The influence of cross-section orientation on fluid flow and heat transfer in a periodic serpentine equilateral triangular microchannel was investigated by means of computational fluid dynamics (CFD) modeling. Serpentine channels with cross-sections of upward-and left-pointing equilateral triangles were consid-
New design method based on CFD and AM technology was applied to milli-reactors. CFD simulations were validated empirically with step responses and model reactions. 4-way inlet reactor with zigzag mixing channel showed the best mixing performance.
a b s t r a c tThe mixing performance of three passive milli-scale reactors with different geometries was investigated at different Reynolds numbers. The effects of design and operating characteristics such as mixing channel shape and volume flow rate were investigated. The main objective of this work was to demonstrate a process design method that uses on Computational Fluid Dynamics (CFD) for modeling and Additive Manufacturing (AM) technology for manufacture. The reactors were designed and simulated using SolidWorks and Fluent 15.0 software, respectively. Manufacturing of the devices was performed with an EOS M-series AM system.Step response experiments with distilled Millipore water and sodium hydroxide solution provided time-dependent concentration profiles. Villermaux-Dushman reaction experiments were also conducted for additional verification of CFD results and for mixing efficiency evaluation of the different geometries. Time-dependent concentration data and reaction evaluation showed that the performance of the AM-manufactured reactors matched the CFD results reasonably well. The proposed design method allows the implementation of new and innovative solutions, especially in the process design phase, for industrial scale reactor technologies. In addition, rapid implementation is another advantage due to the virtual flow design and due to the fast manufacturing which uses the same geometric file formats.
in Wiley Online Library (wileyonlinelibrary.com)Finite energy resources and their rapidly waning imprint necessitate a sustainable wastewater treatment method. Nature could be exploited to freeze wastewater in locations which experience subzero temperatures during winter. The two most vital components that influence the efficiency of natural freezing are the ambient temperature and air velocity. The turbulent and unsteady air-cooled natural freezing is simulated for ice crystallization from 0.1 wt % and 1 wt % NiSO 4 (aq) solutions. The efficiency of natural freezing is tested for different air velocities (2 ms 21 , 5 ms 21 ) and levels of undercooling (DT 5 0.58C, 18C) from the freezing temperature of the corresponding solution. The airflow in the winter simulator is modeled by computational fluid dynamics to investigate its behavior and to assess its effect on freezing.Symbol: • and -represents freezing test results with v 5 0.25 ms 21 and the linear relationship between G and K as obtained in our previous publication. 5 Symbol: o, represents freezing test results in the current setup as shown in Figure 1 with v 5 2 ms 21 ; 1, with v 5 5 ms 21 and *, with v 5 5.5 ms 21 after subduing the effect of vibration.
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