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1. In many cases, we are concerned with free convection involving gases that are contained within sealed enclo- sures. Consider air at 27°C and pressures of 1, 10, and 100 bars. Determine the gure of meritdescribed in Problem 9.4 for each of these three pressures. Which air pressure will provide the most effective cooling? Hint: See Problem 6.22.
2. The heat transfer rate due to free convection from a vertical surface, 1 m high and 0.6 m wide, to quiescent air that is 20 K colder than the surface is known. What is the ratio of the heat transfer rate for that situation to the rate corresponding to a vertical surface, 0.6 m high and 1 m wide, when the quiescent air is 20 K warmer than the surface? Neglect heat transfer by radiation and any influence of temperature on the relevant thermo- physical properties of air.
The natural water content of a sample taken from a soil deposit was found to be 12%. It has been calculated that the maximum density for the soil will be obtained when the water content reaches 22.0%. Compute how many grams of water must be added to ..
how to calculate the following a hydrogen partial pressure in the humidified fuel gas b oxygen partial pressure in
A body having a mass of 46 kg rests on a horizontal planse for which the coefficiant of friction f = 0.4. A force P acts ofn the body at an angle of 20 degrees with the horizontal. Find its magnitude for impending motion.
sherry wine is a blend of different wines. 200 kg of sherry was being produced by blending 3 different wines. alcohol
two staged steam turbines are arranged as shown in the diagram with a reheater in between the two stages. steam enters
saturated water vapor is enclosed in a piston cylinder arrangement with a volume v initial 5 liters at a temperature
two bars are held together by 6 bolts. bar 1 has a modulus of e a cross-sectional-area of a and a length of l2. it has
A gasoline line is connected to a pressure gage through a double-U manometer, as shown in Fig, if the reading of the pressure gage is 370 kPa determine the gage pressure of the gasoline line.
A solar water heater operating at steady state heats water from 90 0 F to 120 0 F. The panel is 3600 Btu/hr. Determine 1) the mass flow rate of the water in lb/min and 2) the volume of 120 0 F water after 1 hour in gallons.
A throttling valve is used in an air conditioning system to reduce the pressure of refrigerant: R134a as it flows from a condenser to an evaporator. The refrigerant enters the throttling valve at a pressure of 140psia and a temperature of 95F and lea..
4 kgs of saturated liquid water is heated in a steam boiler at 2 mpa to an outlet temperature of 250 c. determine the
a crystalline grain of iron in a steel plate is situated in such a way that a tensile stress of 100 mpa 14.5 ksi is
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