This paper presents the results of exact solutions and numerical simulations of strongly-conductive and weakly-conductive magnetic fluid flows. The equations of magnetohydrodynamic (MHD) flows with different conductiv...This paper presents the results of exact solutions and numerical simulations of strongly-conductive and weakly-conductive magnetic fluid flows. The equations of magnetohydrodynamic (MHD) flows with different conductivity coefficients, which are independent of viscosity of fluids, are investigated in a horizontal rectangular channel under a magnetic field. The exact solutions are derived and the contours of exact solutions of the flow for magnetic induction modes are compared with numerical solutions. Also, two classes of variational functions on the flow and magnetic induction are discussed for different conductivity coefficients through the derived numerical solutions. The known results of the phenomenology of magnetohydrodynamics in a square channel with two perfectly conducting Hartmann-walls are just special cases of our results of magnetic fluid.展开更多
为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比...为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比热容和导热系数。结果表明，老化底排药剂20℃· min -1升温时 DSC 曲线的最大吸热峰温度和最大放热峰温度分别为253．52℃和437．54℃。基于 DSC 曲线和多项式拟合法得到了40～180℃温区间的比热容与温度的依变关系。老化底排药剂的比热容平均值和导热系数分别为0．9868 kJ· kg -1·℃-1和0．2292 W · m -1· K -1。未老化底排药剂的比热容平均值和导热系数分别为0．8887 kJ·kg -1·℃-1和0．4020 W·m -1·K -1。与未老化药剂相比，老化药剂的比热容增大约11％，而导热系数减小约43％。展开更多
文摘This paper presents the results of exact solutions and numerical simulations of strongly-conductive and weakly-conductive magnetic fluid flows. The equations of magnetohydrodynamic (MHD) flows with different conductivity coefficients, which are independent of viscosity of fluids, are investigated in a horizontal rectangular channel under a magnetic field. The exact solutions are derived and the contours of exact solutions of the flow for magnetic induction modes are compared with numerical solutions. Also, two classes of variational functions on the flow and magnetic induction are discussed for different conductivity coefficients through the derived numerical solutions. The known results of the phenomenology of magnetohydrodynamics in a square channel with two perfectly conducting Hartmann-walls are just special cases of our results of magnetic fluid.
文摘为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比热容和导热系数。结果表明，老化底排药剂20℃· min -1升温时 DSC 曲线的最大吸热峰温度和最大放热峰温度分别为253．52℃和437．54℃。基于 DSC 曲线和多项式拟合法得到了40～180℃温区间的比热容与温度的依变关系。老化底排药剂的比热容平均值和导热系数分别为0．9868 kJ· kg -1·℃-1和0．2292 W · m -1· K -1。未老化底排药剂的比热容平均值和导热系数分别为0．8887 kJ·kg -1·℃-1和0．4020 W·m -1·K -1。与未老化药剂相比，老化药剂的比热容增大约11％，而导热系数减小约43％。
