## How does particle size affect viscosity?

Decreasing particle size increases viscosity. The impact of increasing the number of particles present is magnified by these layers. This, in turn, increases the suspension viscosity by increasing the effective volume fraction for a specific particle loading.

## How does particle size affect flow rate?

With the rise of particle size, powder changes from cohesive state to more free flowing. Therefore, discharge rate increases but SE decreases with the particle, and a negative correlation between discharge rate and BFE was obtained.

## How does particle size affect filtration?

As particles deposit in a filter, pressure drop (headloss) across the filter increases. Particle removal and filter headloss characteristics vary with the size of particles in the filter influent. A hypothesis that the filter headloss is proportional to the volume of the deposit was also tested.

## How does particle size affect sedimentation?

Larger particles (with identical specific mass) sediment faster than smaller particles. When particles are typically smaller than about a = 10 − 100nm, sedimentation velocities in the earth’s gravitational field are very small, and sedimentation experiments must be performed by centrifugation.

## Why do large particles settle faster?

Sedimentation: The settling rate of a mineral particle in water, sedimentation, depends on the size of the particle. Large particles settle out of suspension more rapidly than small particles. The density of water and its viscosity both change in a manner so that particles settle faster with increased temperature.

## What is the relationship between particle size and the time it takes for particles to settle?

1) Size – The smaller the particle (clay, silt) the slower it will settle out. Larger sediments (cobbles, boulders) will settle quickly. As the stream slows down, the larger particles settle first… 2) Shape – Rounder, more spherical particles settle out faster than flat, angular or irregularly shaped particles.

## Which particle size settles first?

When a mixture of particle sizes is suspended in a column of water, the heavy large particles settle first. When a soil sample is stirred or shaken, sand particles will settle to the bottom of the cylinder after 2 minutes, while the clay and silt size particles will stay in suspension.

## Is there a relationship between the mass of an object and the rate of settling?

The settling rate of a particle depends on its size, shape, and density as well as on the vis- cosity of the fluid through which it is settling. In general, smaller particles have a larger sur- face area to mass ratio, so their settling rates are slowed more by frictional drag than are larger grains.

## What are the factors on which settling of particles depend?

In addition to particle size, density and concentration, and fluid viscosity, other less obvious factors affect the sedimentation rate. These include particle shape and orientation, convection currents in the surrounding fluid, and chemical pretreatment of the feed suspension.

## What is type1 settling?

Type 1 – Dilutes, non-flocculent, free-settling (every particle settles independently.) Type 2 – Dilute, flocculent (particles can flocculate as they settle). Type 3 – Concentrated suspensions, zone settling, hindered settling (sludge thickening). Type 4 – Concentrated suspensions, compression (sludge thickening).

## In which type of settling sedimentation of discrete particles takes place?

In which type of settling, sedimentation of discrete particles takes place? Explanation: In Discrete settling, sedimentation of discrete particles takes place where the particles have little tendency to flocculate. 3.

## What is the size of the coarse screen used in pretreatment of water?

What is the size of the coarse screen used in pretreatment of water? Explanation: Coarse screens are used in the form of bars of 25mm diameter size and are spaced at 75 to 100mm centers.

6 to 150 mm

## Which of the following statement is wrong regarding filtration?

1. Which of the following statement is wrong regarding filtration? Explanation: Filtration is a primary turbidity removal process. Explanation: In Mechanical Straining, particles coarser than the void size is arrested.

fire demand

## What are the main factors depends upon amount of water demand?

Factors Affecting the Rate of Demand of Water | Water Engineering

• Factor # 2. Cost of Water:
• Factor # 3. Pressure in the Distribution System:
• Factor # 4. Economic Status of Consumers:
• Factor # 5. Number of Commercial Establishments and Industries:
• Factor # 6. Method of Charging—Metered or Unmetered Water Supply System (or Policy of Metering):
• Factor # 8. Sewerage System:
• Factor # 9.

## What method is used to measure the color of water?

Tintometer method

## What is the peak hourly demand in water supply?

Peak Hourly Demand (PHD) – The maximum volume of water delivered to the system in a single hour expressed in gallons per day. Distribution systems should be designed to adequately handle the peak hourly demand or maximum day demand plus fire flows, whichever is greater.

## What are the fluctuations in water demand?

Fluctuations in demand of water: water demand is maximum. This demand is reducing and in winter it becomes minimum because less water will be used in bathing and no lawn watering. These fluctuations may be up to 150 % of the average annual consumption. conditions, holidays etc.

## What is Peak factor in water supply?

ABSTRACT. The availability of stochastic peaking factors allows water supply systems to be analysed much more thoroughly than when only a single value peaking factor is used. A particular application of stochastic peaking factors is for the sizing of water supply distribution pipes.

## What is the main disadvantage of hard water?

Explanation: Hard water consumes more amount of soap. Hard water requires more scaling in boilers. Hard water also corrodes and incrusts pipes.২১ সেপ্টেম্বর, ২০২০

## Why Hard water is not suitable for its use?

Answer: Hard water contains dissolved salts of calcium and magnesium. It gives poor lather with soap and hence is not intended to be used in laundries and in water boilers used in industries. Hard water is also responsible for the clogging of pipe lines.১২ জুন, ২০১৯

## Which units are used to express hardness in water?

Hardness is most commonly expressed as milligrams of calcium carbonate equivalent per litre. Water containing calcium carbonate at concentrations below 60 mg/l is generally considered as soft; 60–120 mg/l, moderately hard; 120–180 mg/l, hard; and more than 180 mg/l, very hard (McGowan, 2000).