为研究颗粒浓度对离心泵性能及磨损的影响规律,采用CFD-DEM(Computational Fluid Dynamics-Discrete Element Method)对离心泵内部固液两相流进行数值计算。通过监测过流部件的磨损率和颗粒的运动,分析了不同颗粒浓度时叶片的磨损率、...为研究颗粒浓度对离心泵性能及磨损的影响规律,采用CFD-DEM(Computational Fluid Dynamics-Discrete Element Method)对离心泵内部固液两相流进行数值计算。通过监测过流部件的磨损率和颗粒的运动,分析了不同颗粒浓度时叶片的磨损率、颗粒的平均速度、颗粒与壁面的接触次数和接触力。研究结果表明:随着浓度的增加,扬程和效率减小,叶轮的磨损率增大,叶片比前后盖板更易被磨损,叶片的磨损区域由点状衍变为片状;当颗粒浓度为3%时,颗粒在叶轮内运动时间最长,导致接触次数、接触力和接触区域最大;接触力较大的区域在叶片中间位置,颗粒与吸力面之间的冲击角接近90°,导致不同浓度下吸力面中间磨损最严重。展开更多
The rheological characteristic of soy protein isolate(SPI),is one of the most important properties in its application in food industry.The effects of different concentrations of guar gum(GG,polysaccharide)and sodium c...The rheological characteristic of soy protein isolate(SPI),is one of the most important properties in its application in food industry.The effects of different concentrations of guar gum(GG,polysaccharide)and sodium chloride(salt ion)on the rheological properties of SPI were studied in this research.Steady-state shear,strain sweep and frequency sweep tests(static and dynamic rheological tests)were performed,and the following phenomenon and conclusions were drawn:(1)The viscosity of the hybrid system increases with the GG addition.This trend could also be seen with the appropriate adding of salt ion;(2)As the applied frequency increases,the storage modulus G′and the loss modulus G″of the hybrid system increase at a similar rate.And the frequency sweep parameters of the hybrid system rise significantly with the increase of both GG and ionic concentration;The frequency dependence of the system varies significantly with the addition of salt ion;(3)With the concentration of the salt ion increase,the storage module G′of the hybrid system decrease indicating that salt ion destroyed the network structure of hybrid dispersion to a certain extent.展开更多
文摘为研究颗粒浓度对离心泵性能及磨损的影响规律,采用CFD-DEM(Computational Fluid Dynamics-Discrete Element Method)对离心泵内部固液两相流进行数值计算。通过监测过流部件的磨损率和颗粒的运动,分析了不同颗粒浓度时叶片的磨损率、颗粒的平均速度、颗粒与壁面的接触次数和接触力。研究结果表明:随着浓度的增加,扬程和效率减小,叶轮的磨损率增大,叶片比前后盖板更易被磨损,叶片的磨损区域由点状衍变为片状;当颗粒浓度为3%时,颗粒在叶轮内运动时间最长,导致接触次数、接触力和接触区域最大;接触力较大的区域在叶片中间位置,颗粒与吸力面之间的冲击角接近90°,导致不同浓度下吸力面中间磨损最严重。
基金supported by the Research Foundation for Youth Scholars of Beijing Technology and Business University(QNJJ2016-17)supported by the National Natural Science Foundation of China(31301593)Research and Development Fund for University’s Doctoral Discipline of China(20130008120021).
文摘The rheological characteristic of soy protein isolate(SPI),is one of the most important properties in its application in food industry.The effects of different concentrations of guar gum(GG,polysaccharide)and sodium chloride(salt ion)on the rheological properties of SPI were studied in this research.Steady-state shear,strain sweep and frequency sweep tests(static and dynamic rheological tests)were performed,and the following phenomenon and conclusions were drawn:(1)The viscosity of the hybrid system increases with the GG addition.This trend could also be seen with the appropriate adding of salt ion;(2)As the applied frequency increases,the storage modulus G′and the loss modulus G″of the hybrid system increase at a similar rate.And the frequency sweep parameters of the hybrid system rise significantly with the increase of both GG and ionic concentration;The frequency dependence of the system varies significantly with the addition of salt ion;(3)With the concentration of the salt ion increase,the storage module G′of the hybrid system decrease indicating that salt ion destroyed the network structure of hybrid dispersion to a certain extent.
