Question

流体力学英文题目(2)，高分悬赏

9.When the pipeinstallation changes from horizontal to vertical position and the velocitykeeps unchanged, the frictional loss will be .
A）. increased; B）. decreased; C）. the same; D）. uncertain
10.Fluid flows throughthe pipe at low flow rates, when the velocity rises in double time, thepressure drop in the fluid will( ).
11.For Newtonianfluids，if the typeof flow through the pipe is laminar flow，then its characteristics are:__________________________________；_______________________；________________________.
12.For given dust system the capacity of gravity settling chamber dependson ( )
A) The height and length ofchamber
B) height of chamber
C) The bottom area of chamber
D) Volume of chamber
13.For constant pressure filtration, if the filtering medium (septum)resistance is ignored, the filtering time is double and other operatingconditions keep unchanged, the filtrate volume will be （ ）
（A）double; (B) half of original; (C) 21/2 of original; (D) uncertain
14.The critical diameter implies for the performance of cyclone旋风分离器 .
(A) minimum diameter of particleremoved completely by cyclone
(B) diameter of cyclone for maximum separationefficiency
(C) maximum diameter of particle tomaintain laminar flow
(D) minimum diameter of particleleaving the cyclone

Answer 1

大致翻译一下，给你答案
9、当管道由水平变为垂直布置的时候，流速不变摩擦损失会怎样变化（B减少）
10、管道内流体在低速流动时（层流），当流速倍增时，压降损失会怎样（double，尼古拉斯公式）
11、对于牛顿流体，管道内流动为层流时，性质有：（符合牛顿内摩擦定律）（中间流速最大，向四周递减）（切应力与流速梯度的图象是过原点的直线）
12、对于给定的重力沉降室，其生产能力与什么有关（C与沉降室的底面积有关，与高度无关）
13、对于恒定压力过滤装置，如果其他条件不变，过滤时间变为两倍，则过滤体积为（C 根号2）
14、临界直径对于旋风分离器是什么意思（B 最大效率分离出来的最小粉尘粒子的直径(或当量直径)）