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July 2022

MEAM Seminar: “Mixing with Activity: Transport of Swimming Microorganisms in Complex Flows”

July 5 at 10:00 AM - 11:30 PM
Towne 313, 220 S. 33rd Street
Philadelphia, PA 19104 United States
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How will swimming microorganisms affect the mixing of a diffusive contaminant in chaotic flows? Answers to this question can lead to improved understanding of the spread of pollutants (e.g. algal blooms) in oceans and lakes, as well as potentially useful applications in biofuel and vaccine productions. In this talk, I present recent experiments on the chaotic mixing of a passive pollutant in dilute suspensions of swimming Escherichia coli. I will first discuss the results in a two-dimensional (2D) time-periodic flow…

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MEAM Seminar: “Sedimentation of Active Suspensions: Hindrance and Phase-separation”

July 12 at 10:00 AM - 11:30 AM
Towne 313, 220 S. 33rd Street
Philadelphia, PA 19104 United States
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Sedimentation of active matter is found in many natural and industrial processes. It plays an important role on the distribution of plankton in oceans, which is key part of the carbon cycle (i.e. ocean's biological pump) that transports carbon from the ocean's surface to depth. In this seminar, I will present an investigation on the dynamics of the sedimentation of spherical colloids in presence of swimming microorganisms at various concentration within the dilute regime. In the first part of this…

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