CHE218_solutions9

CHE218_solutions9 - Problem 6.81 - rework Example 6.19 for...

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Problem 6.81 - rework Example 6.19 for particle settling in water at 68F . cP 10 2 poise := D p 10 6 m := ρ p 2000 kg m 3 := ρ f 1000 kg m 3 := μ f 1.002cP := Assuming that stokes law applies, velocity may be directly calculated [Equation 6.57 p 223]. Then the Reynolds number needs to be calculated and the assumption must be verified. V D p 2 g ρ p ρ f ( ) 18 μ f := V 5.437 10 7 × m s = V 1.784 10 6 × ft s = R e D p V ρ f μ f := R e 5.426 10 7 × = Which is well in the linear region (off chart) on Figure 6.24, thus assumption of Stokes Law was justified. Problem 6.82 - rework Example 6.20 for ball falling in glycerin instead of in water. μ glyc 800cP := ρ glyc 78.5 lb ft 3 := ρ glyc 1.257 10 3 × kg m 3 = D s 0.02m := SG 7.85 := ρ s SG 1000 kg m 3 := Assuming that stokes law applies, velocity may be directly calculated [Equation 6.57 p 223]. Then the Reynolds number needs to be calculated and the assumption must be verified.
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This homework help was uploaded on 04/18/2008 for the course CHE 218 taught by Professor Smith during the Spring '08 term at SDSMT.

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CHE218_solutions9 - Problem 6.81 - rework Example 6.19 for...

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