Problem 6. A material is \"shear-thinning\" if it becomes less viscous at high s

Question

Problem 6. A material is "shear-thinning" if it becomes less viscous at high shear rates and "shear-thickening" if it becomes more viscous at high shear rates. i) Would it be easier to get ketchup (a shear-thinning liquid) out of a bottle by shaking it or letting it drain while stationary? Explain. ii) We used 2 parts of corn starch in 1 part of water in class to make oobleck. What happens to this mixture when you stir it rapidly and when you stir it slowly. Based on the observations in class (or watch a video on Youtube) is it shear- thickening or shear-thinning material.

Explanation / Answer

i) as ketch up is shear thinning fluid . So it will become less viscous at high shear rate. Thus, if we shake it vigorously it will become thinner and hence will come out of the bottle easily

ii) as we can see in you tube videos, if one stands on oobleck one intrudes in the mixture. but if one moves rapidly the surface hold the weighty. Thus oin application of higher shear rate the mixture shows more viscosity. Thus it is shear thickening

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.