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A particular thermal system involves three objects of fixed shape with conduction resistances of R1 = 1 K/W, R2 = 2 K/W and R3 = 4 K/W, respectively. An objec- tive is to minimize the total thermal resistance Rtot asso- ciated with a combination of R1, R2, and R3. The chief engineer is willing to invest limited funds to specify an alternative material for just one of the three objects; the alternative material will have a thermal conductiv- ity that is twice its nominal value. Which object (1, 2, or 3) should be fabricated of the higher thermal con- ductivity material to most significantly decrease Rtot? Hint: Consider two cases, one for which the three ther- mal resistances are arranged in series, and the second for which the three resistances are arranged in parallel.
the performance of a device is defined as the ratio of the desired output to the required input and this definition can
an aluminium bottle weighs 10 kgs when empty and has an internal volume of 20 liters. it is filled with 5 kgs of
Experimental measurements of the convection heat transfer coefficient for a square bar in cross flow yielded the following values: Evaluate properties at 300 K and atmospheric pressure.
Air at 12 psia and 60F enters the jet engine of an aircraft flying at a velocity of 500 ft/s. Inlet area of the engine is 4 ft2. Exhaust gases leave the engine with a relative velocity of 900 ft/s. The fuel flow rate is only 2% of the mass flow rate ..
A lap joint needs to be designed using 20-mm diameter bolts to carry a load of 120 kN on the connecting plates. If the shear stress in each rivet is not to exceed 90 MPa, determine the number of bolts needed.
a 10 cm long circular pin kfin20 wmtimesk of 12-mm dia removes 53watts of heat from a hot base when the average
a 25-cm diameter rod is suspended horizontally in quiescent still air that is at 50degc. the rod is 250 cm long and is
A solid round aluminium rod (made of 6061-T6) has a mean yield strength Sy = 40.0 ksi with standard deviation of 4.0 ksi, the rod is to be subjected to a mean static axial load of P = 25 kip with a standard deviation of 2.5 kip.
1 air in a piston-cylinder assembly and modeled as an ideal gas undergoes two internally reversible processes in series
Using the formula in the hydrostatic relation, determine the pressure as a function of depth.The hydrostatic relation is: p+dgz=constant
A turbine receives air at 1500 K, 1000 kPa and expands it to 100 kPa. The turbine has an isentropic efficiency of 85%. Find the actual turbine exit air temperature and the specific entropy increase in the actual turbine.
an ideal steam power plant is designed to operate on the combined reheat and regenerative cycle and to produce a net
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