:OK, I'll tell you the secret : the thermal diffusivity of air is about 1.9 * 10-5 m2 / s and the diffusivity of water vapor in air is about 2.5 * 10-5 m2 / s.
22.
Note that the assumption the v is relatively large is equivalently to the assumption that the thermal diffusivity \ kappa is small compared to L ^ 2 / T, where L is the acean width ( from mid-ocean ridges to continental shelf ) and T is its age.
23.
However, the approximate solutions can still contain ( decaying ) spurious oscillations if the ratio of time step & Delta; times the thermal diffusivity to the square of space step, & Delta;, is large ( typically larger than 1 / 2 per Von Neumann stability analysis ).
24.
Where \ kappa is the thermal conductivity, \ rho is the density of the medium, C is the specific heat, \ alpha = \ frac { \ kappa } { \ rho C }, the thermal diffusivity and g is the rate of heat generation per unit volume.
25.
5 ) Since " The molecular diffusivity of water vapor in air is slightly higher than the thermal diffusivity of air " ( 2.5 vs 1.9 * 10-5 m2 / s ) per Short Brigade Harvester Boris, more water vapor will vent up the chimney than heat.
26.
The Stanton number arises in the consideration of the geometric similarity of the momentum boundary layer and the thermal boundary layer, where it can be used to express a relationship between the shear force at the wall ( due to viscous drag ) and the total heat transfer at the wall ( due to thermal diffusivity ).
27.
The speed that the heat travels away from the probe as well as the speed that it travels between probes allows scientists to measure thermal conductivity specific heat ( the ability of the regolith to conduct heat relative to its ability to store heat ) and thermal diffusivity ( the speed at which a thermal disturbance is propagated in the soil ).
28.
Salt finger theory relies on the lower layer being cold and the upper layer being warm such that thermal diffusivity causes displacement instability ( i . e . a bit of warm upper fluid is randomly displaced downward, quickly loses its heat to the ambient cold layer, and continues to fall downward because its density just increased through loss of heat ).
29.
:: : : : : : : It's physically impossible that " water vapor achieves equilibrium [ i . e ., complete mixing ] much faster than the temperature " or for water vapor to mix more quickly than heat, except in perfectly laminar flow ( where the molecular diffusivity of water vapor in air is slightly higher than the thermal diffusivity of air ).
30.
:: : : : : : : : : The molecular diffusivity of water vapor in air is slightly higher than the thermal diffusivity of air, but that's utterly irrelevant because the situation you're describing is nowhere close to laminar ( i . e ., the Reynolds number is > > 1 ) . talk ) 14 : 59, 28 July 2015 ( UTC)
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