Details

Autor(en) / Beteiligte

• Nguyen, C. T.
• Gonnermann, H. M.
• Chen, Y.
• Huber, C.
• Maiorano, A. A.
• Gouldstone, A.
• Dufek, J.

Titel

Film drainage and the lifetime of bubbles

Ist Teil von

• Geochemistry, geophysics, geosystems : G3, 2013-09, Vol.14 (9), p.3616-3631

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2013

Quelle

Access via Wiley Online Library

Beschreibungen/Notizen

• We present the results of new laboratory experiments that provide constraints on inter bubble film thinning and bubble coalescence as a consequence of liquid expulsion by gravitational and capillary forces. To ensure dynamic similarity to magmatic systems, the experiments are at small Reynolds numbers (Re≪1) and cover a wide range of Bond numbers (10−3 ≤ Bo ≤ 102). Results indicate that at Bo < 0.25 film drainage is due to capillary forces, whereas at Bo > 0.25 gravitational forces result in film thinning. The film drainage time scale is given by t ∼ C ln (α) τ and is orders of magnitude faster than often assumed for magmatic systems. Here, C ∼ 10 is an empirical constant and α is the ratio of initial film thickness to film thickness at the time of rupture and τ is the characteristic capillary or buoyancy time scale at values of Bo < 0.25 and Bo > 0.25, respectively. Key Points Empirical time scales for film drainage by gravitational and capillary forces Results show that drainage times are much faster than previously estimated