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1. Consider the packed bed of aluminum spheres described in Problem 5.12 under conditions for which the bed is charged by hot air with an inlet velocity of V = 1 m/s and temperature of Tg,i = 300°C, but for which the convection coefficient is not prescribed. If the porosity of the bed is s = 0.40 and the initial tem- perature of the spheres is Ti = 25°C, how long does it take a sphere near the inlet of the bed to accumulate 90% of its maximum possible energy?
2. The use of rock pile thermal energy storage systems has been considered for solar energy and industrial process heat applications. A particular system involves a cylindrical container, 2 m long by 1 m in diameter, in which nearly spherical rocks of 0.03-m diameter are packed. The bed has a void space of 0.42, and the den- sity and specific heat of the rock are p = 2300 kg/m3 and cp = 879 J/kg · K, respectively. Consider conditions for which atmospheric air is supplied to the rock pile at a steady flow rate of 1 kg/s and a temperature of 90°C. The air flows in the axial direction through the container. If the rock is at a temperature of 25°C, what is the total rate of heat transfer from the air to the rock pile?
draw the shear and bending-moment diagrams for the beam and loading shown and determine the maximum normal stress due to bending.
Model a cup of coffee as a closed system containing 1 lbm of pure water at constant pressure of 14.7 psia. Using your knowledge of the 2nd Law, prove that it would be impossible for coffee at room temperature of 70 °F to heat up to 120 °F by receivin..
incoming air flow of 200 m3h at a temperature of 20oc and a humidity ratio of 0.012 kgvkga is mixed in a chamber with
The rigid gate, is hinged at O and rests against a rigid support at B. What minimum horizontal force, P, is required to hold the gate closed if its width is 3.9 m? Neglect the weight of the gate and friction in the hinge. The back of the gate is e..
Two bars, one having a circular section of radius b, the other an elliptic section with semiaxes a,b. For equal angles of twist, which bar experiences the larger shearing stress?
A flat plate is sliding at a constant velocity on a large horizontal table. A thin layer of oil (of absolute viscosity = 0.48 N-s/m2) separates the plate from the table by a thickness of 0.15 cm. For shear stress in the oil layer of 0.1 psi, what is ..
Calculate the volume of water that is available for power generation at the extremes of spring and nap tides? If during the time the turbines are running, the level of the water in the bay is 2m higher that that in the sea, what is the potential ene..
water flows into a volume that contains a sponge with a flow rate of 0.02 m3s. it exits the volume through two tubes
KVL provides us with another way of arriving at a complete set of equations. There are three distinct loops in the circuit. Are There Any Tricks That Can Make This Easier?
In a non-flow process there is a heat loss of 1055kJ and an internal energy increase of 210kJ. How much work is done and is the process an expansion or compression?
Determine the required force F applied to the handle at A and the magnitude of the pin reaction at O. Note that the plunger passes through a vertically-elon- gated hole in the handle at B, so that negligible vertical force is transmitted there.
two pieces of shafting 1-in. diameter are in line with each other and are joined together at the point where their ends
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