摘要
在分析非牛顿流体管内滑移流动机理的基础上 ,提出了通过计算水煤膏管内流动广义雷诺数Reg 来确定其阻力损失的方法。分析结果表明 :广义雷诺数不仅适用于管内存在滑移的非牛顿流体流动 ,同样适用于无滑移的非牛顿和牛顿流体流动。试验结果表明 :水煤膏管内定常流动的临界雷诺数约为 2 10 0 ;层流区采用广义雷诺数的沿程阻力系数的计算公式类似于牛顿流体的简单形式 ,即λ =6 4 /Reg;过渡区的阻力损失近似满足布拉休斯方程 ,λ =0 .316Re-0 .2 5g 。
Based on the analysis of slip flow mechanism in a non-Newtonian fluid pipe the authors have come up with a method for determining the resistance losses of coal water paste through the calculation of a generalized Reynolds number Reg for the in-pipe flow of coal water paste. The results of an analysis indicate that the generalized Reynolds number is suitable not only for non-Newtonian fluid flow with slip being present in a pipe, but also suited for non-Newtonian and Newtonian fluid flow without a slip. Test results show that the critical Reynolds number of the steady flow of coal water paste in the pipe is approximately 2100. The formula for calculating resistance factors for laminar flow zones with the use of a generalized Reynolds number is similar to the simplified form for Newtonian fluid, namely, λ=64 Re g. The resistance loss at a transition zone can approximately satisfy Blasius equation, namely,λ=0.316Reg^(-0.25).
出处
《热能动力工程》
CAS
CSCD
北大核心
2004年第3期260-264,共5页
Journal of Engineering for Thermal Energy and Power
关键词
水煤膏
广义雷诺数
滑移现象
阻力特性
coal-water paste, generalized Reynolds number, resistance characteristics, slip phenomena
