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11.24 A counterflow, concentric tube heat exchanger used for engine cooling has been in service for an extended period of time. The heat transfer surface area of the exchanger is 5 m2, and the design value of the overall convection coefficient is 38 W/m2 · K. During a test run, engine oil flowing at 0.1 kg/s is cooled from110°C to 66°C by water supplied at a temperature of 25°C and a flow rate of 0.2 kg/s. Determine whether fouling has occurred during the service period. If so, calculate the fouling factor, R"f (m2 · K/W).
a 30-ton engine exerts a constant horizontal force of 40103-lb on a train having three cars that have a total weight of
determine the microstructure for eutectoid steel that has undergone the following heat treatment. for each heat
A drawn, thin -walled tube has plastic (orthotropic) anisotropy. The axial direction of the tube is similar to the rolling direction of anisotropic sheet metal. The tube diameter is 3 inches and the wall thickness is 0.040 inch.
a hot wire anemometer is a device to measure the velocity of a flow of air. it consists of a thin cylindrical wire in
a garden hose attached with a nozzle is used to fill a 10-gallon bucket. the inner diameter of the hose is 2 cm and it
a centrifugal compressor delivers 20 kgs of air at 0.32 mnm2 when running at 17500 rpm and absorbing 2800 kw. the inlet
A thin spherica lshel'I has a radius of 1.90 m. An applied torque of 960 N.m gives the shell an angular acceleration of 6.20 rad/s2 about an axis through the center of the shell. What is rotational inertia of the shell about that axis?
Advanced Stress Analysis Assignment
A gas in a piston-cylinder assembly undergoes an expansion process for which the relationship between pressure and volume is given by pV^n = constant. The initial pressure is 4.25 bar, the initial volume is 0.25 m^3 and the final volume is 0.55 m^3 .
a piston-cylinder device contains 6 kg of h2 and 21 kg of n2 at 160 k and 5 mpa. heat is now transferred to the device
a certain object weighs 300 n at the earths surface. determine the mass of the object in kilograms and its weight in
consider an ocean thermal energy conversion power plant in hawaii designed to operate between temperature limits of
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