[流力]功課
聽說有人需要題目
1-3 What is the no-slip condition? What causes it?
1-8 Define stress, normal stress, shear stress, and pressure.
2-47 The clutch system shown in Fig. P2-47 is used
to transmit torque through a 3-mm-thick oil film with μ=0.38 Ns/m^2
between two identical 30-cm-diameter disks. When the driving shaft
rotates at a speed of 1450 rpm, the driven shaft rotates at 1398rpm.
Assuming a linear velocity profile for oil film, determine the
transmittes torque.
2-68 The composition of a liquid with suspended solid particles is
generally characterized by the fraction of solid particles either
by weight or mass C =m /m or by volume C =V /V where m
s,mass s m s,vol s m
is mass and V is volume. The subscripts s and m is solid and mixture
respectively. Develop an expression for the specific gravity of a
waterbased suspension in terms of Cs,mass and Cs, vol.
2-74 Some non-Newtonian fluids behave a Bingham plastic for which
shear stress can be expressed as τ=τ +μ(du/dr). For laminar
y
flow of a Bingham plastic in a horizontal pipe of radius R, the
velocity profile is given as u(r)=(△p/4μL)(r^2-R^2)+(τ /μ)(r-R),
y
where △p/L is the constant pressure drop along the pipe per unit length,
μ is the dynamic viscosity, r is the radial distance from the centerline,
and τ is the yield stress of bingham plastic. Determine (a) the shear
y
stress at the pipe wall and (b) the drag force acting on a pipe section
of length L.
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