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- It is planned to lift and move logs from inaccessible forest by means of air balloons. Helium at atmospheric pressure of 101.325 kPaa and temperature of 23.1oC is to be used in the balloons. What minimum balloon diameter will be required for a gross lifting force of 20 metric tons? (Consider k = 1.666 and R =2077.67 J/kg-K for HeliumA 10-cm shaft rides in a 10.03-cm sleeve and 12-cm long, the clearance space (assumed to be uniform) being filled with lubricating oil (? = 0.11 ?? − ?). Calculate the rate at which heat is generated when the shaft turns at 100 rpm in Watts (W). (Rate of energy = Frictional force/resistance x Velocity)Flue gases from an incinerator are released to atmosphere using a stack that is 0.6 m in diameter and 10.0 m high. The outer surface of the stack is at 40°C and the surrounding air is at 10°C. Determine the rate of heat transfer from the stack assuming (a) there is no wind and (b) the stack is exposed to 20 km/h winds.
- A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent? If the average laminar heat transfer coefficient of water is 7740W/m2 degC, what is the overall heat transfer at the laminar section?1. Experimental analysis was carried out about turbulent convective heat transfer in trapezoidal cross-sectioned duct.Average Nusselt numbers and Reynolds numbers were determined for each experiment and the following data set have beenobtained from this investigation. Find an engineering correlation between the average Nusselt number and Reynolds numberin the form ofNu = aRebAn 16-kg slab slides down a 25° inclined plane on a 4-mmthick film of SAE 30 oil at 15.6 °C; the contact area is0.3m2. Find the terminal velocity of the slab. Explain ur answer
- Thrust is required to propel an airplane at a fi nite forwardvelocity. Does this imply an energy loss to the system?Explain the concepts of thrust and drag in terms of the fi rstlaw of thermodynamics.A steam reservoir is covered by a rectangular plate (its length is 1 m and width 2 m). The steam temperature is 95o C, and it is in contact with the plate. Over the outside surface of the plate, water is flowing at a speed of 3 m/sec at a temperature of 25o C. What is the mean Nusselt number over the plate? What is the mean heat transfer convective coefficient over the plate? What is the heat transfer rate to the water?The exact expression for the local Nusselt number for laminar flow along a flat plate is given by: Nux=h(x)x/k=0.332Pr1/3Rex1/2. Atmospheric air at Tinf=400K with a velocity uinf=1.5m/s flows over a flat plate L=2m long maintained at a uniform temperature Tw=300K. Calculate the heat transfer rate from the airstream to the plate from x=0 to x=L=2m for w=0.5m. A. 234 W B. 334 W C. 434 W D. 134 W
- Show that the two-dimensional laminar fl ow pattern withdp/dx =0u = U0(1 - eCy)υ =υ0 < 0is an exact solution to the boundary layer equations .Find the value of the constant C in terms of the fl ow parameters.Are the boundary conditions satisfi ed? What mightthis fl ow represent?Topic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent? If the average laminar heat transfer coefficient of water is 7740W/m2 degC, what is the overall heat transfer at the laminar section?Swamee's equation provides an approximate solution for virtually any usual relative roughness and Reynolds number values. Despite being an approximation that combines the equation for the laminar regime with the Colebrooke-White equation, it presents results that are more applicable than the latter for the critical region (2000 < Re < 4000). Choose an option:( ) Real( ) False