Chapter 5: Problem 91
Distinguish between shaft work and other kinds of work associated with a flowing fluid.
Chapter 5: Problem 91
Distinguish between shaft work and other kinds of work associated with a flowing fluid.
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Get started for freeMolten plastic at a temperature of \(510^{\circ} \mathrm{F}\) is angered through an extruder barrel by a screw oscupying \(s\) of the tarrel's volume (Fig. \(P 5.16\) ). The extruder is \(16 \mathrm{ft}\) long and has an inner dianeter of 8 in. The barrel is connected to an adspter having a volume of \(0.48 \mathrm{ft}^{3} .\) The adapter is then connected to a die of equal volume. The plastic exiting the die is immediately rolled into sheets. The line is producing 4 -ft widths of material at a rate of \(30 \mathrm{ft} / \mathrm{min}\) and a gauge thickness of 187 mil. What is the axial velocity, \(V_{1},\) of the plastic in the barrel' Assume that the plastic density is constant as it solidifies from a liquid (in the extruder) into a solid sheet.
Storm sewer backup causes your basement to flood at the steady tate of 1 in. of depth per hour. The basement floor area is \(1500 \mathrm{ft}^{2}\) What capacity (gal/min) pump would you rent to (a) kecp the water eccumulated in your basement at a constant level urtil the storm sewer is blocked off. and (b) reduce the water accumulation in ycur basement at a rate of 3 in fhr even while the backup problem exiss?
Water enters a pump impeller radially, It leaves the impeller with a tangential component of absolute velocity of \(10 \mathrm{m} / \mathrm{s}\). The impeller exit diameter is \(60 \mathrm{mm}\), and the impeller speed is \(1800 \mathrm{rpm}\). If the stagnation pressure rise across the impeller is 45 kpa, determine the loss of available energy across the impeller and the hydraulic efficiency of the pump.
Calculate the kinetic energy correction factor for each of the following velocity profiles for a circular pipe: (a) \(u=u_{\max }\left(1-\frac{r}{R}\right)\) (b) \(u=u_{\max }\left(1-\frac{r^{2}}{R^{2}}\right)\) (c) \(u=u_{\max }\left(1-\frac{r}{R}\right)^{1 / 7}\)
\( \mathrm{A}\) small fan moves air \(\mathrm{x}\), a mass flowrate of \(0.004 \mathrm{lbm} / \mathrm{s}\) Upstream of the fan, the pipe diameter is 2.5 in.., the flow is laminar, the velocity distribution is parabolic, and the kinetic energy coefficient, \(a_{1},\) is equal to \(2.0 .\) Downstream of the fan, the pipe diameter is 1 in. the flow is turbulent, the velocity profile is quite flat, and the kinetic energy coefficient, \(a_{2},\) is equal to \(1.08 .\) If the rise in static pressure across the fan is 0.015 psi and the fan shaft draws 0.00024 hp, compare the value of loss calculated: (a) assuming uniform velocity distributions, (b) considering actual velocity distributions.
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