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Electronic components are mounted on the inner surface of a horizontal cylindrical duct whose inner diameter is 0.2m. To prevent overheating of the electronics, the cylinder is cooled by a stream of air flowing through it and by convection from its outer surface. Air enters the duct at 25oC, 1 bar and a velocity of 0.3 m/s and exits at 40oC with negligible changes in kinetic energy and pressure. Convective cooling occurs on the outer surface to the surroundings, which are at 25oC, in accord with hA = 3.4 W/K, where h is the heat transfer coefficient and A is the surface area (the rate of cooling by convection is given by Q = hA(Ts-Tsurr)) . The electronic components require 0.2 kW of electric power. For a control volume enclosing the cylinder, determine at steady statea. The mass flow rate of the air, in kg/sb. The temperature on the outer surface of the duct, Ts, in oCc. The rate of entropy generation, in W/KAssume the ideal gas model for air.
If after 49.5 h the concentration of carbon is 0.35 wt% at a position 4.0 mm below the surface, determine the temperature at which the treatment was carried out.
Estimate the mass flow rate of fuel into the engine in kg/h.
Define dynamic viscosity, Determine the centroid, Pressure due to the height of liquid, Advantage of changing the liquid, Calculate the total moment about the hinge of the seal gate.
What is the wear coefficient of the bearing material in m2N-1 ?
Principles of Engineering Economic Analysis-Time value of money-use of gradient factor is expected
260-pound weight is supported by two ropes, one forming a 40 degree angle with the ceiling and the other a 50 degree. Find the tension in each rope.
The school cafeteria has found that they go through 9 sandwiches for every 6 tickets they sell to the students. Today they have 558 sandwiches available. How many lunch tickets can they sell today?
What is the mass of the lead weight, if 100 J of heat is lost from the water after the weight falls a distance of 3 m.
a force of 3 n stretches a spring by 1 m. a mass of 4 kg is attached to the spring. at t0 thenbspmass is pulled down a
Applied Loads, Young's modulus, Poisson's ratio, The Young's modulus and the Poisson's ratio for copper are 124.8 GPa and 0.36 respectively. When a tensile load is applie to a 1.5cm diameter copper rod
Refrigerant 134a leaves the evaporator as saturated vapor at 1.4bar and is heated at constant pressure to 20 degrees C before entering the compressor.
Two collars C and D move along the vertical rod as shown. Knowing that the velocity of collar C is 50 in/s downward, find the instant centers of all three bars, the angular velocity of AB, the velocity of collard D.
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