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Computational Fluid Dynamics Approach to the Effect of Mixing and Draft Tube on the Precipitation of Barium Sulfate in a Continuous Stirred tank

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Chinese Journal of Chemical Engineering 2006年第6X期14卷 713-722页

作者：王正毛在砂杨超沈湘黔 Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Changsha Research Institute of Mining and Metallurgy Changsha 410012 China

The effect of mixing on the precipitation of barium sulfate in a continuous stirred tank is simulated numerically with different feeding location, feed concentration, impeller speed and residence time through solving the standard momentum and mass transport equations in combination with the moment equations for crystal population balance. The numerical method was validated with the literature data. The simulation results including the distribution of the local supersaturation ratio distribution in the precipitator, mean crystal size and coefficient of variation under different operating conditions compared well with experimental data in the literature. The effect of the presence of a draft tube on precipitation were also investigated, and it is suggested that the installation of a draft tube increased the mean crystal size, in general agreement with experimental work in the literature.

关键词： mixing, precipitation, stirred tank, computational fluid dynamics (CFD), numerical simulation, supersaturation

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MATLAB/Simulink Modeling and Experimental Resultsof a PEM Electrolyzer Powered by a Solar Panel

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Journal of Energy and Power Engineering 2016年第12期10卷 779-785页

作者： Mohamed Albarghot Mahmud Sasi Luc Rolland Department of Mechanical Engineering Memorial University of Newfoundland St. John's NL A1B 3X5 Canada Electrical and Computer Engineering Memorial University of Newfoundland St. John's NL A1B3X5 Canada

In this paper, the solar panels are used to power an electrolyzer to separate the water into hydrogen and oxygen gas. Theelectrical equivalent circuit for the proton exchange membrane electrolyzer was developed and implemented in MATLAB/Simulinkalong with the atmospheric hydrogen storage tank. The voltage （2 volt） and current （1 ampere） were supplied in a similar manner inorder to compare the simulated and experimental results. The hydrogen amount is calculated to be 7.345 （ml/min A） from the modelas well as the experimental set-up. The experimental and simulation results were matched.

关键词： Photovoltaic, DC/DC buck convertor, electrolyzer, hydrogen tank, MATLAB/Simulink.

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