BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Physics of mantle melting: two-phase flow\, variable matrix viscos
 ity and density effects - Harro Schmeling (Goethe-Universität Frankfurt)
DTSTART:20160414T090000Z
DTEND:20160414T100000Z
UID:TALK65474@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:In the introduction different partially molten regions within 
 the earth&#39\;s  mantle will be identified. Then\, the governing equation
 s are introduced with  emphasis on rheology\, melt density\, and solution 
 strategies. The melt fraction  and its geometrical distribution has an imp
 ortant influence on the shear and  bulk viscosity of the matrix. A new sem
 i-analytical model is introduced which  may describe the geometrical distr
 ibution of the melt phase. Combined with a  poro-elastic effective medium 
 approach (Schmeling et al.\, 2012) effective shear  and bulk viscosity can
  be estimated as a function of melt fraction. Models of 2D  porosity waves
  are shown which use such effective viscosity laws. Another  important qua
 ntity is the melt density which may be higher than the matrix  density at 
 transition zone depths. 1D models of a rising hot partially molten  plume 
 show that within a certain parameter regime standing porosity waves may  d
 evelop. If there is time\, I will briefly mention a simple mantle convecti
 on  benchmark initiative with two-phase flow in its partially molten regio
 n.  Schmeling\, H.\, J.-P. Kruse\, and G. Richard\, 2012: Effective shear 
 and bulk  viscosity of partially molten rock based on elastic moduli theor
 y of a fluid  filled poroelastic medium. Geophys. J. Int.\, doi:  10.1111/
 j.1365-246X.2012.05596.x&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR