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Revision of Bubble Bursting: Universal Scaling Laws of Top Jet Drop Size and Speed
Physical Review Letters ( IF 8.6 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1103/physrevlett.119.204502
Alfonso M. Gañán-Calvo

The collapse of a bubble of radius Ro at the surface of a liquid generating a liquid jet and a subsequent first drop of radius R is universally scaled using the Ohnesorge number Oh=μ/(ρσRo)1/2 and a critical value Oh* below which no droplet is ejected; ρ, σ, and μ are the liquid density, surface tension, and viscosity, respectively. First, a flow field analysis at ejection yields the scaling of R with the jet velocity V as R/lμ(V/Vμ)5/3, where lμ=μ2/(ρσ) and Vμ=σ/μ. This resolves the scaling problem of curvature reversal, a prelude to jet formation. In addition, the energy necessary for the ejection of a jet with a volume and averaged velocity proportional to RoR2 and V, respectively, comes from the energy excess from the total available surface energy, proportional to σRo2, minus the one dissipated by viscosity, proportional to μ(σRo3/ρ)1/2. Using the scaling variable φ=(Oh*Oh)Oh2, it yields V/Vμ=kvφ3/4 and R/lμ=kdφ5/4, which collapse published data since 1954 and resolve the scaling of R and V with kv=16, kd=0.6, and Oh*=0.043 when gravity effects are negligible.

中文翻译:

修订气泡破裂:顶部喷射液滴尺寸和速度的通用缩放定律

半径气泡的崩溃 [RØ 在产生射流的液体表面以及随后的第一半径下降处 [R 通常使用Ohnesorge数进行缩放 =μ/ρσ[RØ1个/2个 和临界值 * 在其以下没有液滴喷出; ρσ, 和 μ分别是液体密度,表面张力和粘度。首先,喷射时的流场分析得出[R 随着射流速度 伏特 作为 [R/μ伏特/伏特μ-5/3, 在哪里 μ=μ2个/ρσ伏特μ=σ/μ。这解决了曲率逆转的定标问题,这是射流形成的前奏。此外,喷射量与平均速度成正比的射流所必需的能量[RØ[R2个伏特分别来自总可用表面能的过剩能量,与 σ[RØ2个,减去粘度所耗散的那一个,与 μσ[RØ3/ρ1个/2个。使用缩放变量φ=*--2个,它产生 伏特/伏特μ=ķvφ-3/4[R/μ=ķdφ5/4,它折叠了自1954年以来发布的数据,并解决了 [R伏特ķv=16ķd=0.6, 和 *=0.043 当重力影响可忽略不计时。
更新日期:2017-11-17
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