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Year 2005, Volume 17 / Issue 1-2

DOI: 10.1615/MultScienTechn.v17.i1-2

Pages: 190

DOI: 10.1615/MultScienTechn.v17.i1-2.60

Article price - $45.00

EXPERIMENTS ON THE TURBULENT STRUCTURE AND THE VOID FRACTION DISTRIBUTION IN THE TAYLOR BUBBLE WAKE

L. Shemer
School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv, Israel

A. Gulitski
School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv, Israel

Dvora Barnea
School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv, Israel

An experimental approach is developed to carry out PIV measurements and to perform digital processing of the recorded PIV images to measure simultaneously the instantaneous turbulent velocity field and the void fraction distribution in the wake region of a Taylor bubble. Advanced methods of data processing, such as ensemble averaging and Proper Orthogonal Decomposition (POD), are applied. Results of measurements performed in our newly constructed experimental facility are presented. Two liquid flow rates were employed, corresponding to Reynolds numbers of 820 for laminar background flow and 7500 for turbulent flow. The mean characteristics of the velocity field in the wake region are calculated by ensemble-averaging the instantaneous velocity fields measured around 200 different bubbles. An algorithm to estimate the void fraction distribution in the axial pipe cross-section from the recorded PIV images is developed.

pages 103-122

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