Regularities of liquid film flow on vertical surface
2004
Sinkunas, S.(Kaunas Univ. of Technology (Lithuania). Faculty of Mechanical Engineering. Dept. of Thermal and Nuclear Energy)E-mail:[email protected] | Gylys, J.(Kaunas Univ. of Technology (Lithuania). Faculty of Mechanical Engineering. Dept. of Thermal and Nuclear Energy)E-mail:[email protected] | Gimbutyte, I.(Kaunas Univ. of Technology (Lithuania). Faculty of Mechanical Engineering. Dept. of Thermal and Nuclear Energy)E-mail:[email protected] | Kiela, A.(Kaunas College (Lithuania). Faculty of Technology)E-mail:[email protected]
A simple model of liquid film on a vertical surface with cross curvature based on force equilibrium equations is presented in the paper. Theoretical presumptions concerned with variation of shear stress in the gravitational laminar film are discussed. The variation dependence of the shear stress in the film upon the different cross curvature values is shown in the study. Experimental investigation of the heat transfer in the entrance region for turbulent film was carried out as well. The experiments were performed in water film flowing down a surface of vertical tubes. The experimental results of local heat transfer variation in the entrance region of the film flow down a vertical surface are discussed in the paper. The dependence of local heat transfer coefficient upon the Reynolds number and initial velocity of the film was established.
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