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Water flows on the inside of a steel pipe with an inner diameter of 2.5cm. The wall thickness is 2mm, and the convection coefficient on the inside is 500 W/m2oC. The convection coefficient on the outside is 12 W/m2oC. Calculate the overall heat transfer coefficient, U and comment on what is the most significant determining factor for U. If the pipe is covered with a layer of asbestos (k=0.18 W/moC) while still surrounded by a convection coefficient with h=12 W/m2oC, what is the critical insulation radius? Will the heat transfer increase or decrease by adding a layer of asbestos insulation with a thickness of a) 0.5 mm, b) 10 mm?
A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope 1:1 is to drain water uniformly at a rate of 8 m^3/s to a distance ok 1 km. If the flow depth is not to exceed 1.2 m,
A consolidated-undrained type of test is performed. The sample fails (shears) when the total all-around confirming pressure is 45 kpa and the total axial pressure is 97 kpa.
On average each student produces 1 kg of carbon dioxide per day. The recommended ventilation rate of fresh air to avoid excessive carbon dioxide buildup is 8 L per second per student.
The first pipe of 0.4-m diameter is 500 m long, the second pipe 600 m long, size 0.3 m, and the last pipe is 500 m long of diameter 0.2 m. If the elevation difference between two reservoirs is 30 m, calculate equivalent pipe size and flow in the p..
The Permeability of a semi-impervious soil was evaluated in a falling-head permeameter whose head decreased from 40 to 15 inches in 5min. The body diameter was 0.1 inch, and the sample length and diameter was 2 inches.
The initial conditions of the helium are 7 ft^3, 80 psia, and 100 F. The helium expands reversibly according to process PV^1.5=C until the pressure reaches 15 pisa.
The number of hours on each machine required to produce a product is given in the following table, along with the number of hours available per week on each type of machine. Assume that the company can sell everything it produces.
a particle moving along a straight path decelerates according to a = -kv. this represent a drag-induced deceleration. assume that the intial velocity is vo at t=0 and s = 0. determine the velocity of the particle both
a ceramic matrix composite contains internal flaws as large as 0.001 cm in length. The plane strain fracture toughness of the composite is 45 MPa sqr(m), and the tensile strength is 550 MPa.
The coal-fired boilder supplies 70 MW to the steam while thermal energy is rejected to a nearby lake whos average temperature is 15 C. What is the minimum required temperture of the boiler to meet the power demands of the city
Air (an ideal gas) enters an adiabatic nozzle at 3 bar and 38 C and exits at 1 bar and -0.78 C. The process is steady. If the velocity at the inlet is 1 m/s, determine the exit velocity and the ratio of the exit area to the inlet area.
Estimate the effective friction angle for the sand (assume c' = 0). Calculate the sand's shear strength (τf) on a horizontal plane at depths of the 20 ft and 50 ft.
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