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Consider the material processing experiment of Problem 5.24, with atmospheric nitrogen used to implement cooling by convection. However, instead of using a prescribed value of the convection coefficient, compute the coefficient from an appropriate correlation.
(a) Neglecting radiation, determine the time required to cool the sphere from 900°C to 300°C if the velocity and temperature of the nitrogen are V = 5 m/s and Too = 25°C.
(b) Accounting for the effects of both convection and radiation, with s = 0.6 and Tsur = 25°C, determine the time required to cool the sphere. Explore the effects of the flow velocity on your result.
water is the working fluid in an ideal rankine cycle. superheated vapor enters the turbine at 8 mpa 450 degc. the
A tension member made of 2014-T651 aluminium has a dimensions of b= 30 and t=4mm. A safety factor of 3.0 against failure by either brittle fracture or fully plastic yielding is required.
A steady-state, well insulated turbine operated in two stages in series using steam . The first stage has an efficiency of 85% and the second stage 90%. Steam enters the first stage at 400 C degree and 4 MPa and exits at 1.5 MPa.
estimate the amount of torque needed to actuate the knee near 0 deg flexion standing position based on the friction in
A J-type thermocouple with an ice-reference junction showed a reading of 22 mV. After the experiment it was found that the actual temperature of the reference junction was 4 °C instead of 0 °C. Calculate the actual value of the measured temperature.
an insualed piston-cylinder device contains 5 kg of satured mix of water initially at 100kpa and 6m3. now 3917kj of
water enters a steam generator as compressed liquid at 100 c 6mpa and exits as superheated vapor at 500 c 6mpa constant
Galvanized iron drainpipes of diameter 50 mm are located at the four corners of a building, but three of them become clogged with debris. Find the rate of downpour (cm/min) at which a single functioning drainpipe can no longer drain the roof.
Ferrous metal, nonferrous metal, steel and powdered metals are all examples of:
a string is stretched between rigid supports a distance l apart. it is driven by a force fcoswt located at its
Titanium has an hcp unit cell for which the ratio of the lattice parameters c/a is 1.58. If the radius of the Ti atom is 0.1445 nm. What is the unit cell volume? Calculate the density of Ti and compare it with the literature value?
Heat loss from an insulated pipe, a standard schedule 40, 2-in. steel pipe (inside diameter 2.067 in. and wall thickness 0.154 in.) carrying steam is insulated with 2 in. of 85% magnesia covered in turn with 2 in. of cork. Estimate the heat loss p..
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