John Francis Brady | |
---|---|
Born | 8 January 1954 |
Nationality | American |
Alma mater | University of Pennsylvania University of Cambridge Stanford University |
Awards | National Academy of Sciences (2020) Society of Rheology (2015) ContentsAmerican Physical Society (1994) |
Scientific career | |
Fields | Fluid dynamics Rheology |
Institutions | Massachusetts Institute of Technology California Institute of Technology |
Doctoral advisor | Andreas Acrivos |
John Francis Brady (born January 8, 1954) is an American chemical engineer and the Chevron Professor of Chemical Engineering and Mechanical Engineering at the California Institute of Technology. He is a fluid mechanician and creator of the Stokesian dynamics method for simulating suspensions of spheres and ellipsoids in low Reynolds number flows. He is an elected fellow of the American Physical Society, a fellow of the Society of Rheology, as well as a member of the National Academy of Sciences, the National Academy of Engineering, and the American Academy of Arts and Sciences.
Brady was educated in chemical engineering at the University of Pennsylvania (B.S. 1975), the University of Cambridge, England (Certificate of Postgraduate Study, 1976), and Stanford University (M.S. 1977 and Ph.D. 1981). He completed his dissertation entitled Inertial effects in closed cavity flows and their influence in drop breakup advised by Professor Andreas Acrivos. Following his Ph.D., Brady was a NATO post-doctoral fellow at the Ecole Superiéure de Physique et de Chimie Industrielles, Paris, France (1980–81). [1]
Following his research in France, Brady joined the faculty in chemical engineering at the Massachusetts Institute of Technology as an assistant professor in 1981. He moved in 1985 to the Division of Chemistry and Chemical Engineering at the California Institute of Technology, which has been his academic home since. [2]
In 1999, Brady was elected a member of the National Academy of Engineering for his work in elucidating the basic mechanics of and developing methods for the simulation of multiphase flows.
Brady is an expert in the theory and simulations of fluid mechanics, rheology, and transport phenomena. He has made significant research contributions in the understanding of active matter and suspensions. Among his many accomplishments is the creation of Stokesian dynamics [3] with Georges Bossis. The Stokesian dynamics method allows the accurate and rapid simulation of the dynamics and rheology of suspensions of spherical particles at low Reynolds number. [4] [5] The technique has been used by researchers world-wide to model suspensions and understand a variety of physical systems. Brady and collaborators discovered the micromechanical "swim pressure" that contributes to the unique self-assembly and phase separation in a broad class of active matter. [6]
Brady was an associate editor of the Journal of Fluid Mechanics (1990-2004) and the editor of the Journal of Rheology (2005-2012). According to Google Scholar, his publications have received over 19,000 citations and his h-index is 68. [7]
He has received numerous awards and honors which include:
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Stokesian dynamics is a solution technique for the Langevin equation, which is the relevant form of Newton's 2nd law for a Brownian particle. The method treats the suspended particles in a discrete sense while the continuum approximation remains valid for the surrounding fluid, i.e., the suspended particles are generally assumed to be significantly larger than the molecules of the solvent. The particles then interact through hydrodynamic forces transmitted via the continuum fluid, and when the particle Reynolds number is small, these forces are determined through the linear Stokes equations. In addition, the method can also resolve non-hydrodynamic forces, such as Brownian forces, arising from the fluctuating motion of the fluid, and interparticle or external forces. Stokesian Dynamics can thus be applied to a variety of problems, including sedimentation, diffusion and rheology, and it aims to provide the same level of understanding for multiphase particulate systems as molecular dynamics does for statistical properties of matter. For rigid particles of radius suspended in an incompressible Newtonian fluid of viscosity and density , the motion of the fluid is governed by the Navier–Stokes equations, while the motion of the particles is described by the coupled equation of motion:
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