Steering paramagnetic Leidenfrost drops in an inhomogeneous magnetic field - PhysLab

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Steering paramagnetic Leidenfrost drops in an inhomogeneous magnetic field

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Student Manual

The Leidenfrost Effect is a phenomenon in which a liquid drop levitates on a surface that is significantly hotter than its boiling point. When we create Leidenfrost drops using a paramagnetic liquid, such as oxygen, we end up with liquid drops that hover above a surface with negligible friction, and since oxygen is paramagnetic, can be controlled by a magnetic field.

Software Code Extract the Mathematica Notebook, the tracked trajectories and execute the code
Matlab files to assist in the data analysis
Tracker
Sample Results Student report Fall 2018
Finding the magnetic field profile and magnetic energy density profile (July 2019)
PDF version of the Mathematica notebook showing complete analysis of the data (notebook can be downloaded from the software code field above))
Solution Manual Qasim May 2019
Hardware Manual Photograph of grid (white grid lines on black background). Print on A4 with 1200 dpi resolution
Experiment Code 2.23
Version April 22, 2019 Version 2019-v1

Further Readings and References

  • Ch 9: Molecular Orbitals
    General Chemistry, D. A. McQuarrie, P. A. Rock, E. B. Gallogly, Ethan B.,, Fourth Edition, 275-277, (2011).
  • Magnetic control of Leidenfrost drops
    Physical Review E, K. Piroird, C. Clanet and D. Quere,, 85, (2012).
  • Central Force Motion
    An Introduction to Mechanics, D. Kleppner and R. Kolenkow,, 378-381, (1973).

Pictorial Procedure

 


Hardware Description

The copper cone is 10cm in height and 10cm in diameter. It holds enough liquid nitrogen to get a supply of liquid oxygen drops for around a couple of minutes. Underneath the tip of the cone is an aluminium bar with a depression along it’s axis. This is to make sure that the drop moves in a straight line as it enters the horizontal sheet. It allows us to vary the initial displacement of the drop (as explained in the video). This sheet is made of plexiglass, which is a cheap solution, but has some problems. The scratches on the surface of this sheet are very prominent in light, so we use a permanent marker to reduce light reflecting from the scratches. The screws near the corners of the sheet allow us to make sure that the sheet is horizontal. This is to ensure that the only force affecting the motion of the drops is the magnetic force. However, since this is a low cost setup and we only ensure that the sheet is horizontal using a spirit level, gravity does affect drops at very slow velocity. The plexiglass walls around the cone ensure that very little nitrogen vapours enter the recording area and makes sure the video recordings are clear and easy to analyse.

We need to make sure that we make no contact with any cold surface during the experiment. We use gloves for handling the glass that is used to pour liquid nitrogen. The cone must not be touched during the experiment, and even after the nitrogen has evaporated. The aluminium bar is not cold enough to be dangerous, but should still preferably not be touched with bare hands. The copper cone should be stable enough so that it can’t be accidentally tipped over while performing the experiment.

 

Lab 2 | Tags: magnetism, mechanics
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    • Lab-II (PHY 300/500)
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    • Class Demonstrations
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    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
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    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • Media
      • Lectures, Podcasts and Interviews
      • Videobytes
      • YouTube Channel
      • Visitors
      • Testimonials
    • The Scientific Mind Through the Eyes of a Physics Experimenter
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      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
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    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
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      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
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