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Consider refrigerant R-134a flowing in a smooth, horizontal , 10-mm-inner-diameter tube of wall thickness 2 mm. The refrigerant is at a saturation temperature of 15 C for which the vapor density is 23.75 Kg/m^3 at a flow rate of .01 Kg/s. Determine the maximum wall temperature associated with a heat flux of 10^5 w/m^2 at the inner wall of the tube at a location .4 m downstream from the onset of boiling for a tube fabricated of pure Copper.
a slab milling operation is performed on the top surface of a steel rectangular workpiece 12.0 in long by 2.5 in wide.
underground water is to be pumped by a 70 efficient 3-kw submerged pump to a pool whose free surface is 30 m above the
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D=1 mm, L= 2m, electrical resistivity rho=10^-6 ohms, thermal conductivity k=25W/mK, and emiss..
cylinder conditions at the start of compression in an si engine operating at wot on an air-standard otto cycle are 60
a block weighing 100 lbf sits on a 20ordm inclined surface. the coefficients of static and dynamic kinetic friction are
a lake can freeze even if the temperature is above freezing. assuming a gentle breeze wind produces a convective heat
compare the work required at steady state to compress water vapor isentropically to 3 mpa from the saturated vapor
if the atmospheric pressure is 1.025 bar at a location where you can dive in lake to 30 ft below the surface and then
steam enters a well insulated nozzle operating at steady state at 1000of and 500lbfin2 and velocity 10fts. at the
a capacitor is connected to an ac generator that has a frequency of 3.7 khz and produces a voltage of 1.4 v. the
Assuming the pulley is a uniform disk with a mass of 0.31 {rm kg}, find the speed of the block after it has fallen through a height of 0.50 {rm m}.
a thin-walled uninsulated 0.3m diameter duct is used to route chilled air at 0.05kgs through the attic of a large
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