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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.
consider a small simple rankine power cycle which produces 600kw power from an electric generator with an efficiency of
Consider this multi-fluid container that contains fluids of different SGs as shown except for one fluid. Given that the pressure measured by the gage is 15.5 psia and the pressure in the container is 108.55 kPa, calculate the specific gravity of the ..
the edges of a thin plate are held at the temperature described below. determine the steady-state temperature
The engine of the van produces a constant driving traction force F at the wheels as it ascends the slope at a constant velocity v, determine the magnitude of the acceleration of the van,in m/s^2 .when it passes point A and begins to travel on a level..
What is the change in enthalpy (in kJ/kg) of oxygen as its temperature changes from 29°C to 181°C? Assume an ideal gas with R = 0.2598 kJ/kg-K and a ratio of specific heats of 1.4.
Superheated steam at 600 C and 4000 kPa is fed into a turbo expander at a rate of 10 kg/s. The steam expands and leaves the expander at 500 kPa pressure and 300 C. It is known that there is a heat loss of 50 kJ/sec. This heat loss can be assumed to t..
a simple rankine cycle with water as the operating fluid operates with a boiler pressure of 6000kpa and a condenser
Calculate the delta velocity required to change the inclination of a circular orbit at 32,000 km altitude from a 28.5 degree inclination to an inclination of 45 degrees. Compute the propellant used if the satellite weighs 1200 lbs after the manoeuvre..
The project engineer, the shop foreman, and a consultant met to discuss the problem. The consultant proposed applying forward and back tension during rolling, the project engineer suggested reducing the reduction per pass, and the shop foreman fav..
suppose that coal costs 45ton at the power plant fuel oil costs 60bbl 1 bbl has appoximately 6?106 btu 6 mmbtu and
a bar of mild steel has a diameter of 75 mm and is placed inside a hollow aluminum cylinder of internal diameter 75 mm
A well-insulated heat exchanger is used to heat water (cp = 4.18 KJ/kg*K) from 300 K to 90°C with a mass flow rate of 3 kg/s. Heat is supplied by hot oil (cp = 2.3 KJ/kg*K) that enters the heat exchanger at 200°C with a mass flow rate of 15 kg/s.
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