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Consider a large vertical plate with a uniform surface temperature of 130°C suspended in quiescent air at 25°C and atmospheric pressure.
(a) Estimate the boundary layer thickness at a location 0.25 m measured from the lower edge.
(b) What is the maximum velocity in the boundary layer at this location and at what position in the boundary layer does the maximum occur?
(c) Using the similarity solution result, Equation 9.19, determine the heat transfer coefficient 0.25 m from the lower edge.
(d) At what location on the plate measured from the lower edge will the boundary layer become turbulent?
a steady-flow diffuser has a 1 cm-diameter inlet and a 1.5 cm-diameter outlet. air enters this diffuser at 6 mpa 300 oc
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Consider an air-standard Otto cycle starting at 9 psia, 77 deg F, with a compression ratio of 11, and a specific heat addition of 200 Btu/lbm. Assume 80% adiabatic compression efficiency and a 75% adiabatic expansion efficiency. Calculate the overall..
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Steam enters a diffuser at 20 psia and 240oF with a velocity of 900 ft/s and exits as saturated vapor at 240oF and 100 ft/s. The exit area of the diffuser is 1 ft2. Determine (a) the mass flow rate of steam and (b) the rate of entropy generation.
Discuss why the torque characteristics of a bifilar-wound motor are better than those of a unifi lar-wound motor at high stepping rates.
a liquid-vapor phase change process in microgravity conditions is carried out sufficiently slowly so that a one
For the position shown in the figure, determine the orientation of the neutral axis and calculate the maximum tensile stress σt and maximum compressive stress σc in the beam. Assume that θ= 30° and M = 30 k-in.
Consider the influence of thermocouple spacing, dimensions of the bars, heat-flux measurement, and temperature measurement on accuracy. Take the thermal conductivity of the known material as exactly 20 Btu/h · ft · ?F.
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