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Question: The upper and lower surfaces of a triangular fin of length 90 mm transfer heat with a coefficient h = 200 W/m2 ·K to an ambient at temperature T∞ = 20 °C. The base temperature of the fin is maintained at T0 = 120 °C (Fig.). The thermal conductivity of the fin material is k = 50 W/m·K. Write the finite-difference formulation of the problem by considering a nodal spacing of 15 mm. Determine the tip temperature of and the heat transfer to the fin, and the efficiency of the fin, by the method of iteration.
Consider a NACA 0009 airfoil that has a plain flap whose length is 0.2c and which is deflected 25. a. Calculate cl and cmc/4 When the geometric angle of attack is 4 degrees, what is the section lift coefficient? Where is the center of pressure?
A rectangular sharp-crested weir is used to measure the flowrate in a channel of width 10 ft. It is desired to have the upstream channel flow depth be 6 ft when the flowrate is 50 cfs.
During a hot summer day at the beach when the air temperature is 30°C, someone claims the vapor pressure in the air to be 5.2 kPa. Is this claim reasonable?
An object whose mass is 400 kg is located at an elevation of 25 m above the surface of the earth. For g 5 9.78 m/s2, determine the gravitational potential energy of the object, in kJ, relative to the surface of the earth.
Air enters a compressor at 105 kPa and 300 K with a volumetric flow rate of 12 m3 /min and exits at 1200 kPa and 400 K. Heat transfer occurs at a rate of 2 kW from the compressor to its surroundings. Assuming ideal-gas behavior for air, steady flow, ..
at a ski resort water at 40 f is pumped through a 3-in diameter 2000ft long steel pipe from a pond at an elevation of
Calculate the expected evaporation rate (kg/h · m2) for a test with water and air under the foregoing conditions, using the known value of DAB for the vapor-air mixture.
a what is the relative humidity rh of an air parcel with temperature 25degc and absolute humidity 8 gm3? see class 4
a system consisting of 3 lb of water vapor in a piston- cylinder assembly initially at 350degf and a volume of 71.7 ft3
a stainless steel tube of 1 cm outer diameter and 1mm wall thickness receives a uniform radiative heat flux of 100 wcm2
metals are usually crystalline and seldom amorphous. most ceramics are crystalline but there are significant examples
Use a well labeled block diagram to show the General structure of measurement system. - Show the input and output.
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