Interaction effects between a cylindrical hot-film anemometer probe and bubbles in air/water and oil/water flows

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Abstract
A theory is presented which describes the interaction between a cylindrical element and a bubble front and rear interface, and these results are used to interpret the heat transfer effects from a hot-film probe in contact with a bubble. Stepwise interface tests were carried out to test the main features of the developed theory, and a good agreement was demonstrated. However, bubbly two-phase flows are dynamic situations, and dynamic interface and single-bubble tests were also carried out to evaluate the additional dynamic effects. These results emphasised the main features of the static theory and tests, and confirmed that dynamic effects related to distortion of the menisci, meniscus formation and film stability must be included to describe correctly the response of a hot-film probe to the passage of a bubble. Tests were carried out for both air/water and kerosene/water mixtures and in both cases similar responses were obtained.

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