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The Energy Geosciences Division ( of Lawrence Berkeley National Laboratory has an exciting opportunity for a Hydrogeology Postdoctoral Scholar with expertise in multiphase fluid flow in geologic materials, with experience in conducting novel laboratory experiments over wide ranges of pressure and temperature. The research is focused on developing a more mechanistic understanding of the behavior of immiscible fluids in unconventional gas and oil shales. The incumbent will design and perform laboratory research to understand hydrostatics and hydrodynamics of water and gases (nonaqueous phase liquids and supercritical fluids at elevated pressure and temperature) in fractured, micro/nanoporous geologic media, with an emphasis on shales. The primary activities will be laboratory investigations on immiscible two-phase flow and equilibria between nano- to microporous rocks and fractures, and modeling and analyses of experiments for improving capillary scaling-based predictions. Related work may include experiments on fluid and interfacial processes including interactions between wettability, interfacial tension, and capillary breakthrough of gases.

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Context. 3 main gas laws This PDRA is part of a large project (BEBOP, 2019-2024) funded by the European Research Council. The goal of BEBOP is to figure out how we can use bacteria to control the properties of porous structures (e.g. porosity, permeability). We envision that this will unlock a new generation of biotechnologies, such as self-repairing construction materials or self-cleaning bioreactors. The main scientific obstacle to this technology is the lack of understanding of the biophysical mechanisms associated with the development of bacterial populations within complex porous structures. Therefore, the first scientific objective of BEBOP is to gain insight into how fluid flow, transport phenomena and bacterial communities (biofilms) interact within connected heterogeneous structures. npower electricity power cut To this end, we will combine microfluidic and 3D printed micro-bioreactor experiments; fluorescence and X-ray imaging; high performance computing bringing together CFD, individual-based models and pore network approaches. The second scientific objective of BEBOP is to create the primary building blocks toward a control theory of bacteria in porous media and to construct a demonstrator bioreactor for permeability control.

Role. The PDRA will develop a microfluidic porous system and use microscopy approaches to visualize the dynamics of bacterial growth, velocity and oxygen fields inside the porous structure. The PDRA will then use this system to study the biophysics of: 1) protozoan predation inside the porous structure, and 2) couplings between biofilms and transport mechanisms, first focusing on molecular signalling and the patterns of quorum sensing activation in the porous structure. The work will be done in collaboration with microbiologists for the preparation of mutants and a national micro-fabrication platform (LAAS- CNRS) for the microfluidics. gas arkansas The research can be adapted to the expertise and interests of the successful candidate. I am looking for somebody extremely motivated who will be fully involved in the project and in the group (2 PhDs + 1 postdoc starting in 2019, additional positions will also be available later on in the project).

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Context. The physics of two-phase flows in materials with pores larger than a few millimetres is significantly different from that of materials with smaller pores. Capillarity, for example, may play a much weaker role so that viscous, inertial and gravitational effects may dominate the flow. Modelling these systems is a considerable challenge since most models developed in porous media sciences, such as the generalized Darcy’s law, implicitly assume that capillarity is important. An important consequence of this is the absence of direct coupling forces between the two phases in the generalized Darcy’s law. In our group, we are studying two-phase flows within structures with centimetre-sized pores in a wide variety of applications, ranging from flows in structured packings used in distillation columns to geophysical media or PWR nuclear reactor cores in normal or accidental conditions. electricity and magnetism study guide 8th grade We have developed a joint expertise, experiments and collaborations with IRSN (radioprotection and nuclear safety institute), CEA (atomic energy commission), BRGM (geological and mining research bureau) or the company Air Liquid. The PDRA will be in direct collaboration with 3 PhD theses currently going on with IRSN, CEA and BRGM.

Role. The PDRA will develop a pore-scale simulation tool to describe two-phase flows in highly permeable porous media using a volume of fluid approach. oil n gas prices The successful candidate will use the high performance computing CFD software PELICANS/CALIF3S developed at IRSN, which already contains a first version of the code. The first step will be to perform the simulations on CALMIP’s supercomputer in the creeping limit. The work will require high-level C++ coding in CALIF3S for improving the model of the triple line. We are looking for somebody extremely motivated who will be fully involved in the project and in the group.