This paper describes an integrated experimental procedure for obtaining accurate measurements with both single normal (SN) and X hot-film probes in water flows. The first pari of the paper describes techniques developed to overcome the common problems of temperature variations and contamination in a recirculating test facility, leading to long-term calibration stability. The second part of the paper describes the development of fast, reliable and accurate computer-based calibration methods for both SN and X probes. The final section of the paper describes comparative measurements between an SN and an X probe in vertical upward water pipe flow, demonstrating the validity of the methods developed.
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%.
This paper describes an integrated experimental procedure for obtaining accurate measurements with split-film (SF) probe anemometry in water flows. The paper describes the development of a fast, reliable and accurate calibration and signal analysis technique. Comparative measurements between the SF probe, single normal (SN) and X hot-film probes demonstrate the validity of the method developed.
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