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۱Investigation of thermal behavior a two–phase closed thermosyphon at medium input heat
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Although numerous works have been carried out in the field of high temperature applications, there is a lack of sufficient data on the actual thermal performance of thermosyphons for low input heat especially the geometric effects and inclination angle under normal operating conditions. Therefore, it is the objective of this work to examine the thermal behaviors in a thermosyphons by taking into consideration the evaporator geometry, inclination angle of tube, coolant flow rate and filling ratio. To obtain this objective, distilled water was used as the working fluid and two copper tubing of inside diameters of 14 and 20 mm with different ratios of evaporator length to the inside diameter of 15, 20 and 29.3 were implemented in this work. In addition, the temperature distribution along the thermosyphons, input heat to the evaporator and output from the condenser section was monitored. The results reveals that the thermosyphons has the highest rate of heat transfer in the inclination angle of 60° for all the three aspect and filling ratios adopted in this work. Furthermore, a good agreement was observed between the experimental results of the present study and the previous published correlations.<\div>

۲Kinetically Controlled O2 – N2 Adsorption for Air in a Carbon Molecular Sieve
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
One of the more interesting separation processes which has been developed in recent years in air separation by fixed bed adsorption on a carbon molecular sieve. Unlike most adsorptive separations the selectivity in the system is kinetic and depends on the faster diffusion of oxygen within the micropores of the carbon sieve. The oxygen is therefore preferentially adsorbed and using properly selected conditions it is possible to obtain a fairly high purity nitrogen product. The analysis of the above experiments requires a model for a two–component system. We consider an isothermal, dispersed plug–flow system in which frictional pressure drop in the bed is negligible. The variation in fluid velocity along the length of the column is accounted. The equilibrium relationships are represented by ternary Langmuir isotherm, and the mass transfer rates are given by linear driving force (LDF) rate expression .In order to solve the coupled partial differential equation, an orthogonal collocation method is employed. Also, we constructed an experimental set up .The experimental set up is a single column, of stainless steel (length 1000 mm, inside diameter 25 mm) was packed with carbon molecular sieve. The separation of air by pressure fixed bed carbon molecular sieve has been studied both experimentally and numerically over a wide range of product purities. A good agreement has been found between the experimental results and the prediction of dynamic adsorption process simulator over a wide range of purities.<\div>
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