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It has been suggested that heat transfer from a surface can be augmented by wetting it with water. As a spe- cific example, consider a horizontal tube that is exposed to a transverse stream of dry air. You may assume that the tube, which is maintained at a temper- ature Ts > Too, is completely wetted on the outside with a thin film of water. Derive an equation to determine the extent of heat transfer enhancement due to wetting. Evaluate the enhancement for V = 10 m/s, D = 10 mm, Ts = 320 K, and Too = 300 K.
Write a mat lab code to calculate and plot the second explosion limit (2k1=k9[m] for the H2- air mixture with Phi=0.5 within temperature range of 500-1000k compare the line with the explosion limit in the textbook and see if they qualitatively agree...
an air-standard diesel cycle is operated with a compression ratio odf 20. the heat input is 300 btulbm. at the
most of the energy we consume as food is converted to thermal energy in the process of performing all our bodily
At the instant shown, the rigid body OA rolls counter clockwise without slipping on the fixed horizontal surface, and point O has a velocity 2 m/s to the left and an acceleration of 1 m/s2 to the right. Point O is at the center of the semi-circle reg..
A vertical piston- cylinder assembly contains 0.6 kg of air (K=1.4, R= 287J/Kg.K) initially at 110 KPa and 27 C (state 1). The air is first compressed isentropic ally to a temperature of 117 C ( state 2) which is followed by a constant pressure expan..
a high-strength steel has a yield strength of 1510 mpa and a k ic of 93 mpa-m12. calculate the smallest size of a
A copper wire, 5 mm in diameter and 15 ft long, has a voltage drop of 0.6 volts. Find the maximum temperature in the wire if the ambient air temperature is 25°C and the heat transfer coefficient h is 5.7 Btu/hr · ft2 · F.
A car is driven along a straight track with position given by s(t) = 150t – 300 ft (t in seconds). Find v(t) and a(t). Use calculus to find the displacement and total distance traveled over the interval [1, 4].
A large manufacturing space with an average floor to ceiling height of 30 ft has a floor area of 5000 ft^2. The total infiltration rate for the space is estimated to be 1.5 air changes per hour. The inside design temperature and relative humidity are..
Due to drought, the water level of a 10-acre pond is five feet below normal. If you wanted to fill the pond to normal capacity by using a hose connected to your kitchen faucet, how long would it take to fill the pond? Select an appropriate unit of ti..
water vapor exists at a pressure of 10kpa and temperature of 373k. assume a reference atmosphere exists at to 298k and
propane gas enters a continuous adiabatic heat exchanger at 40degc and 250 kpa and exits at 240degc superheated steam
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