The statement that is not true about the concept of a boundary layer on an object is: a. the reynolds number is greater than unity. b. viscous effects are present only inside the boundary layer. c. the fluid velocity is zero at the surface of the object. d. the fluid velocity equals the free stream velocity at the edge of the boundary layer. e. the velocity gradients normal to the flow direction are small.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

The higher the astm grain size number, the finer the gran is. a)-true b)-false