The wastewater flow velocity in the channel immediately upstream of the screen will vary from 0.4 to 0.9 m s−1. What is the design headloss for the screens at the two extremes of flow? Assume that the friction coefficient is 0.84. A) What are the design head losses for the screens at the two extremes of flow (0.4 and 0.9 m/s) if the screen is mechanically-cleaned? B) What are the design head losses for the screens at the two extremes of flow (0.4 and 0.9 m/s) if the screen is manually-cleaned?

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?