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1.Water flows at 50oC inside a 2.5-cm-inside-diameter tube such that hi= 3500 W/m2 oC. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m2 oC. The outside of the tube loses heat by free convection with ho = 7.6 W/m2 oC. Calculate the overall heat-transfer coefficient and heat loss per unit length to surrounding air at 20oC.
2. Two 3.0-cm-diameter 304 stainless-still bars, 10 cm long, have ground surfaces and are exposed to air with a surface roughness of about 1 ?m. If the surfaces are pressed together with a pressure of 50 atm and the two-bar combination is exposed to overall temperature difference of 100oC, calculate the axial heat flow and temperature drop across the contact surface.
a compressor pressurizes air from 1 atm to 2.38 atm at steady state. at the entry the airs temperature is 70f whereas
discuss whether the following situations should be modeled as closed systems or open systems. clearly define the
a jet engine propels an aircraft at 300 ms through air at 60 kpa and 0 c. the inlet diameter of this engine is 2 m the
2 kg of water at 10oc and atmospheric pressure are placed in a pressure cooker and heated until the water boils at
Determine the smallest gauge of copper wire which must be used if the indicated maximum temperature is to be less than 202°C - Explain what is meant by 'the law of intermediate metals' relating to temperature measurement using thermocouples.
a brayton cycle with regeneration using air as the working fluid has a pressure ratio of 7. the minimum and maximum
consider a large furnace that can supply energy in the form of heat at 2000 r at a steady rate of 3000 btus. determine
communication satellites are placed in a geosynchronous orbitthat is in a circular orbit such that they complete one
a condenser condenses saturated water vapor at 100 kpa to a saturated liquid. the steam enters at 3 ms and exits at 100
an old-style wooden irrigation gate is opened by pulling on a steel cable that connects to the bottom of the gate. how
the entire assembly is placed in an environment whose temperature is 200c. determine the volume of chamber 1 when thermodynamic equillibrium has been estabilished.
the revolving joint type v of an industrial robot has a range of 240? rotation. the mechanical errors in the joint and
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