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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?
A confined quantity of air undergoes two thermodynamic processes departing from an initial equilibrium state where the temperature is 20°C, the absolute pressure is 1bar, and the volume is 0.2m3.
determine the average punching shear stress the circular shaft creates in the metal plate through section ac and bd.
Evaluate the relative merits of each system in terms of cost, ease-of-use, flexibility, range, field of view, etc. In each case, provide an example application where the method has/can be used in either automated, or manual manufacturing.
select a steel for use in high-pressure cylindrical containment vessels for the next generation of nuclear submarines.
ater is the working fluid in a regenerative rankine cycle. the pressure andnbsptemperature at the turbine inlet are
Assume that the center of masses of the upper arm and the forearm acts in the geometric center of the respective body segment, and the center of mass of the hand acts at the same location that the cable is in the hand (given below). If the person is ..
(a) What is the average speed of a man? (b) What is the average velocity of a man?
a 0.5-m3 vessel contains 10 kg of refrigerant-134a at -20oc. determine a the pressure b the total internal energy and c
Briefly explain the term engineering mechanics and give complete classification of engineering mechanics - Find the smaller force - Explain the terms mass and weight and also differentiate between them.
An 8-kg plunger is released from rest in the position shown and is stopped by two nested springs; the constant of the outer spring is k1 = 4 kN/m and the constant of the inner spring is k2 = 12 kN/m. If the plunger is released from the height
derive shear modulus g or bulk modulus k of isotropic materials in terms of youngs modulus e and poissons ratio v. use
helium initially at 160degf and 30 psia is slowly withdrawn from a well-insulated rigid tank of volume 7 ft2 until the
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