Abstract
The minimum wetting rate (MWR) of the isothermal R-113 falling film was examined. The amplitude, frequency, velocity and wave length on the film were also investigated. The MWR was not obtained even at extremely small flow rate of 0.38cc/min (Re_f=0.70). That flow rate was much smaller than the value expected for the smooth surface film although the surface observed was flat. In Re_f<∿300,waves were symmetrical between the front and the back side and behaved like theoretical small-perturbation waves which was postulated on the smooth-laminar film. When Re_f>∿300,the waves grew as proceeding to downstream, began to behave like roll waves and the characteristics deviated from those of the small perturbation waves.
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