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A circuit board with a dense distribution of integrated circuits (ICs) and dimensions of 120 mm × 120 mm on a side is cooled by the parallel flow of atmospheric air with a velocity of 2 m/s.
From wind tunnel tests under the same flow conditions, the average frictional shear stress on the upper surface is determined to be 0.0625 N/m2. What is the allowable power dissipation from the upper surface of the board if the average surface temperature of the ICs must not exceed the ambient air temperature by more than 25°C? Evaluate the thermophysical properties of air at 300 K.
Assess the effect of surface temperature on the power requirement, as well as on the relative contributions of convection and radiation to heat transfer from the surface.
a steel beam of i section is 300mm deep. each flange is 200mm wide and 50mm thick. the web is 50mm thick. the section
Two blocks A and B, of mass 5 kg and 6kg respectively, are connected by a cord which passes over pulleys as shown. A collar C, of mass 4kg, is placed on block and the system is released from rest. After the blocks have moved through 0.9m, collar C..
For the flow of a thin film of a liquid with a depth h and a free surface, two important dimensionless parameters are the Froude number, and the Weber number
in an oil refinery methane gas ch4 enters a compressor at a steady rate of 0.9 kgs and at a pressure 2 bar temperature
One of the Wright Brothers' contributions to the development of flight dealt with the design of the propeller. Research what the contribution was and how it was (and is) applies
The electronic components of a computer are cooled by air flowing through a fan mounted at the inlet of the electronic enclosure. At steady state, air enters at 18 C, 1 atm. For noise control, the velocity of the entering air cannot exceed 0.9 m/s.
question 1 briefly describe the meaning of the term mechatronics both in terms of the systems approach and the
The L76 × 76 × 12:7 angle section is used as a cantilever column of length L. Find the maximum allowable value of L if the column is not to buckle when the 12-kN axial load is applied. Use E = 200 GPa.
Air undergoes a polytropic process in a piston cylinder from p1=1bar, T1=295K to p2=7bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.6, determine the work and heat transf..
By sketching root locus, discuss whether the plant can be stabilized using
the fracture strength of glass may be increased by etching away a thin surface e layer. it is believed that the etching
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