Research On Microfluidic Control In Extraterrestrial Artificial Photosynthesis Device

The extraterrestrial artificial photosynthesis device is an important device for survival on Mars in the future to provide the oxygen and fuel needed to maintain human survival.At present,the Sabatier reduction method is mainly used in the world to re-electrolyze water or the traditional industrial system device high-temperature chemical reduction and high-temperature electrolysis of carbon dioxide conversion methods Mainly,but the reaction conditions are harsh and the energy consumption is huge;there is no corresponding research report on the development of in-situ resource utilization devices in China,and there is still a big gap compared with the international level.Therefore,this research uses artificia l photosynthesis technology as the in-situ resource Utilization,the use of microfluidic technology to precisely control the flow state of carbon dioxide and electrolyte,so that the reaction rate and reflection efficiency have been greatly improved,and i t has the characteristics of low energy consumption and high efficiency.First,use COMSOL5.6 software to draw flow pattern diagrams at different gas-liquid flow rates,choose Taylor flow as the reaction flow pattern,establish a mathematical model of bubble generation and flow,and a pressure-driven mathematical model,and explore the The relevant change parameters of the Taylor unit under the liquid flow rate and the change of the bubble movement in the pipeline.Then,using simulation to analyze the reaction conditions under different bubble operating states,observe the simulation cloud diagram of the reaction,use the liquid phase mass transfer coefficient,specific surface area and defined mass transfer rate parameters to analyze the reaction situation,and then integrate the physical flow The corresponding conclusion has a preliminary parameter combination.Because of the pressure drive,precise control of pressure is the basis for the stable operation of the reaction.Therefore,the electromagnetic pr oportional pressure reducing valve is used to mathematically model the proportional pressure reducing valve,and the Matlab/Simulink module is used to build the pressure reducing valve model.Conducted open-loop and closed-loop simulations,tested under different inlet pressures,outlet pressures and flow rates,and finally solved the problem of excessive pressure difference controlled by the two-way valve separately by establishing a stable control strategy for the two-way valve differential pressure.Finally,the structure of the microchip was designed,the materials of the related parts were determined,and the experimental platform was built.According to the simulation results above,the impedance analyzer was used to test the experiment.It was finally determined that the gas flow velocity was 0.083m/s,and the liquid flow velocity was 0.083m/s.It is 0.167m/s and the response state is best when the voltage value is set to 3.1V,and the simulation results are consistent with the experimental results.