The numerical computation of the evaporative cooling of falling water film in turbulent mixed convection inside a vertical tube

• Published in: International communications in heat and mass transfer 2006-08, Vol.33 (7), p.917-927
• Main Authors: Feddaoui, M., Meftah, H., Mir, A.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bouyancy forces; Energy; Energy. Thermal use of fuels; Evaporative cooling; Exact sciences and technology; Heat and mass transfer; Heat transfer; Theoretical studies. Data and constants. Metering; Turbulent mixed convection
• ISSN: 0735-1933; 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2006.04.004

An analysis has been developed for studying the evaporative cooling of liquid film falling inside a vertical insulated tube in turbulent gas stream is presented. Heat and mass transfer characteristics in air–water system are mainly considered. A low Reynolds number turbulence model of Launder and Sharma is used to simulate the turbulent gas stream and a modified Van Driest model suggested by Yih and Liu is adopted to simulate the turbulent liquid film. The model predictions are first compared with available experimental data for the purpose of validating the model. Parametric computations were performed to investigate the effects of Reynolds number, inlet liquid temperature and inlet liquid mass flow rate on the liquid film cooling mechanism. Results show that significant liquid cooling results for the system with a higher gas flow Reynolds number Re, a lower liquid flow rate Γ 0 or a higher inlet liquid temperature T L0.