Do D.D.'s Adsorption analysis: Equilibria and kinetics PDF

By Do D.D.

ISBN-10: 1860941303

ISBN-13: 9781860941306

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It is also not allowed to assume that the glass and mercury temperature are the same. For the glass and mercury temperature separate differential equations should be used. The heat transfer through the glass can then be modeled by several differential equations in series. • Uniform mercury tube In the model it is assumed that the cross sectional area of the mercury tube does not depend on the height. This should be verified since it will depend on the construction of the tube. Often, as is the case here, the description of the assumptions will be more elaborate than the mathematical formulation of the model.

The enthalpy H is a function of temperature, pressure, phase, and composition. Usually the pressure dependency can be neglected. 81) Only the contribution of the enthalpy change is of interest in the energy balance. 3 Energy Relationship Composition dependency The specific enthalpy Hˆ depends not only on the temperature but also on the composition. 83) a b where na and nb are the number of moles of components A and B. More specifically, na and nb can be replaced by ni to indicate an arbitrary component i.

When the expansion is the same in all directions, γ = 3α. 3 Modeling Steps Fig. 6. Volumetric expansion coefficients for various liquids. • Models for heat transfer. In the proposed model it is implicitly assumed that the temperatures of the glass and the mercury are the same. It is, however, questionable whether this is true. The temperature of the glass changes always before the mercury temperature, because the glass is exposed to the medium. This effect could be taken into account if required.

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Adsorption analysis: Equilibria and kinetics by Do D.D.

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