where
DP
Dt
is the substantive time derivative of pressure. In contrast to shear
and radioactive heating, adiabatic effects can be either positive or negative. It is known from thermodynamics that the temperature of a substance under conditions of no thermal exchange increases with increasing pressure and decreases with
decreasing pressure, which thus directly reflects the sign of
DP/Dt. The effects ofadiabatic heating can be very significant in cases of strong changes in pressure, a fact which has implications for mantle convection.
The latent heat production/consumption (HL) is due to the phase transformations in rocks subjected to changes in pressure and temperature. A very common type of latent heat is the latent heat of melting, which is negative (heat sink, HL < 0) for melting and positive (heat production, HL > 0) for crystallisation.
whereDPDtis the substantive time derivative of pressure. In contrast to shearand radioactive heating, adiabatic effects can be either positive or negative. It is known from thermodynamics that the temperature of a substance under conditions of no thermal exchange increases with increasing pressure and decreases withdecreasing pressure, which thus directly reflects the sign ofDP/Dt. The effects ofadiabatic heating can be very significant in cases of strong changes in pressure, a fact which has implications for mantle convection.The latent heat production/consumption (HL) is due to the phase transformations in rocks subjected to changes in pressure and temperature. A very common type of latent heat is the latent heat of melting, which is negative (heat sink, HL < 0) for melting and positive (heat production, HL > 0) for crystallisation.
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