Laminar wavy region

Portalski (P5), 1964 From Kapitsa s theory of wavy film flow, it is shown that regions of reversed flow exist under the wave troughs, leading to the generation of circulating eddies which may explain the increased rates of heat and mass transfer to wavy laminar films. 

A relation for the Reynolds number in the wavy laminar region can be determined by substituting the h relation in Eq. 10-25 into the Re relation in Eq. 10-1J and simplifying. It yields... 

In the transition region between laminar and turbulent condensation, the condensate film is wavy. In Fig. 4.12 this transition region is represented by the dotted lines, according to results from Henstock and Hanratti [4.16]. 

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