Can bubbles coalesce leads to strombolian eruptions

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Unformatted text preview: n magma viscosity Rise of Bubbles S to k e s L a w : # ( !l " !g )g & 2 !l gd 2 v=% ( d ) 18 µ $ 18 µ ' v is velocity, d is bubble diameter (µ is dynamic viscosity) F o r b a s a ltic liq u id , 1 m m b u b b le r is e s a t 0 .5 m /h ( 1 k m in 3 m o n th s ) , 1 c m b u b b le a t 5 0 m /h r F o r w e t g r a n itic liq u id , 1 m m b u b b le r is e s a t 0 .4 m /y r , 1 k m in 2 5 0 0 y r s . 13 Conduit Flow Regimes Model of Vergniolle & Jaupart 14 Role of Viscosity & Yield Strength Yield strength and viscosity key factors in eruptive style L o w v is c o s ity , y ie ld s tr e n g th fa v o r c o lla p s e o f fo a m , a n d a ls o a n n u la r flo w . H ig h e r v is c o s ity in h ib its fo a m c o lla p s e When collapse occurs, slug rise favored over annular flow. 15...
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This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).

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