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1. A polished copper sphere of 10-mm diameter, initially at a prescribed elevated temperature Ti, is quenched in a saturated (1 atm) water bath. Using the lumped capaci- tance method of Section 5.3.3, estimate the time for the sphere to cool (a) from Ti = 130°C to 110°C and (b) from Ti = 550°C to 220°C. Make use of the average sphere temperatures in evaluating properties. Plot the temperature history for each quenching process.
2. A tube of 2-mm diameter is used to heat saturated water at 1 atm, which is in cross flow over the tube. Calculate and plot the critical heat flux as a function of water velocity over the range 0 to 2 m/s. On your plot, identify the pool boiling region and the transition region between the low- and high-velocity ranges. Hint: Problem 10.20 contains relevant information for pool boiling on small-diameter cylinders.
an air-hockey puck has a mass of 0.01 kg and a diameter of 90 mm. when it is placed on the air table an air film of
a well-insulated turbine operating at steady state has two stages in series. steam enters the first stage at 800
5ft3 of ammonia is initially at 100 psi and a specific volume of 0.024ft3lbm is heated or cooled to make this an
A long electric wire of radius r0 generates heat at rate of q'''. The surface is maintained at uniform temp of T0. Write heat equation and boundary conditions for steady state one dimensional conduction.
An ideal gas (MW = 26.0 lbm/lb·mol) undergoes a poly tropic process (with poly tropic index being 1.67) from an initial state of 6.9836 ft3/lbm and 60°F to a final volume of 0.86848 ft3/lbm. Show the process on a P-v diagram. Find the specific work o..
Why is it often difficult to evaluate the elastic limit. What is the effect of poor alignment of the specimen. Why does a specimen that is properly aligned provide a more accurate estimate of the tensile strength compared to the estimate provided f..
find the complete initial and final states for the following processes t p v h u s and phase involving simple
The open tank contains water at 20C. For incompressible flow, derive an analytic expression for dl/dt in terms of (Q1, Q2,Q3)
two kg of nitrogen at 40degc and 200 kpa are contained in a frictionless piston-cylinder device. the nitrogen is
a cold air-standard otto cycle operates between temperature limits of 70 and 1500 f. calculate the thermal efficiency
A 8 m rectangular gate shown below weighing 200 N is held in place by a horizontal flexible cable as shown in the figure below. Water acts against the gate which is hinged (frictionless hinge) at point A. determine the tension in the cable.
A specimen of aluminium having a rectangular cross section 9.9 mm × 13.0 mm (0.3898 in. × 0.5118 in.) is pulled in tension with 35300 N (7936 lbf) force, producing only elastic deformation. The elastic modulus for aluminium is 69 GPa (or 10 × 10 6..
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