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Physics and Astrophysics Research Seminar Series

Non-Newtonian Jellycopter

open book on table
Seminars

As part of the School of Science and Technology's Physics and Astrophysics Research Seminar Series, Jordan McConnell, Nottingham Trent University presents: Non-Newtonian Jellycopter.

  • From: Wednesday 13 November 2019, 1 pm
  • To: Wednesday 13 November 2019, 2 pm
  • Location: 015, CELS, Nottingham Trent University, Clifton Campus, Clifton Lane, Nottingham, NG11 8NS
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Event details

As part of the School of Science and Technology's Physics and Astrophysics Research Seminar Series, Jordan McConnell, Nottingham Trent University presents: Non-Newtonian Jellycopter.

Abstract

In laboratories around the world, scientists use magnetic stirrers to mix solutions and dissolve powders. It is well known that at high drive rates the stir bar jumps around erratically with poor mixing, leading to its nick-name 'flea'. Investigating this behaviour, we discovered a state in which the flea levitates stably above the base of the vessel, supported by magnetic repulsion between flea and drive magnet. We have carefully analysed the motion of the flea and found that in Newtonian fluids, the agreement between experiment and theory is very good. Levitation is stabilized by the flea’s oscillations which pump fluid radially outwards, and are only present for a narrow range of Reynold's numbers. We also use both the levitating and non-levitating states to measure rheological properties of the system. However, for non-Newtonian fluids, the agreement with theory breaks down and the motion of the flea becomes unpredictable. Work is ongoing to understand this behaviour.

This seminar is hosted by David FairhurstIan Shuttleworth

All Welcome

For any enquires please contact Ian Shuttleworth

Location details

Room/Building:

015, CELS

Address:

Nottingham Trent University
Clifton Campus
Clifton Lane
Nottingham
NG11 8NS

Past event

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