What are the turbulence intensity differences on offshore and onshore?
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What are the turbulence intensity differences on offshore and onshore?
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- What are the three layers within turbulent flow? In which layer is the velocity smallest and in which layer is the turbulent portion of the shear stress dominant?What fluid property is responsible for the development of the velocity boundary layer? What is the effect of the velocity on the thickness of the boundary layer?Write down the power-law velocity profile empirical correlation and when is this relation valid?
- (b) In turbulent flows contrast the approaches that are used to represent the velocity profile within the boundary layer and comment on any limitations that each may offer.What is the physical significant of prandtl number? Question does the value of the prandtl number depend on the type of flow, or the flow geometry? Does the prandtl number of air change with pressure? does it change your temperature?How does the viscosity affect the drag force?
- 5 Air at 90°C and 1 atm flows over a flat plate at a velocity of 30 m/s. How thick is the boundary layer at a distance of 2.5 cm from the leading edge of the plate? ir AowsAir with free stream temperature of 10 C is flowing over a flat plate (1.5m long and Im wide). The air is flowing along 1.5m side of the plate. The plate is maintained at 90 C. Find the velocity of air required to have a rate of heat dissipation as 3.75 kW. Use the correlations: Nu =0.664Res Pro3 for laminar flow Nu, = (0.037R *-871)Pr for turbulent flow Take the properties p = 1.0877 kg/m u=2.029x10 m/s, k=0.028 W/mK, C,-1.007KJ/kg.K and Pr=0.703 %3DWhich parameter does not affect an earlier occurrence of the transition of Laminar flow to turbulent flow in the boundary layer of the flat plate?
- What is flow separation? What causes it? What is the effect of flow separation on the drag coefficient?Which of the following statement is wnong? O a. In the boundary layer region the frictional effect is negligible O b. The heat transfer in liguid and gases takes place according to conwection Oc The amount of heat flow througha body is dependert upon the material of the body O d. The logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference2. Use scale analysis to find an expression for 8/L and Nu, for flow over a flat plate with a thin thermal boundary Layer. (8 >> ST)