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1. Calculate the critical heat flux on a large horizontal sur- face for the following fluids at 1 atm: mercury, ethanol, and refrigerant R-134a. Compare these results to the critical heat flux for water at 1 atm.
2. Water at atmospheric pressure boils on the surface of a large horizontal copper tube. The heat flux is 90% of the critical value. The tube surface is initially scored; however, over time the effects of scoring diminish and the boiling eventually exhibits behavior similar to that associated with a polished surface. Determine the tube surface temperature immediately after installation and after prolonged service.
3. The bottom of a copper pan, 150 mm in diameter, is maintained at 115°C by the heating element of an elec- tric range. Estimate the power required to boil the water in this pan. Determine the evaporation rate. What is the ratio of the surface heat flux to the critical heat flux? What pan temperature is required to achieve the critical heat flux?
steam enters an adiabatic turbine at 8 mpa and 520 degc with a volumetric flow rate of 0.8 m3s and exits at 30 kpa. the
Estimate the slope dp/dt of the ice +water line using the triple point information. Specific entropy of ice at the triple point is -1221J/kgK , specific entropy of liquid water at triple point is 0.0 J/kgK. Determine therefore the temperature in Cels..
water is the working fluid in a cogeneration cycle that generates electricity and provides heat for campus buildings.
A 0.7-lb block rests on top of a 0.5-lb block supported by but not attached to a spring of constant 9 lb/ft. The upper block is suddenly removed. Determine (a) the Maximum velocity reached by the 0.5-lb block, (b) the maximum height reached by the..
prepare a journal papernbsp the journal paper inhibits -nbsp abstract-nbsp introductionnbsp literature reviewsnbsp
air from a line at 12 mpa 15 deg c flows into a 500-liter rigid tank that initially contains air at 100 kpa and 15 deg
a long 10 cm square copper bar is bounded by 260c gas flows on two opposing sides. these flows impose heat transfer
the loop transfer function of a single-loop negative feedback system isls gcsgs ks 2.5.5 3.2 s2s 1s 10s 30this
The net power output of the overall power system.
helium at 810 r 45 ibfin2 and a velovity of 10 fts enters an insulated nozzle operating at steady state and exits at
a high strength steel drill rod used for boring a hole in the earth has a diameter of 0.5 in. the allowable shear
a rocket of initial mass m0 including shell and fuel is red vertically at time t 0. the fuel is consumed at a constant
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