以红薯-蔗糖固液体系为研究对象,研究了在超声场作用下,超声输出功率、超声作用时间、渗透液浓度及温度、物料厚度等因素对红薯脱水率及固形物得率的影响.在此基础上,确定了渗透脱水过程的扩散系数,并对渗透脱水过程的数学模型进行了探...以红薯-蔗糖固液体系为研究对象,研究了在超声场作用下,超声输出功率、超声作用时间、渗透液浓度及温度、物料厚度等因素对红薯脱水率及固形物得率的影响.在此基础上,确定了渗透脱水过程的扩散系数,并对渗透脱水过程的数学模型进行了探讨.结果表明,超声场空化作用显著强化了红薯渗透脱水过程的质量传递,且在一定实验范围内,红薯脱水率及固形物得率均随超声输出功率、超声作用时间、渗透液浓度及温度的增加而增加,随着物料厚度的增大而减小.故可得到当超声场输出功率为93 W,声空化强化时间为25 m in,渗透液浓度在40%,温度在30℃,物料厚度为6 mm时为最佳操作条件.展开更多
In this study,the separation and coalescence of oil-in-water emulsions are explored in an ultrasonic field using the lattice Boltzmann method.By simulating the propagation of ultrasonic waves,this study focuses on exa...In this study,the separation and coalescence of oil-in-water emulsions are explored in an ultrasonic field using the lattice Boltzmann method.By simulating the propagation of ultrasonic waves,this study focuses on examining the effects of acoustic wave frequency,the ratio of oil to water components,and the aspect ratio of the boundary on the emulsification and separation processes of oil-water mixtures.The following conclusions are drawn.①Frequency affects the speed of oil droplet separation,leading to an increase in droplet size over time.Larger droplets are found near the source,while smaller droplets are distributed throughout the wave web.②As the boundary aspect ratio increases,the emulsification efficiency of the droplets weakens,and the system takes longer to stabilize.③Emulsions with a higher component of oil can better resist acoustic waves.④At the same acoustic frequency,longer wavelength ultrasonic fields promote the formation of uniformly distributed,smaller oil droplets,which is beneficial to the storage of emulsions.These numerical simulation results offer insights for optimizing conditions for oil-in-water separation and serve as a numerical reference for the study of oil-in-water emulsion separation in ultrasonic environments.展开更多
文摘以红薯-蔗糖固液体系为研究对象,研究了在超声场作用下,超声输出功率、超声作用时间、渗透液浓度及温度、物料厚度等因素对红薯脱水率及固形物得率的影响.在此基础上,确定了渗透脱水过程的扩散系数,并对渗透脱水过程的数学模型进行了探讨.结果表明,超声场空化作用显著强化了红薯渗透脱水过程的质量传递,且在一定实验范围内,红薯脱水率及固形物得率均随超声输出功率、超声作用时间、渗透液浓度及温度的增加而增加,随着物料厚度的增大而减小.故可得到当超声场输出功率为93 W,声空化强化时间为25 m in,渗透液浓度在40%,温度在30℃,物料厚度为6 mm时为最佳操作条件.
基金the National Natural Science Foundation of China(Program Nos.12161058,61962051,and 12361096)the Science and Technology Plan Project of Qinghai Province-Applied Basic Research Plan(No.2023-ZJ-736)the Open Project of State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University(No.2021-ZZ-02).
文摘In this study,the separation and coalescence of oil-in-water emulsions are explored in an ultrasonic field using the lattice Boltzmann method.By simulating the propagation of ultrasonic waves,this study focuses on examining the effects of acoustic wave frequency,the ratio of oil to water components,and the aspect ratio of the boundary on the emulsification and separation processes of oil-water mixtures.The following conclusions are drawn.①Frequency affects the speed of oil droplet separation,leading to an increase in droplet size over time.Larger droplets are found near the source,while smaller droplets are distributed throughout the wave web.②As the boundary aspect ratio increases,the emulsification efficiency of the droplets weakens,and the system takes longer to stabilize.③Emulsions with a higher component of oil can better resist acoustic waves.④At the same acoustic frequency,longer wavelength ultrasonic fields promote the formation of uniformly distributed,smaller oil droplets,which is beneficial to the storage of emulsions.These numerical simulation results offer insights for optimizing conditions for oil-in-water separation and serve as a numerical reference for the study of oil-in-water emulsion separation in ultrasonic environments.
