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a steel strip emerges from the hot roll section of a steel mill at a speed of 20 ms and a temperature of 1200 k its
in fuel cell stacks it is desirable to operate under conditions that promote uniform surface temperatures for the
consider a rectangular fin that is used to cool a motorcycle engine the fin is 015 m long and at a temperature of
the weather channel reports that it is a hot muggy day with an air temperature of 90degf a 10 mph breeze out of the
air at a pressure of 1 atm and a temperature of 50degc is in parallel flow over the top surface of a flat plate that is
pin fins are to be specified for use in an industrial cooling application the fins will be subjected to a gas in cross
a pin fin of 10-mm diameter dissipates 30 w by forced convection to air in cross flow with a reynolds number of 4000 if
a long cylindrical electrical heating element of diameter d 10 mm thermal conductivity k 240 wm k density rho 2700
a circular pipe of 25-mm outside diameter is placed in an airstream at 25degc and 1-atm pressure the air moves in cross
the boundary layer associated with parallel flow over an isothermal plate may be tripped at any x-location by using a
air at 27degc with a free stream velocity of 10 ms is used to cool electronic devices mounted on a printed circuit
consider two very long straight fins of uniform cross section as shown in figure 317 the rectangular fin has dimensions
a fine wire of diameter d is positioned across a passage to determine flow velocity from heat transfer characteristics
consider the nichrome wire d 1 mm rhoe 10-6 omega m k 25 wm k epsilon 020 used to fabricate the air heater of
consider conditions for which a mercury-in-glass thermometer of 4-mm diameter is inserted to a length l through the
a 25-mm-diameter high-tension line has an electrical resistance of 10-4 omegam and is transmitting a current of 1000 aa
a computer code is being developed to analyze a temperature sensor of 125-mm diameter experiencing cross flow of water
to augment heat transfer between two flowing fluids it is proposed to insert a 100-mm-long 5-mm-diameter 2024 aluminum
an uninsulated steam pipe is used to transport hightemperature steam from one building to another the pipe is of 05-m
air at 25degc flows over a 10-mm-diameter sphere with a velocity of 25 ms while the surface of the sphere is maintained
consider a sphere with a diameter of 20 mm and a surface temperature of 60degc that is immersed in a fluid at a
a spherical workpiece of pure copper with a diameter of 15 mm and an emissivity of 05 is suspended in a large furnace
copper spheres of 20-mm diameter are quenched by being dropped into a tank of water that is maintained at 280 k the
for the conditions of problem 780 what are the terminal velocity and the tank height if engine oil at 300 k rather than
a preheater involves the use of condensing steam at 100degc on the inside of a bank of tubes to heat air that enters at