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DF 34 - 35 Rheology

Mer Scott 12 questions

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  1. 1We can classify flow properties of materials as Newtonian, meaning flow properties [blank_start]obey[blank_end] Newton’s law of flow, or non-Newtonian (flow properties [blank_start]do not obey[blank_end] Newton’s law of flow). Emulsions, suspensions, creams, ointments, gels have [blank_start]non-Newtonian[blank_end] flow properties. New's law of flow is that shear [blank_start]stress[blank_end] is proportional to shear [blank_start]rate of flow[blank_end], ie the more [blank_start]force[blank_end] that is applied the [blank_start]faster[blank_end] a fluid flows.
    1. Aobey
    2. Bdo not obey
    3. Cnon-Newtonian
    4. DNewtonian
    5. Estress
    6. Frate of flow
    7. Gforce
    8. Hfaster
  2. 2A flow curve/rheogram plots [blank_start]shear rate over shear stress[blank_end],
    A viscogram plots [blank_start]viscosity over shear stress[blank_end], or sometimes shear rate.
    1. Ashear rate over shear stress
    2. Bviscosity over shear stress
  3. 3For non-Newtonian materials viscosity is independent of shear stress, and can be represented by a single value known as "absolute viscosity".
    1. ATrue
    2. BFalse
  4. 4A Newtonian fluid will have low viscosity.
    1. ATrue
    2. BFalse
  5. 5For Newtonian materials, viscosity depends on the [blank_start]magnitude[blank_end] of applied [blank_start]shear stress[blank_end]. Viscosity cannot be represented by a single ([blank_start]absolute[blank_end]) value and is expressed as an “[blank_start]apparent[blank_end] viscosity” at a particular rate of shear.
    1. Amagnitude
    2. Bshear stress
    3. Capparent
    4. Dabsolute
  6. 6Classification of Non-Newtonian materials
    1. Plastic:
    Materials that [blank_start]do not flow[blank_end] at low shear stresses, but flow [blank_start]like Newtonian-liquids[blank_end] above their yield value.
    2. Pseudoplastic flow:
    Materials whose [blank_start]viscosity decreases[blank_end] with an increasing rate of shear stress
    3. Dilatant flow:
    Materials whose [blank_start]viscosity increases[blank_end] with an increasing rate of shear stress.
    4. Thixotropic flow:
    Materials whose [blank_start]viscosity depends on[blank_end] the [blank_start]duration and the rate[blank_end] of shear stress.
    1. Ado not flow
    2. Blike Newtonian-liquids
    3. Cviscosity decreases
    4. Dviscosity increases
    5. Eviscosity depends on
    6. Fduration and the rate
  7. 7Plastic flow is caused by [blank_start]concentrated[blank_end] suspensions associated with the presence of [blank_start]flocculated[blank_end] particles; [blank_start]floccules[blank_end] at rest have a high frictional
    force holding them [blank_start]together[blank_end] that can be overcome by shear stress (at the [blank_start]yield value[blank_end]). Individual particles mean there is [blank_start]no frictional force[blank_end].
    1. Aconcentrated
    2. Bflocculated
    3. Cfloccules
    4. Dtogether
    5. Eyield value
    6. Fno frictional force
  8. 8Pseudoplastic materials exhibit shear thickening and dilatant materials exhibit shear thinning.
    1. ATrue
    2. BFalse
  9. 9Pseudoplastic properties are typically displayed by natural and synthetic polymers in solution. Which of these would not cause pseudplastic flow?
    1. ATragacanth
    2. BMethycellulose
    3. CAlginates
    4. DSodium lauryl sulfate
  10. 10Pseudoplastic flow is caused by:
    1. AHigh frictional forces being lowered as particles deflocculate.
    2. BHigh viscosity globular polymer chains aligning in the direction of applied shear stress which reduces internal resistance to flow.
    3. CVolume increasing as shear is applied due to high fraction of dispersed solids.

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Description
PHCY211 (Formulation) Quiz on DF 34 - 35 Rheology, created by Mer Scott on 06/05/2018.
Author
Mer Scott
Language
English
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