Experimental investigation of shear-driven water film flows on horizontal metal plate

Abstract

In this article, an experimental investigation has been conducted to characterize the instantaneous thickness of the surface water film driven by high-speed airflow pertinent to aerodynamic icing and anti-icing modeling. Non-intrusive results of the film flowing on a metal plate were obtained using the high-speed camera and confocal chromatic technique. The wind speed (Ua) ranges from 17.8 m/s to 52.2 m/s, and the film Reynolds number (Ref) ranges from 26 to 128. The effect of the high-speed airflow on the structure of the wave film was observed and analyzed qualitatively. A new correlation of the interfacial shear factor was proposed for the prediction of the average film thickness. The predictions were compared with the previous annular flow models by applying the dimensionless analysis method and a good agreement is achieved. The superficial roughness, characterized by root-mean-square of the thickness, was well-correlated using a piecewise linear function of the average film thickness. Furthermore, a comprehensive description of the superficial waves including spectrum analysis and division of film thickness data between underlying film and large waves was presented. Transformations of the wave frequency and amplitude with the wind speed and the film Reynolds number were also addressed.

Parametric analysis of interfacial friction factor for liquid film dynamics sheared by turbulent gas flow

“…( 14) for the pipe flow [16,17], assuming a small wave amplitude, and by Eq. ( 15) for the plate flow [27], obtained by the experiment on a flat plate, respectively.…”

Evaporation of Three-Dimensional Wavy Liquid Film Entrained by Turbulent Gas Flow

“…The distinct working liquid is ethanol and water, subjected to the fast air stream. Applied friction factors are = 0.080 −1/4 [30, 31] and = 0.07 [44] for the pipe flow and plate flow, respectively. Figure 3 presents time-averaged experimental results of film velocity and thickness plotted along the vertical axis, compared with analytical results in the horizontal axis derived from Eqs.…”

Experimental Research on the Influence of Roughness on Water Film Flow

“…Chang et al [18] analyzed the thickness and wavy characteristics of the water film by planar laser-induced fluorescence method. Leng et al [19] used a dispersion confocal displacement meter to record the time-domain signal of water film thickness for a period of time. A new interfacial shear coefficient correlation was proposed to predict the average thickness of the film.…”