Download - Fluid Phenomena: Some Examples
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Fluid Phenomena: Some Examples
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1. Stellar Physics
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Ordinary Star:
Self-gravitating, rotating, gaseous sphere
Radius changes on time scales of 1010
years
Collapse in 103 s in absence of gas pressure
Solar granulation: 5 minute time scale
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Granular convection and sunspots as seen at 304 Angstroms
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Sun, as seen in the far ultraviolet (195 Angstroms)
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Prominences:
Magnetohydrodynamically
controlled
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Solar disturbances and coronal looping, as seen by a soft X-ray satellite-borne telescope
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Solar corona as seen during a solar eclipse
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No generally accepted theory for short term variations in solar luminosity
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Supernovae: Absorption of neutrinos produces shock wave that blows off envelope of gas. Shock wave stops at finite radius…envelope should then collapse but does not…..
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2. Mantle Convection
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3. Climate Dynamics
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Heat Transport by Oceans and Atmosphere
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Ocean Thermohaline Circulation
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A hot plate is brought in contact with the left half of the surface of a swimming pool of cold water. Heat diffuses downward and the warm water begins to rise. The strength of the circulation is controlled in part by the rate of heat diffusion. In the real world, this rate is very, very small.
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Adding a stirring rod to this picture greatly enhances the circulation by mixing the warm water to greater depth and bringing more cold water in contact with the plate. The strength of the lateral heat flux is proportional to the 2/3 power of the power put into the stirring, and the 2/3 power of the temperature of the plate.
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