Grit chamber is used to remove inorganic-inert materials fromwater. Here, inorganic particles such as sand settle and sludgeobtained at the bottom is swiped.tats, and greaseIn order to have these particles settle down, laminar flowconditions have to be satisfied. Otherwise, efficient settlingcannot be reached.Settling velocity under laminar conditions can be calculated bythe following equation:In this equation, g: gravitational force:specific weight of particled:diameter of the particle:viscosity of the fluidIf the hydraulic radius of the tank is 1.2m, viscosity of water at20°C is 1.3x10 m/s, specific weight of the particle is 2.65 g/cm³,and particle diameter is 0.1 mm;a) Determine the maximum velocity required to have laminarflow.b) Calculate the settling velocity of particles.

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Answered: a) Determine the maximum velocity…

Engineering

Civil Engineering

a) Determine the maximum velocity required to have laminar flow. b) Calculate the settling velocity of particles.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Grit chamber is used to remove inorganic-inert materials from
water. Here, inorganic particles such as sand settle and sludge
obtained at the bottom is swiped.
tats, and grease
In order to have these particles settle down, laminar flow
conditions have to be satisfied. Otherwise, efficient settling
cannot be reached.
Settling velocity under laminar conditions can be calculated by
the following equation:
In this equation, g: gravitational force
:specific weight of particle
d:diameter of the particle
:viscosity of the fluid
If the hydraulic radius of the tank is 1.2m, viscosity of water at
20°C is 1.3x10 m/s, specific weight of the particle is 2.65 g/cm³,
and particle diameter is 0.1 mm;
a) Determine the maximum velocity required to have laminar
flow.
b) Calculate the settling velocity of particles.

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