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A 50-mm-thick air gap separates two horizontal metal plates that form the top surface of an industrial furnace. The bottom plate is at Th = 200°C and the top plate is at Tc = 50°C. The plant operator wishes to provide insulation between the plates to minimize heat loss. The relatively hot temperatures preclude use of foamed or felt insulation materials. Evacuated insulation materials cannot be used due to the harsh industrial environment and their expense. A young engineer suggests that equally spaced, thin horizontal sheets of aluminum foil may be inserted in the gap to eliminate natural convection and minimize heat loss through the air gap.
(a) Determine the convective heat flux across the gap when no insulation is in place.
(b) Determine the minimum number of foil sheets that must be inserted in the gap to eliminate free convection.
(c) Determine the conduction heat flux across the air gap with the foil sheets in place.
a mass of 10-g of nitrogen is contained in a spring loaded piston cylinder. the spring constant is 1 knm and the piston
a crane is lifting concrete to a construction project where the acceleration of gravity is 31 fts2. if a 400 lbm
A laterally insulated fin 2.5 m long is initially at 60?C. The temperature of one end is suddenly increased to and maintained at 600?C while the temperature of the other end is maintained at 60?C.
the blood pressure is measured using a sphygmomanometer. the systolic pressure pressure when the heart is pumping and
As a software project manager in a company that specializes in the development of software for the offshore oil industry, you have been given the task of discovering the factors that affect the maintainability of the systems developed by your comp..
a fluid with a specific volume of 0.0012 m3kg flows at a velocity of 400 mmin through a 6 cm diameter pipe. further
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Enter the data into a spreadsheet. and construct a standard-additions plot of the data.
a powerplant is situated at an altitude of 1000 ft above sea level. flue gases enter the slack at 285 degree f and
The spring is compressed by the rod which is pinned to the lower end of the door and which passes through the swivel block at B. When () = 0, the spring is undeformed. Show that with the proper stiffness k of the spring, the door will be in equili..
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Water flows at a rate of .04 m^3/s in a .12 meter diameter pipe that contains a sudden contraction to a .06 m pipe. Determine the pressure drop across the contraction section. How much of this pressure difference is due to losses and how much is due ..
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