通过实验,研究了多孔介质布膜元件对水膜除尘器除尘效率的影响,讨论了进气量、用水量、气水比对除尘效率的作用效果。在此基础上,采用计算流体力学DPM模型,研究了进气量和颗粒粒径对除尘效率的影响。研究表明,在除尘实验中,采用多孔介...通过实验,研究了多孔介质布膜元件对水膜除尘器除尘效率的影响,讨论了进气量、用水量、气水比对除尘效率的作用效果。在此基础上,采用计算流体力学DPM模型,研究了进气量和颗粒粒径对除尘效率的影响。研究表明,在除尘实验中,采用多孔介质布膜元件可有效提高除尘效率,用水量越低,提高效果越明显;进气量和进水量对除尘效率具有显著的正向影响,但进气量的影响要大于进水量;不论是否存在多孔介质,除尘效率在气水比为21 m 3/kg达到最大值。模拟结果显示,在实验最大风量的条件下,对粒径94.55μm及以上的颗粒,具有100%的除尘效果;对于粒径68.58μm及以上的颗粒,能具有良好的除尘效率,数值可以在90%以上。展开更多
In this paper, wave focusing based on a coordinate transformation is proposed. It is known that the 2-dimensional wave equation which governs a shallow water problem in a potential theory can keep invariance under coo...In this paper, wave focusing based on a coordinate transformation is proposed. It is known that the 2-dimensional wave equation which governs a shallow water problem in a potential theory can keep invariance under coordinate transformation. Once equivalent medium parameters are obtained so as to keep the invariance, wave rays can be arbitrarily designed. We show the design of equivalent medium for wave squeezing to focus waves on a specific domain. Numerical computations are carried out by a finite element based software COMSOL Multiphysics. Results show good agreement between predictions from the theory and computations. It can be applied for a wide range of frequency because the proposed method is able to be applied regardless of the frequency.展开更多
文摘通过实验,研究了多孔介质布膜元件对水膜除尘器除尘效率的影响,讨论了进气量、用水量、气水比对除尘效率的作用效果。在此基础上,采用计算流体力学DPM模型,研究了进气量和颗粒粒径对除尘效率的影响。研究表明,在除尘实验中,采用多孔介质布膜元件可有效提高除尘效率,用水量越低,提高效果越明显;进气量和进水量对除尘效率具有显著的正向影响,但进气量的影响要大于进水量;不论是否存在多孔介质,除尘效率在气水比为21 m 3/kg达到最大值。模拟结果显示,在实验最大风量的条件下,对粒径94.55μm及以上的颗粒,具有100%的除尘效果;对于粒径68.58μm及以上的颗粒,能具有良好的除尘效率,数值可以在90%以上。
文摘In this paper, wave focusing based on a coordinate transformation is proposed. It is known that the 2-dimensional wave equation which governs a shallow water problem in a potential theory can keep invariance under coordinate transformation. Once equivalent medium parameters are obtained so as to keep the invariance, wave rays can be arbitrarily designed. We show the design of equivalent medium for wave squeezing to focus waves on a specific domain. Numerical computations are carried out by a finite element based software COMSOL Multiphysics. Results show good agreement between predictions from the theory and computations. It can be applied for a wide range of frequency because the proposed method is able to be applied regardless of the frequency.
