This paper presents a study of the concentration range of reartant of oscillation reaction in α-hydroxy-propionic acid-KBrO3-MnSO4-H2SO4-propanone system. The special feature of the reaction is a damped oscillation. ...This paper presents a study of the concentration range of reartant of oscillation reaction in α-hydroxy-propionic acid-KBrO3-MnSO4-H2SO4-propanone system. The special feature of the reaction is a damped oscillation. A section of the damped oscillation wave is similar to a spindle. Effects of many facstors on the oscillation have been examined.The period and amplitude as function of the initial concentration of each reactant have been studied. It was found that mumbers, period and amplitude of each section of damped oscillation and preoscillatory time depend on the initial concentrations of the reactants.展开更多
应用VOF(Volume of Fluid)方法结合不可压缩流体的N-S方程和连续性方程对矩形水池中的水面振荡流场进行数值模拟。采用共轭剩余法结合差分法求解N-S方程和连续性方程,采用施主-受主法求解流体体积函数控制方程。计算得到一个振荡周期内...应用VOF(Volume of Fluid)方法结合不可压缩流体的N-S方程和连续性方程对矩形水池中的水面振荡流场进行数值模拟。采用共轭剩余法结合差分法求解N-S方程和连续性方程,采用施主-受主法求解流体体积函数控制方程。计算得到一个振荡周期内典型时刻矩形水槽水面振荡流场分布情况并与理论分析结果进行比较。并将计算得到的前6个周期时刻的振荡流场自由面分布曲线进行比较。结果表明,数值模拟所得水面振荡流场演化过程符合理论规律,VOF方法能够较为精确地模拟水面振荡流场。展开更多
采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振...采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振荡幅度的衰减及振荡过程中水流流态的影响。结果表明:增大U形结构上游或者下游横截面积会增大水体振荡周期,特别是同时增大上游与下游横截面积,效果更加显著;当中间有压管道的长度增加到一定程度以后,增加横截面积对周期造成的影响趋于一致,可以拟合出相应的公式;增加横截面积,特别是同时增加上下游横截面积造成水体中产生较大的水流漩涡,增大局部水头损失,能显著加快水体振荡的衰减。展开更多
文摘This paper presents a study of the concentration range of reartant of oscillation reaction in α-hydroxy-propionic acid-KBrO3-MnSO4-H2SO4-propanone system. The special feature of the reaction is a damped oscillation. A section of the damped oscillation wave is similar to a spindle. Effects of many facstors on the oscillation have been examined.The period and amplitude as function of the initial concentration of each reactant have been studied. It was found that mumbers, period and amplitude of each section of damped oscillation and preoscillatory time depend on the initial concentrations of the reactants.
文摘应用VOF(Volume of Fluid)方法结合不可压缩流体的N-S方程和连续性方程对矩形水池中的水面振荡流场进行数值模拟。采用共轭剩余法结合差分法求解N-S方程和连续性方程,采用施主-受主法求解流体体积函数控制方程。计算得到一个振荡周期内典型时刻矩形水槽水面振荡流场分布情况并与理论分析结果进行比较。并将计算得到的前6个周期时刻的振荡流场自由面分布曲线进行比较。结果表明,数值模拟所得水面振荡流场演化过程符合理论规律,VOF方法能够较为精确地模拟水面振荡流场。
文摘采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振荡幅度的衰减及振荡过程中水流流态的影响。结果表明:增大U形结构上游或者下游横截面积会增大水体振荡周期,特别是同时增大上游与下游横截面积,效果更加显著;当中间有压管道的长度增加到一定程度以后,增加横截面积对周期造成的影响趋于一致,可以拟合出相应的公式;增加横截面积,特别是同时增加上下游横截面积造成水体中产生较大的水流漩涡,增大局部水头损失,能显著加快水体振荡的衰减。
