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For the theoretical modelling of pulsating heat pipes it is necessary to estimate the thickness of the liquid film deposited at the trailing edge of a liquid plug as it moves through a small diameter tube. A simple experimental set-up and procedure whereby this liquid film thickness may be determined is described and a correlation for the thickness is statistically derived. Using water as the working fluid at temperatures between 0 and 60 °C and velocities of 0.3 to 1.8 m/s the average film thickness varied between 100 and 200 μm and depended primarily on the surface tension of the liquid.

frontiers in heat pipes

AN EXPERIMENTAL INVESTIGATION OF THE THICKNESS OF THE LIQUID-FILM DEPOSITED AT THE TRAILING END OF A LIQUID PLUG MOVING IN THE CAPILLARY TUBE OF A PULSATING HEAT PIPE