Heat transfer measurements in pulsed annular flow using non-invasive temperature technique

A single species vertical two-phase oscillatory annular flow facility allows simultaneous measurements of film thickness and wall temperature using non-invasive optical techniques. Long pulse trains allow accurate phase averaging of data. Heat transfer coefficients between the wall and thin film are calculated from measured data and compared to steady-state heat transfer correlations in a variety of flow conditions with varying pulse frequency, pulse amplitude and wall heating.