Fig. 6. (a) Reduction in non-dimensional length L(t)/D of the liquid plug, having (L/D)i = 6.7, when passing through heated wall maintained at different temperatures (data
corresponding to Fig. 5). The reduction in length due to drainage and subsequent evaporation of thin film is profound at wall temperature of 60 C, which is also reflected in
the velocity data in (b) below. (b) Velocity of liquid plug ((L/D)i = 6.7) inside the heater section for different wall temperature. Effect of evaporation and acceleration is clearly
seen for wall temperature of 60 C, where the length is drastically reduced due to evaporation, which can be predicted by Taylor’s law.