A comparative study of single normal, X type and split-film anemometer probe measurements in kerosene/water two-phase flow

This paper describes the use of hot-film anemometry in two-phase liquid - liquid flows with particular reference to kerosene/water flows. The origin of this research work was an experimental study of `bubbly' kerosene/water two-phase flow in a vertical pipe, in which detailed flow information was required for the continuous water phase. A detailed study was carried out to identify (i) the optimized fluid-flow conditions for hot-film measurements in kerosene/water flows, (ii) accurate long-term stable calibration procedures and (iii) two-phase flow-measurement techniques for identifying the bubble (or droplet) part and the continuous phase part of the hot-film signal. Computer-based calibration and related signal analysis procedures have been developed and implemented for single normal (SN), X array and split-fibre (SF) hot-film probes. An outline of the methodology is given for each technique. The compatability of the three hot-film probe techniques was demonstrated by comparative volume fraction and continuous phase measurements in kerosene/water flow for the volume fraction, , range 5 - 40%.