This paper presents the results of a series of experiments to study the influence of diameter on the loading of a single rigid cylinder subjected to air-water cross-flow. Five rigid cylinders of same length and different diameters ($12.15×10−3 m$ to $31.9×10−3 m$) were tested over void fractions ranging from 10% to 80%. The fluctuating lift forces on the cylinder are measured and represented in the form of power spectral density. A scaling model of these forces previously developed from one series of experiments with one tube diameter $(12.15×10−3 m)$ is tested on these new results by investigating the effect of tube diameter $D$. Unlike single phase results where the force spectra vary as $D3$, it is shown that for two-phase flows, the force spectra vary as $D2$. The experimental data collapse remarkably well. Both local void fraction and flow regime appear to be sensitive parameters. It confirms the importance of a precise knowledge of the local characteristics of two-phase flows in the study of buffeting forces mechanisms.

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