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The products of combustion from a burner are routed to an industrial application through a thin-walled metallic duct of diameter Di = 1 m and length L = 100 m. The gas enters the duct at atmospheric pressure and a mean temperature and velocity of Tm,i = 1600 K and um,i = 10 m/s, respectively. It must exit the duct at a temperature that is no less than Tm,o = 1400 K.
What is the minimum thickness of an alumina-silica insulation (kins = 0.125 W/m · K) needed to meet the outlet requirement under worst case conditions for which the duct is exposed to ambient air at Too = 250 K and a cross-flow velocity of V = 15 m/s?
The properties of the gas may be approximated as those of air, and as a first estimate, the effect of the insulation thickness on the convection coefficient and thermal resistance associated with the cross flow may be neglected.
Air enters a turbine operating at steady state with a pressure of 75 psi a temperature of 800°R and a velocity of 400ft/s. At the turbine exit the conditions are 15psi, 600°R and 100 ft/s. Heat transfer from the turbine to its surroundings takes plac..
An ideal Rankine cycle uses water as its working fluid. The mass flow rate of water through the cycle is 150 kg/s. saturated vapour enters the turbine at 15 MPa and saturated liquid enters the pump at 10 kPa. Cooling water passes through the condense..
a helicopter is ascending vertically with a speed of 5.78. at a height of 121 above the earth a package is dropped
determine the width w of the link bc needed so that the structure with load p 20 kips has a factor of safety equal to
Given that an activity's normal time and cost are 10 days and $400 and its crash time and cost are 5 days and $800, what is the activity's slope?
a racing boat planes over the water at 80 mph. the water temperature is 75f. the wetted surface of the boat i.e. the
the diffuser in a supersonic jet aircraft is a passage designed to reduce the velocity of the air passing through it
In air-conditioning systems, streams of cold and warm air are mixed to get air with the right temperature. Consider a mixing chamber into which cold air enters at 8 degree C and 100 kPa at a rate of 0.55 m3/s and warm air enters at 30 degree C and 10..
three children are standing on a 5x5-m raft. if the weights of the three children at points a b and c are 375 n 260 n
a heat pump with refrigerant-134 as the working fluid is used to keep a space at 25 celsius by absorbing heat from
A flywheel can be considered as being composed of a thin disc and a rim. The rim weighs 322 lb and has diameters of 24 in. and 30 in. The disc weighs 64.4 lb. Determine the mass moment of inertia about the centroidal axis about which the flywheel ..
steam is expanded in an adiabatic turbine from 3 mpa and 400 c to 30 kpa. the turbine generates 4947kw of power when
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