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Aluminium fins of triangular profile are attached to a plane wall whose surface temperature is 250 oC. The fin base thickness is 2 mm, and its length is 6 mm. The system is in ambient air at a temperature of 20 oC, and the surface convection coefficient is 40 W/m2·K. (a) What are the fin efficiency and effectiveness? (b) What is the heat dissipated per unit width by a single fin?
consider a lifting flow over a circular cylinder with a diameter of 0.5m.the freestream velocity is 25 ms and the
A vessel with a frictionless piston contains 1 ft^3 of a gas at 200 psia. The piston is held in position by applying an external force. Calculate the amount of work done if:
a 2 kw resistance heater wire with thermal conductivity k 15 wm-k diameter d .4 cm and length 50 cm is used to boil
1 a pump operates at 3000 psi and delivers 5 gpm. it requires 10 hp to drive the pump. determine the overall efficiency
an aluminum e 9100 ksi control rod with a circular cross section must not stretch more than 0.24 in. when the tension
Verify that heating the wire may be treated as a lumped-capacity process, find the steady-state temperature of the wire and find how long it takes for the temperature of the wire to reach 100°C.
a refrigeration system using r-22 as the working fluid has condenser and evaporator pressures of 250 psi and 30 psi
A cube of material is 4 in. on a side and floats at the interface between kerosene and water, as shown in the figure. Find the specific gravity of the material.
milk is to be transported from texas to california for a distance of 2100 km in a 7-m-long 2-m-external-diameter
the hot water needs of a household are met by a 60 l electric water heater whose heaters are rated at 1.6 kw. the hot
An insulated tank is divided into two parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 60°C and 600 kPa while the other part is evacuated.
a piston-cylinder device contains 1 kg of h2o. the water is at 800oc and a pressure of 20 mpa. heat transfer occurs
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