Finding the expanded depth of the uniform medium Filter medium sand grains (0.4mm in diameter) Ψ= 0.85 specific gravity= 2.65 depth of the bed=0.67m porosity=0.4 T=20 C μ= 1.002 .10-3N.s / m2 ρw=998 .2 kg / m3 Determine the required backwash velocity to expand the bed to a porosity of 0.7.

Finding the expanded depth of the uniform medium Filter medium sand grains (0.4mm in diameter) Ψ= 0.85 specific gravity= 2.65 depth of the bed=0.67m porosity=0.4 T=20 C μ= 1.002 .10-3N.s / m2 ρw=998 .2 kg / m3 Determine the required backwash velocity to expand the bed to a porosity of 0.7.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.12P

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Question

Finding the expanded depth of the uniform medium
Filter medium sand grains (0.4mm in diameter)
Ψ= 0.85
specific gravity= 2.65
depth of the bed=0.67m
porosity=0.4
T=20 C
μ= 1.002 .10^-3N.s / m²
ρ_w=998 .2 kg / m³
Determine the required backwash velocity to expand the bed to a porosity of 0.7.

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