โ Scribed by T. Pujol; J. E. Llebot
No coin nor oath required. For personal study only.
Paltridge found reasonable values for the most significant climatic variables through maximizing the material transport part of entropy production by using a simple box model. Here, we analyse Paltridge's box model to obtain the energy and the entropy balance equations separately. Derived expressions for global entropy production, which is a function of the radiation field, and even its material transport component, are shown to be different from those used by Paltridge. Plausible climatic states are found at extrema of these parameters. Feasible results are also obtained by minimizing the radiation part of entropy production, in agreement with one of Planck's results. Finally, globally averaged values of the entropy flux of radiation and material entropy production are obtained for two dynamical extreme cases: an earth with uniform temperature, and an earth in radiative equilibrium at each latitudinal point.
๐ SIMILAR VOLUMES
## It is shown how the expression for the entropy production in an electrochemical system has to be generalized so to include the case of non-uniform pressure. Then the statement about the equalization of pressures follows from the non-negative character of the entropy production, just as do the o
In recent publications (Km and Greenfield, 1975, Levee, 1986, and Christensen, 1986), an experimentally observed phenomena of pressure drop hysterisis in two phase, cocurrent downflow of gas and liquid in packed beds has been reported. Until now, the phenomena is only qualitatively explained as an