Flow of Fluids Theory

Question 1 of 36

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are substances that do not permanently resist distortion and, hence, will change their shape.

Question 2 of 36

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fluids are those that are inappreciably affected by changes in pressure, e.g. most liquids.

Question 3 of 36

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fluids are those that are appreciably affected by changes in pressure, e.g. most gases.

Question 4 of 36

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is the branch of momentum transfer concerned with fluids at rest.

Question 5 of 36

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is the branch of momentum transfer concerned with fluids in motion.

Question 6 of 36

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roughly states that there is a linear relation between shear stress and rate of shear, and that the proportionality constant is the viscosity.

Question 7 of 36

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is the ratio of viscosity to density.

Question 8 of 36

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fluids are those that obey Newton’s Law of Viscosity, i.e. have constant viscosities.

Question 9 of 36

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fluids are those having viscosities as a function of shear rate.

Question 10 of 36

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Gases and low molecular weight liquids are generally fluids.

Question 11 of 36

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flow is the type of flow at low velocities where the layers of fluid seem to slide by one another without eddies or swirls being present.

Question 12 of 36

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flow is the type of flow at higher velocities where eddies are present giving the fluid a fluctuating nature.

Question 13 of 36

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The is the ratio of the kinetic or inertial forces and viscous forces.

Question 14 of 36

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For a straight circular pipe, values less than indicates laminar flow, and above indicates turbulent flow.

Question 15 of 36

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Frictional losses in the entrance region are than those of the same length of fully developed flow.

Question 16 of 36

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number is the ratio of the fluid velocity to the speed of sound or acoustic velocity.

Question 17 of 36

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For Mach number greater than 1, flow is . If equal to 1, flow is and the velocity equals the local speed of sound. If less than 1, flow is .

Question 18 of 36

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The ratio of heat capacities for air is typically .

Question 19 of 36

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meters are often used to measure flows in large lines, such as city water systems. For ordinary industrial installations, they are relatively expensive and takes considerable amount of space. The meter overcomes the disadvantages of this meter but in exchange for a much larger head or power loss.

Question 20 of 36

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For incompressible fluids, the compressibility factor, Y is essentially equal to .

Question 21 of 36

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Generally, the word “” designates a machine or device for moving an incompressible fluid.

Question 22 of 36

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These are devices for moving gas (usually air).

Select one or more of the following:

  • Fans

  • Blowers

  • Compressors

  • Pumps

Question 23 of 36

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discharge large volumes of gas at low pressures of the order several hundred mm of water.

Question 24 of 36

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and discharge gases at higher pressures.

Question 25 of 36

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In pumps and fans, the pressure of the fluid does not change appreciably, and flow can be assumed.

Question 26 of 36

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If the pressure on the liquid in the suction line drops to the vapor pressure, some of the liquid flashes into vapor. This is called .

Question 27 of 36

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The and pumps can be used to very high pressures, whereas pumps are limited in their head and are used for low pressures.

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    reciprocating
    reciprocating
    rotary
    rotary
    centrifugal
    centrifugal

Question 28 of 36

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In general, in chemical and biological processing plants, pumps are primarily used.

Question 29 of 36

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The most common method of moving small volumes of gas at low pressures is by means of .

Question 30 of 36

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theory can be used to calculate the power of fans.

Question 31 of 36

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Non-Newtonian fluids can be divided into two broad categories on the basis of their shear stress/shear rate behavior:
• Shear stress is independent on time or duration of shear ()
• Shear stress is dependent on time or duration of shear ()

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    time-independent
    time-independent
    time-dependent
    time-dependent

Question 32 of 36

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These are the simplest because they differ from Newtonian fluids only in that their linear relationship does not go through the origin.
Examples: peat slurries, margarine, chocolate mixtures, grease, soap, grain-water suspensions, toothpaste, paper pulp, and sewage sludge

Select one of the following:

  • Bingham Plastic Fluids

  • Pseudoplastic or Shear-thinning Fluids

  • Dilatant or Shear-thickening Fluids

  • Thixotropic Fluids

  • Rheopectic Fluids

Question 33 of 36

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The majority of non-Newtonian fluids are in this category.
The apparent viscosity decreases with increasing shear rate.
Examples: polymer solutions, greases, starch suspensions, mayonnaise, biological fluids, detergent slurries, and paints.

Select one of the following:

  • Bingham Plastic Fluids

  • Pseudoplastic or Shear-thinning Fluids

  • Dilatant or Shear-thickening Fluids

  • Thixotropic Fluids

  • Rheopectic Fluids

Question 34 of 36

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These fluids are far less common than pseudoplastics.
The apparent viscosity increases with increasing shear rate.
Examples: corn flour-sugar solutions, wet beach sand, starch in water, potassium silicate in water, and some solutions containing high concentrations of powder in water.

Select one of the following:

  • Bingham Plastic Fluids

  • Pseudoplastic or Shear-thinning Fluids

  • Dilatant or Shear-thickening Fluids

  • Thixotropic Fluids

  • Rheopectic Fluids

Question 35 of 36

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These fluids exhibit a reversible decrease in shear stress with time at a constant rate of shear.

Select one of the following:

  • Bingham Plastic Fluids

  • Pseudoplastic or Shear-thinning Fluids

  • Dilatant or Shear-thickening Fluids

  • Thixotropic Fluids

  • Rheopectic Fluids

Question 36 of 36

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These fluids exhibit a reversible increase in shear stress with time at a constant rate of shear.

Select one of the following:

  • Bingham Plastic Fluids

  • Pseudoplastic or Shear-thinning Fluids

  • Dilatant or Shear-thickening Fluids

  • Thixotropic Fluids

  • Rheopectic Fluids

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Flow of Fluids Theory

Dodong Aleta
Quiz by , created about 1 year ago

Flow of Fluids Summary

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Dodong Aleta
Created by Dodong Aleta about 1 year ago
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