MIT Unit Affiliation:
Lab Affiliation(s):
Juanes Research Group
Advisor:
Ruben Juanes
Date PhD Completed:
February, 2017
Expected End Date of Post Doctoral Position:
August 11, 2016

Benzhong Zhao

  • Post Doctoral

MIT Unit Affiliation: 

  • Civil and Environmental Engineering

Lab Affiliation(s): 

Juanes Research Group

Date PhD Completed: 

Feb, 2017

Expected End Date of Post Doctoral Position: 

August 11, 2016

CV: 

Thesis Title: 

Multiphase flow in porous media: the impact of capillarity and wettability from field-scale to pore-scale

Thesis Abstract: 

Multiphase flow in the context of this Thesis refers to the simultaneous flow of immiscible fluids. It differs significantly from single-phase flow due to the existence of fluid-fluid interfaces, which are subject to capillary forces. Multiphase flow in porous media is important in many natural and industrial processes, including geologic carbon dioxide (CO2) sequestration, enhanced oil recovery, and water infiltration into soil. Despite its importance, much of our current description of multiphase flow in porous media is based on semi-empirical extensions of single-phase flow theories, which miss key physical mechanisms that are unique to multiphase systems. One challenging aspect of solving this problem is visualization—flow typically occurs inside opaque media and hence eludes direct observation. Another challenging aspect of multiphase flow in porous media is that it encompasses a wide spectrum of length scales—while capillary force is active at the pore-scale (on the order of microns), it can have a significant impact at the field-scale (on the order of kilometers). 

 

In this Thesis, we employ novel laboratory experiments and mathematical modeling to study multiphase flow in porous media across scales. The field-scale portion of this Thesis focuses on gravity-driven flows in the subsurface, with an emphasis on application to geological CO2 storage. We find that capillary forces can slow and stop the migration of a CO2 plume. The meso-scale portion of this Thesis demonstrates the powerful control of wettability on multiphase flow in porous media, which is manifested in the markedly different invasion protocols that emerge when one fluid displaces another in a patterned microfluidic cell. The pore-scale portion of this Thesis focuses on the impact of wettability on fluid-fluid displacement inside a capillary tube. We show that the contact line movement is strongly affected by wettability, even in regimes where viscous forces dominate capillary forces. 

 

Link: http://hdl.handle.net/1721.1/109644

Contact Information: