Marbles in oil, just like a river?

S. Cameron, S. E. Coleman, B. W. Melville, Vladimir Ivanovich Nikora

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Citations (Scopus)


An oil flume in combination with a 100 Hz Particle Image Velocimetry system has been used to study entrainment of 11 turn diameter spherical Nylon particles. The flow field near the bed and around sediment particles holds essential information for studying entrainment mechanics, but measurements in water are often hampered by a lack of adequate resolution, particularly for smaller particle sizes. The higher viscosity of oil compared to water increases length scales, allowing water flows to be modelled with much larger sediment sizes and deeper near-bed flow layers. The 11 mm diameter particles used in the present oil flow experiments are dimensionally equivalent to 0.74 mm diameter quartz particles in water flow. Analysis of the flow field at the instant of bed particle movement indicates that sweep structures (higher than averaged streamwise velocity combined with bed-directed vertical velocity) are the dominant mechanism of entraining particles for the bed geometry and flow regimes studied.

Original languageEnglish
Title of host publicationRiver Flow 2006, v. 1, Taylor and Francis, London
Place of PublicationRiver Flow 2006, v. 1, Taylor and Francis, London
Number of pages8
Publication statusPublished - 2006




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