Nonequilibrium models of multicomponent condensation are reviewed with particular attention to the various ways in which the rates of condensation can be calculated. Ways of solving the mixed set of differential and algebraic equations that constitute the model are discussed, and it is suggested that differential conservation equations be approximated by finite differences and the resulting set of only algebraic equations solved simultaneously (using Newton's method) with the nonlinear equations representing the processes of Interphase transport and interfacial ' equilibrium. With regard to the various models of vapor-phase transport, it is shown that simple effective dlffusivity models may lead to significant over-or underdesign when compared to more soundly based models which take vapor-phase diffusional interaction effects into account. It Is also demonstrated that there is little to distinguish models based on the use of the Chilton-Colburn analogy to obtain the heatand mass-transfer coefficients from turbulent eddy diffusivity models when both are used to predict the performance of multicomponent condensers.
High quality high voltage and extra-high voltage extruded dielectric transmission cables can be made with the use of appropriate insulation and semiconductive materials and with special processing equipment. The requirements for the cleanliness of the insulation products are defined. The methods required to produce, test and maintain high levels of cleanliness are also elucidated. The criticality of the smoothness of the semiconductive conductor shields is described and the methods used for producing and testing these shields are also explained. Cable data showing excellent transmission properties for these extruded dielectric cables are presented.
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