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The liquid film can be observed in different hydrodynamic conditions. This conditions are characterised by the so called film Reynolds number, which is determined as follows: Re(film) = 4 G / h G = mass flow per circumference h = fluid viscosity When comparing data in literature care has to be taken what kind of Re(film) definition is used
Under this flow conditions the Nusselt law for film thickness and subsequent heat transfer can be applied. This means Heat transfer increased with thinner liquid films and therefor smaller Film Reynolds numbers
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