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An annular aluminum fin of rectangular profile is attached to a circular tube having an outside diameter of 25 mm and a surface temperature of 250°C. The fin is 1 mm thick and 10 mm long, and the temperature and the convection coefficient associated with the adjoining fluid are 25°C and 25 W/m2 · K, respectively.
(a) What is the heat loss per fin?
(b) If 200 such fins are spaced at 5-mm increments along the tube length, what is the heat loss per meter of tube length?
A low pass butter worth filter has a corner frequency of 1 khz and a roll-off of 24 db per octave in the stop band. If the output amplitude of a 3 khz sine wave is .1 V, what will be the output amplitude of a 20 khz sine wave if the input amplitudes ..
the boat is to be pulled onto shore using two ropes. If the resultant force is to be 1000 N, directed along the keel aa , determine the magnitude of forces T, P acting in each rope at the angle teta of P so that the magnitude of P is minimum. T ac..
steam enters a turbine at 9 mpa and 500 celcius with a velocity of 50 ms and leaves at 20 kpa with a quality of 90
A steam turbine receives a steam flow of 1.35 kg/s and the power output is 500 kW. The heat loss from casing is negligible. Calculate The change of specific enthalpy across turbine when the velocities at entrance and exit and the difference in elevat..
a piston cylinder device initially contains 5kg of water at saturated liquid state1. it undergoes a process in which it
the cooling water flow rate to the condensers of a big coal-fired power plant is 8460 kgs. the water enters the
a two phase liquid-vapor mixture of h2o is initially at 2.0 mpa with a quality of 90 is contained in a rigid well
Define and give the dimensions of thermal conductivity k, thermal diffusivity a,heat capacity C, heat flux q, and combined energy flux e. For the dimensions use m = mass, I = length, T = temperature, and t = time.
a frictionless piston cylinder device contains 5kg of air at 200kpa and 25 degree c. the air is compressed slowly to a
The hull of a boat has a volume of 150 m3, and the total mass of the boat when empty is 8560 kg. Determine how much load this boat can carry without sinking (a) in a lake and (b) in seawater with specific gravity of 1.03.
air flows into the narrow gap of height h between closely spaced parallel disks through a porous surface as shown. use
when a disk rolls on a surface without slip the velocity of the point of contact of the disk with the surface is zero
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