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A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.10 and 0.15 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmos- pheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 70 and 30°C, respectively, what is the convective heat loss per meter of tube length across the air space?
1. assuming that the diameters of 1000 brass plugs taken consecutively from a machine form a normal distribution with
Report on High speed machining on duplex stainless steel. In that report I need literature review on High speed machining.
Solve the Navier-Stokes equation for the velocity profile in a thin tube of radius R under a constant pressure gradient dP / dx along its axis. The inner surface of the tube is super hydrophobic, and the slip boundary u(R) = -?(du/dR) should be adopt..
In a tubular low pressure chemical vapor deposition (LPCVD) reactor, gas is introduced at one end at a rate of 75 torr-L/min. At the other end is a vacuum pump of a speed Sp. If the reactor must operate at 1 torr, what value of Sp is required?
A unidirectional, continuously reinforced glass fiber composite has Vf=60 volume percent fibers in a matrix of epoxy. Glass has a Young's Modulus of E glass =70 GPas ; epoxy has a Young's Modulus of E epoxy = 2 GPas. Give numerical values for the Yo..
air enters an insulated diffuser operating with steady flow and at steady state with a pressure of 0.7 bar a
two pieces of shafting 1-in. diameter are in line with each other and are joined together at the point where their ends
You can transform a long bar of stainless steel from an initial 25 mm in diameter to 23 mm diameter by either machining or by drawing. Compare quantitatively the amount of work needed in these two cases.
a four-cylinder spark ignition engine has a compression ratio of 8 and each cylinder has a maximum volume of 0.6l. at
Calculate the stress state in the wall of a thin-walled spherical pressure vessel in terms of the internal pressure, p, the sphere radius, r, and the wall thickness, t.
The 60-mm diameter shaft rotates at 300 rev/min. this motion is caused by the unequal belt tensions on the pully of 800 N and 450 N. Determine the power transmitted and the maximum shear stress developed in the shaft.
wind is blowing on a 55-gallon drum. estimate the wind speed needed to tip the drum over. work in si units. the mass of
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