Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dp, with porosity 'ε' is________________?
Correct answer: A. (Dp/6) (ε/1- ε)
- A. (Dp/6) (ε/1- ε)
- B. (Dp/6) (1- ε/ε)
- C. ⅔Dp (1- ε/ε)
- D. ⅔Dp (ε/1- ε)
Explanation
Hydraulic mean radius equals void volume divided by wetted solid surface area. For spherical particles, the solid surface per bed volume is 6(1-epsilon)/Dp, giving Rh = (Dp/6)[epsilon/(1-epsilon)].
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