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1. Liquid mercury at 0.5 kg/s is to be heated from 300 to 400 K by passing it through a 50-mm-diameter tube whose surface is maintained at 450 K. Calculate the required tube length by using an appropriate liquid metal convection heat transfer correlation. Compare your result with that which would have been obtained by using a correlation appropriate for Pr 0.7.
2. The surface of a 50-mm-diameter, thin-walled tube is maintained at 100°C. In one case air is in cross flow over the tube with a temperature of 25°C and a velocity of 30 m/s. In another case air is in fully developed flow through the tube with a temperature of 25°C and a mean velocity of 30 m/s. Compare the heat flux from the tube to the air for the two cases.
an ideal gas power cycle is executed within a closed piston-cylinder system and consists of three processes as follows1
Steam at 10bar and 0.95 dry flows at 130 m/sec in a pipe. It is throttled to 8 bar and the flow rate is 12 kg/sec. Assuming velocity in the pipe on the down stream side of the valve is 160 m/sec. Find the final condition of steam and the pipe diam..
carbon dioxide oxygen and nitrogen enter a reactor operating at steady state with equal molar flow rates. and
A vertical piston/cylinder device contains 0.01 lbm of gas. The initial gas volume is 0.18 ft3 and the initial specific internal energy is 282 Btu/lbm. The piston, with a mass of 110 lbm and cross-sectional area of 0.11 ft2, is in equilibrium with th..
water is syphoned from the container to a lower place. the flexible hose has a constant diameter and the location
A 90 percent-efficient turbine accepts water at 400 kPa in a 16-cm-diameter pipe. What is the maximum power output if the flow rate is (a) 0.08 m3=s, (b) 0.06 m3=s, and (c) 0.04 m3=s? The water is emitted to the atmosphere.
in a close stationary system 2 kg of argon is heated from 20oc to 120oc. determine the amount of heat transfer when
water at 200 lbfin2 and 300 f is throttled adiabatically through a valve to 30 lbfin2. the inlet velocity is 5 fts and
draw the shear and bending moment diagrams for the beam and loading shown and determine the maximum normal stress due
A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. How much ener..
Water flows out through a set of thin, closely spaced blades as shown in Fig. P5.4 with a speed of V = 10 ft/s around the entire circumference of the outlet. Determine the mass flow rate through the inlet pipe.
A system contains a substance that is initially at 100 °C and 1 MPa and it later at 0 °C and 100 kPa. Determine the change in specific enthalpy for the process if the unknown substance is: a) liquid kerosene, b) helium gas (He), c) solid aluminium (A..
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