The following statements are about the laminar boundary layer over a flat plate.
ID: 2996358 • Letter: T
Question
The following statements are about the laminar boundary layer over a flat plate. For each statement, answer whether the statement is true or false. Discuss your answer briefly. At a given x-location, if the Reynolds number were to increase, the boundary layer thickness would also increase. As outer flow velocity increases, so does the boundary layer thickness. As the fluid viscosity increases, so does the boundary layer thickness. As the fluid density increases, so does the boundary layer thickness. The boundary layer equations are approximations of the Navier-Stokes equation. The curve representing boundary layer thickness as function of x is a streamline. The boundary layer approximation bridges the gap between the Euler equation and the Navier-Stokes equation.Explanation / Answer
a) False , boundary layer decreses during turbulent motion.The effect of viscosity is confined to small region of boundary layer with increse of Reynolds number.
b) False, Reynold number is directly proportional to velocity of outflow. So explanation of question a) holds good
c) True, because boundary layer definition depends on viscosity. More viscous fluid more boundary layer thickness
d)False,density is proportional to Reynolds number
e)True, N.S equation is the basis for any fluids problem
f) True, Curve defines the viscosity effected region, which also implies streamline
g)False