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Consider the cylindrical bales of hay in Problem 3.82. It is proposed to utilize the microbial energy generation associated with wet hay to heat water. Consider a 30-mm diameter, thin-walled tube inserted lengthwise through the middle of a cylindrical bale. The tube carries water at Too,i = 20°C with hi = 200 W/m2 · K.
(a) Determine the steady-state heat transfer to the water per unit length of tube.
(b) Plot the radial temperature distribution in the hay, T(r).
(c) Plot the heat transfer to the water per unit length of tube for bale diameters of 0.2 m D 2 m.
The weight of a water tank open to the atmosphere is balanced by a counterweight equidistant from the fulcrum. There is a 4-cm hole at the bottom of the tank, and water level in the tank is maintained constant at 50 cm by water entering the tank hori..
on the basis of the information given ,is it possiple to compute the magnitude of the load that is necessary to produce this change in length?
Compute and plot the variation of the rod temperature with time during the heating process - what is the initial rate of change of the rod temperature? Confirm the validity of the lumped capacitance approximation.
A fan accelerates air (at atmospheric pressure and 300K) from a rest to 5m/s. The fan mass flow rate of air is 1.2 kg/s. What is the minimum amount of power this fan must consume to operate under these conditions?
the stators in a gas turbine are designed to increase the kinetic energy of the gas passing though them adiabatically.
a household refrigerator with a cop of 1.2 removes heat from the refrigerated space at a rate of 60 kjmin. determine a
Steam at 5.0 MPa, 500 degrees C enters an insulated turbine operating at a steady state with a mass flow rate of 7kg/s and exits at 0.3 MPa. Kinetic and Potential energy effects are negligible. Determine the maximum theoretical power that can be deve..
a 10 m3 oxygen tank is at 15 degree c and 800 kpa. the valve is opened and some oxygen is allowed to escape until the
because of poor lubrification the pulley must overcome a constant friction moment of 12 nm as it rotates. assuming no
pure iron goes through a polymorphic change from bcc to fcc upon heating through 912degc. calculate the volume change
A structural steel bar with a 25 mm x60 mm rectangular cross section is subjected to an axial load of 160 kN. Determine the maximum normal and shear stresses in the bar.
a calculate the number of electrons in a small electrically neutral silver pin that has a mass of 8.0 g. silver has 47
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