为了研究封闭单壁碳纳米锥(SWCNC)吸附氢性能,采用雷纳德-琼斯势(L-J)12:6势能模型和巨正则蒙特卡罗方法(GCMC),模拟了5种锥度封闭SWCNC的吸氢过程.在室温高压情况下,顶角分别为112.9°、83.6°、60.0°、38.9°、19.2&...为了研究封闭单壁碳纳米锥(SWCNC)吸附氢性能,采用雷纳德-琼斯势(L-J)12:6势能模型和巨正则蒙特卡罗方法(GCMC),模拟了5种锥度封闭SWCNC的吸氢过程.在室温高压情况下,顶角分别为112.9°、83.6°、60.0°、38.9°、19.2°,对应高度为0.48、0.65、0.62、0.96、1.28 nm的封闭SWCNC,内部与氢的结合能对应分别为0.187、0.165、0.166、0.148、0.103 e V时,得到最大氢吸附量质量分数分别为5.62%、6.47%、7.56%、6.87%、6.65%.结果表明封闭SWCNC的氢吸附量与结构有较大关系,优于在同等条件下的碳纳米管、富勒烯,在吸附存储方面有一定应用价值.展开更多
Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the rel...Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the relaxation time A1 and retardation time A2. The governing equations are simplified using the case of mild stenosis. Perturbation method is used to solve the resulting equations. The effects of non-Newtonian nature of blood on velocity profile, temperature profile, wall shear stress, shearing stress at the stenotsis throat and impedance of the artery are discussed. The results for Newtonian fluid are obtained as special case from this model.展开更多
文摘为了研究封闭单壁碳纳米锥(SWCNC)吸附氢性能,采用雷纳德-琼斯势(L-J)12:6势能模型和巨正则蒙特卡罗方法(GCMC),模拟了5种锥度封闭SWCNC的吸氢过程.在室温高压情况下,顶角分别为112.9°、83.6°、60.0°、38.9°、19.2°,对应高度为0.48、0.65、0.62、0.96、1.28 nm的封闭SWCNC,内部与氢的结合能对应分别为0.187、0.165、0.166、0.148、0.103 e V时,得到最大氢吸附量质量分数分别为5.62%、6.47%、7.56%、6.87%、6.65%.结果表明封闭SWCNC的氢吸附量与结构有较大关系,优于在同等条件下的碳纳米管、富勒烯,在吸附存储方面有一定应用价值.
文摘Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the relaxation time A1 and retardation time A2. The governing equations are simplified using the case of mild stenosis. Perturbation method is used to solve the resulting equations. The effects of non-Newtonian nature of blood on velocity profile, temperature profile, wall shear stress, shearing stress at the stenotsis throat and impedance of the artery are discussed. The results for Newtonian fluid are obtained as special case from this model.
