Abstract
The penetration behaviour of impacting particles into glycerol solutions has been studied. A high-speed video technique has been used to observe the particle motion during penetration and to measure the transient displacement of the particle. The experimental range is 10≤ Re 0≤61 000, 410≤ Fr 070 000 and 0.287 ≤ ϱ 0.953, where Re 0 Fr 0 and ϱ′ are the particle Reynolds number ( v 0 d p ϱ/ μ), the particle Froude number ( v 0 2/ d p g) and the solid to liquid density ration ( ϱ p/ ϱ) respectively. Comparing a of an equation of motion for a particle penetrating a liquid interfece with the corresponding experimental results revealed that the standard drag coefficients are inappropriate to represent particle impacts owing to the dynamic nature of the flow. This effect was more pronounced with increasing ϱ′. The critical condition for particle penetration is Re 0 ≈ 250.
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