A wastewater bar screen is constructed using 6.5-mm wide bars spaced $.0-cm. apart centre to centre. The wastewater flow velocity in the channel immediately upstream of the se from 0.4 to 0.9 m/s. Assume that the discharge 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?

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

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