Coalescence of Growing Bubbles in Highly Viscous Liquids
Coalescence of Growing Bubbles in Highly Viscous Liquids
复制标题
高粘性液体中不断生长的气泡的聚结
DOI:
10.1029/2022gc010618
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Toramaru Atsushi
中科院分区:
文献类型:
--
作者:
Ohashi Masatoshi;Maruishi Takafumi;Toramaru Atsushi
Bubble coalescence in ascending magma is a key process that controls the eruption violence and the texture of volcanic pyroclasts. In the present study, we performed in situ experiments to investigate the coalescence of two growing bubbles in highly viscous liquids (102 and 1,020 Pa ⋅ s). A new experimental apparatus enables us to directly observe the drainage of the film between growing bubbles in three dimensions. We combined the experimental results and a simple scaling analysis to reveal the dynamics of film drainage in terms of a capillary number depending on the liquid viscosityη, the bubble growth rate , and the surface tensionσ. The capillary number represents the interplay between the viscous force arising from bubble growth and the capillary force. AtCa≪ 1, two adjacent bubbles retain their spherical shapes until the film ruptures, and the capillary forces control the drainage timescale. In contrast, atCa≫ 1, bubbles largely flatten and bubble growth itself drives film drainage. We also provide a general formula for the drainage timescale over a wide range of capillary numbers (10−3<Ca< 101). Our results highlight the importance of bubble growth in the coalescence process. The variations of bubble shape and number density during decompression can be explained by the capillary number.
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