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Example 6.6 For the problem in Example 6.5, determine if the power dissipated conforms to the requirement of effective mixing. Assume that mixing occurred in a volume of a rectangular parallelepiped of length equal to the length of the weir, width equal to 0.2 of the length of the weir, and depth equal to 0.5 of HD.

Solution: To determine if the power dissipated conforms to the criterion of effective mixing, the G value would be calculated and compared with the values of Table 6.2.

G = /— ¡1 = 8.8( 10 )kg/m-s (assuming temperature = 25°C) WV

From Table 6.2, at to = 3.33 sec, G should range from 1,500 per sec to 4,000 per sec. 2,994.87 per sec is within this range and the design conforms to the criteria for effective mixing. Ans

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