Fluid flow up a spinning egg and the Coriolis force

Martı́nez, J. C.; Polatdemir, E; Bansal, Ankit; Wang, Yifeng; Shengtao, Wang

doi:10.1088/0143-0807/27/4/012

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The Coriolis effect on fluids can be demonstrated by using a turntable [14] or by watching fluids going up around a rotating egg [15]. It has also been discussed in connection to the light arriving from the Sun [16].…”

Section: Introductionmentioning

confidence: 99%

Hands-on visualization of the effect of fictitious forces with a laser pointer

Vázquez-Dorrío,

Paredes,

Angel Queiruga-Dios

2023

Eur. J. Phys.

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Inertial motion looks like accelerated motion when observed from the point of view of a non-inertial reference frame. A non-inertial observer can then describe the trajectories by introducing fictitious forces, like the centrifugal and Coriolis forces, that arise from the coordinate change between reference frames. This well-known fact is part of the typical Physics syllabus for undergraduate scientists and engineers, and a number of interesting classroom demonstrations have been discussed in the literature. We present a complementary possibility for the visualization of the effect of fictitious forces by shining a blue laser beam on a rotating platform covered with a phosphorescent vinyl sheet. The laser can be moved in order to simulate inertial motion in the laboratory frame for the trajectory of the laser spot. This gets immediately imprinted in the rotating phosphorescent material resulting in non-inertial trajectories that can be readily observed and compared to the dynamics governed by fictitious forces. Since friction is not considered, this hands-on activity can be considered as a direct demonstration of the effect of pure fictitious forces in and out of the classroom. The approach is simple, inexpensive, fast and non-destructive, and can therefore be very convenient for active lecture demonstrations or individual activities of students. We also describe some educational possibilities of how to use the procedure in the classroom or in the laboratory.

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Section: Introductionmentioning

confidence: 99%

Hands-on visualization of the effect of fictitious forces with a laser pointer

Vázquez-Dorrío,

Paredes,

Angel Queiruga-Dios

2023

Eur. J. Phys.

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“…Martinez 3 analyzed the fluid flow of a spinning sphere in the mid-latitude region, between the lower pole and the equator. Martinez's analysis showed the presence of the Coriolis force when the physics are analyzed in a non-inertial reference frame.…”

Section: Introductionmentioning

confidence: 99%

Eggs and milk: Spinning spheres partially immersed in a liquid bath

2015

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When a hard-boiled egg spins through a pool of milk on the kitchen counter, the milk rises up the sides of the egg and droplets are ejected. This phenomenon occurs when any partially submerged object whose radius increases upward from the fluid surface (e.g., spheres, inverted cones, and rings) spins in a liquid bath. The fluid ejects from the surface near the maximum radius in one of three ejection modes: jets, sheets, or sheet breakup. Additionally, a surprisingly large flow rate is induced by the spinning object. In this study, we used spheres to determine the effects of experimental parameters on the induced flow rate. We characterized the modes of ejection and measured the sheet breakup distance using high-speed imaging. The basis of our closed form analytical model utilizes an integral momentum boundary layer analysis both beneath the free surface and in the thin film attached to the sphere. We present criteria defining the transitions between ejection modes and the radius where liquid sheets break up in the sheet ejection regime. Criteria defining the transitions between ejection modes and the radius where liquid sheets break up in the sheet ejection regime shows good agreement with experiments.

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Transient flow and heat transfer from a rotating sphere around its vertical axis floating in a stationary fluid

Safarzadeh

Rahimi

2022

J Braz. Soc. Mech. Sci. Eng.

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Fluid flow up a spinning egg and the Coriolis force

Cited by 5 publications

References 13 publications

Hands-on visualization of the effect of fictitious forces with a laser pointer

Hands-on visualization of the effect of fictitious forces with a laser pointer

Eggs and milk: Spinning spheres partially immersed in a liquid bath

Transient flow and heat transfer from a rotating sphere around its vertical axis floating in a stationary fluid

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