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Boiled Egg Republic of Korea Superheated Lee Sang kyu

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Contents Experimental setup Torsion viscometer Theoretical Explanation Force induced by viscosity Energy loss in one period Inertia of moment Solidification of egg Experiment Analysis Result Conclusion

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1. Problem Construct a torsion viscometer. Use it to investigate the differences in the 'viscous' properties of hens' egg that have been boiled to different extents.

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2. Basic Idea Torsion viscometer – Device to measure viscosity using the fact that viscosity of liquid intervenes rotation of torsion pendulum. – Using this principle, it is possible to know the egg s viscous properties without breaking it. Viscosity

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3. Experimental Setup Egg Aluminum cyllinder (Making I even greater) Rotation Sensor Spring (Making the periodic oscillation)

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4. Theoretical Explanation Liquid in the egg will make the oscillation damping. Supposing an egg as an ellipsoid : x y a b

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Theoretical Explanation cont. Equation of damping oscillation of torsion device is : Resisting force in the damping oscillation is :

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Energy loss in one period (Energy damping) Energy damping – From the device Device has toothed wheels, making the loss of energy proportional to its rotating amount = angular position change – From the egg Expected to be proportional to (angular velocity) 2, as is any damping oscillation.

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Inertia moment 1. Egg (assuming that its shaped like an ellipsoid) r x y 2. Device (cylinder)

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Solidification of egg Supposed boiling process of egg Heat Boiling time (sec. In 100 water) Thickness of solidified albumen 301.9mm 602.4mm 903.35mm 1204.4mm 180Complete Viscosity : Same Viscous property : Change (As amount of liquid changes)

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Experiment Device

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General damping oscillation Damping Oscillation Time (sec.) Angle (deg)

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All the damping oscillation Damping Oscillation with eggs boiled to various degrees Unboiled egg Boiled egg to various degrees

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Analysis Energy loss from the device is proportional to the angular position change, as the toothed wheel in the sensor is the main friction source. Angular position change during one period (deg) Energy loss from thedevice (J)

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Analysis cont. Leaving out energy loss from the device, the one from egg remains to be proportional to (angular velocity) 2 (Everything in 15 ) 1.It is not proportional 2.Slightly boiled egg had less viscous effect than expected (angular velocity) 2 mean value in one period (deg/s) 2 Energy damping fromthe egg in one period (J)

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Why not proportional? 0 sec. Boiled egg s graph is : A B C A region : Too slow : Less energy loss from the device B region : Almost same as expected C region : Too fast : Albumen cant follow the solid part : less viscous property than expected.

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Why less viscous than expected? Unboiled egg 30 sec. Boiled egg

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Why less viscous than expected? Cont. Actual boiling process Heat

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Viscous effect of an egg when boiled to different extent Result Boiled time(s) bViscosity, (relative viscous property) 04.88e-51.457 Pa · s (1) 302.58e-5(0.529) 901.90e-5(0.389) 1201.22e-5(0.250) 1507.32e-6(0.150) 1807.27e-6(0.149) LiquidViscosity (Pa · s) Glycerin1.17 Lubricating oil 0.1~1 Water0.00114

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Conclusion A torsion viscometer can be made using damping effect of viscous liquid. Measured viscosity – 1.457 Pa · s Egg is to solidify when boiled, making its viscous effect less. – Egg liquid is so sticky that some expectations are wrong about the egg – And as its solidification fixes yolk at particular position, make the egg much less viscous.

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Energy loss fitting in B part Fitting proportionally

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Analysis cont. Too slow Too fast!!

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General damping oscillation Damping Oscillation Time Angle (deg)

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All the damping oscillation Damping Oscillation with eggs boiled to various degrees

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How to fit Fitting the graphs as following :

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