Video explaining viscosity, a key property in fluid mechanics that describes how easily a fluid will flow.
Viscosity is a key property in fluid mechanics that describes how easily a fluid will flow. The video starts by defining viscosity using Newton's Law of Viscosity, that describes the linear relationship between the shear stress in the fluid and the strain rate, and how it relates to the dynamic and kinematic viscosities. It also explores how viscosity is dependent on temperature - the viscosity of liquids reduces with increasing temperature, but for gases temperature has the opposite effect. Another interesting aspect of viscosity that's covered in the video is non-Newtonian fluids, like shear thinning or shear thickening fluids, for which the relationship between the shear stress and the strain rate is non-linear.
Type of Material:
Animation (video)
Recommended Uses:
It could be recommended for courses on mechanical properties of materials in fluid mechanics engineering topics. Useful for traditional and hybrid/blended teaching
Technical Requirements:
Mozilla Firefox, Google Chrome and Microsoft Edge browsers were used to access the material. It seems that all facilities are active for any browser.
Identify Major Learning Goals:
This video is a good tool to help understand what viscosity is, its dependence on other properties, and its molecular behavior to anybody interested in having knowledge about general concepts on this transport property, such as students of engineering degrees.
Target Student Population:
College Upper Division, Professional, First or sedond course Degrees.
Prerequisite Knowledge or Skills:
Knowledge on physics and chemistry at high school level.
Content Quality
Rating:
Strengths:
The video presents a look at viscosity, a key property in fluid mechanics that describes how easily a fluid will flow. It starts by defining viscosity using Newton's Law of Viscosity, that describes the linear relationship between the shear stress in the fluid and the strain rate, and how it relates to the dynamic and kinematic viscosities. The video also explores how viscosity is dependent on temperature - the viscosity of liquids reduces with increasing temperature, but for gases temperature has the opposite effect. The video explains this by looking at what causes viscosity on the molecular level. Another interesting aspect of viscosity that's covered in the video is non-Newtonian fluids, like shear thinning or shear thickening fluids, for which the relationship between the shear stress and the strain rate is non-linear. Contents are presented in a clear and concise manner. The contents are core concepts in basic fluid mechanics in engineering courses. Information is provided accurately and summarizes well the main ideas.
The use of equations reinforces the oral explanation.
Concerns:
To deepen a bit more in the concept of Non-Newtonian fluids should be interesting.
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
The material could be used for self-learning as well as a supplementary material in traditional or blended/hybrid courses on fluid mechanics. The learning objectives are clearly stated. Physical phenomena and equations concerning viscosity are presented graphically, easy to understand.
The major strength of this material is its presentation, the support given by the use of equation, and its length. These are the optimal to help students acquire concepts without being boring.
Concerns:
As corresponds to video materials, to become useful for effective learning it should be combined with extra exercises and quizzes, or to become integral part of additional lectures on the topic of fluid mechanics.
Ease of Use for Both Students and Faculty
Rating:
Strengths:
The video is a standalone material, easy to use. Only connection to the Internet and link to the video repository is needed. It can be reproduced in computer, iPad and smartphone. Visual design of the video corresponds to a succession of pictures as the explanations are given.
Concerns:
As corresponds to video materials, limited interactivity.
It should be interesting to include subtitles in other languages in common use (Spanish, French…), or video voice in other languages.
Creative Commons:
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