Abstract
Methods of analysing and interpreting two-dimensional velocityfield data in order to understand the scales of turbulence ofbubbly two-phase flow were developed. Reynolds decompositionand large eddy simulation (LES) decompositions (low-passfiltering), in conjunction with proper orthogonaldecomposition (POD) energy spectra analysis, as well asadjusted convective decomposition (constant convectionvelocity is gas bubble velocity) were applied to analyse thestructure of turbulence. Particle image velocimetry was applied for velocity measurements. Decomposition analysis wasperformed for the local velocity around gas bubbles in a chosenregion. Various decomposition methodologies were applied forinterpretation of the results and it was found that the numberof eddies revealed and vorticity magnitude varied with thedecomposition method used. In particular, LES decomposition was found to perform better at showing smaller eddies.POD indicated the energy changesquantitatively through the spatial energy spectra, while thecomparison of single-phase flow with bubbly two-phase flowoffered an efficient way of decomposing the total velocity.A combination of convective decomposition and POD was applied tothe energy spectra level in order to obtain a novel view of theturbulence energy introduced by the gas bubbles.
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