SH-waves in a medium containing a low-velocity layer

No abstract

De wereld van morgen : Internationale Informatica Olympiade en Science Fair

Van 26 juni tot 3 juli vond in Eindhoven de Internationale Informatica Olympiade (IOI'95) plaats. Deelnemers waren 213 getalenteerde leerlingen uit het voortgezet onderwijs uit 52 landen. Ter gelegenheid van de IOI werd een Science Fair georganiseerd waar bedrijven, universiteiten en hogescholen informatica toepassingen demonstreerden. Alle HAVO/VWO-leerlingen werden hiervoor uitgenodigd door een 'Wild van wetenschap'-krant. De Science Fair werd bezocht door ongeveer 22.000 mensen

An analysis of the falling film gas-liquid reactor

A mathematical model of the falling film reactor is developed to predict the conversion and temperature distribution in the reactor as a function of the gas and liquid flow rates, physical properties, the feed composition of the reactive gas and carrier gas and other parameters of the system. Transverse and axial temperature profiles are calculated for the laminar flow of the liquid phase with concurrent flow of a turbulent gas to establish the peak temperatures in the reactor as a function of the numerous parameters of the system. The reaction rate in the liquid film is considered to be controlled by the rate of transport of reactive gas from the turbulent gas mixture to the gas-liquid interface. The governing equations are solved by reformulating the problem in integral equation form employing Green's functions. The predicted reactor characteristics are shown to agree with large-scale reactor performance, and the effects of the most sensitive parameters are elucidated to provide a basis for reactor optimization. Numerical results are presented for realistic sulfonation reactor conditions