Dave Dickey Forum Moderator 303 Posts
Re: How do you determine the liquid force on the baffle?7 April 2010 at 1:29pm
Most of your dimensions and conditions will have little effect on the baffle load. The baffle should be designed to handle the maximum torque that can be delivered by the motor (2 hp) at the operating speed (420 rpm). The torque calculation can be done as 63025 * (2 hp) / (420 rpm) = 300 in-lbs = 34 N.m. With the baffle located 600 mm (0.6 m) from the centerline, it must be able to handle the full motor torque or 57 Newtons force.
Worst case for the baffle is if all of that force is applied at the end of the baffle. Realistic case is if that force is distributed over the submerged length of the baffle.
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I have a tank of 1.6 m diameter and 3.5 m height containing liquid of 1.1 density. I need to install an agitator with one impeller of 300 mm diameter, 3 m shaft length, and with one baffle at 600 mm from the tank center. The agitator's speed is 420 rpm, motor power 2HP. I would like to determine the liquid force on the baffle.
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