assistant, Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria – Egypt 21544, ROC. – Egypt 21913, ROC.Pingtung, Taiwan 91207, ROC.
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Abstract:
The primary goal of this work is to thoroughly examine the sub cooled boiling phenomena in inclined and vertical pipes. The continuity, momentum, and energy equations for each phase serve as the foundation for the mathematical model. For the conditions of critical heat flux connected to Eulerian two fluid model, the modified RPI model was employed. With the aid of CFD software, ANSYS FLUENT R2021, the mathematical model was resolved. The findings, which include axial profiles of the vapor volume fraction and liquid temperature, are in good agreement with the experimental data. As a result of the sharp variations in density, the effects of orientations on heat dissipation have been investigated. Using water as a working fluid at high pressure in flow boiling for vertical, inclined 45° , and horizontal orientations, the volume fraction, liquid temperature, heat transfer coefficient, and pressure drop are examined. The distribution of vapor volume fraction in the pipe, which affects wall temperature are more significantly impacted by the pipe inclination angle. In cases of horizontal and 45° angled flow, the distribution of vapor volume is asymmetric, whereas in vertical orientation, they are symmetric. Additionally, as the inclination angle is decreased, the top wall line's and bottom wall line's temperature gradients rise, reaching its maximum in the horizontal direction.
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Keywords: Wall heat flux partitioning RPI Model, Pipe inclination, Sub cooled Boiling.
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*Corresponding author; e-mail:
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©
2025
CSME , ISSN 0257-9731
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