![]() ![]() Can anyone think of a fluid that flows very quickly? (Possible answers: Water, soda, juice.) Can anyone think of a fluid that flows very slowly? (Possible answers: Honey, cream, oil.) Many different factors can govern how fast a fluid flows including the chemical properties of the solution such as the types of chemical bonds that the solution is comprised of, the homogeneity/ heterogeneity and thickness of the solution. Not all fluids flow at the same rate some may come out of a container very quickly, while others may take some time to empty out. What do all these different solutions have in common and why we are talking about them? Well, all these solutions may exist as either a homogenous (uniform solution) or heterogeneous (assorted mixture solution) and they all have a flow associated with them. Which ones come to mind? (Listen to student ideas.) Think of water, shampoo, mouthwash, sodas, milk, chicken broth, orange juice, ketchup, oils, lotion, vinegar, anti-freeze, window cleaner, and the list goes on. Have you ever really looked at all the items at your home? You probably have 100s of different fluids. Identify dependent and independent variables in an experiment.Ĭopyright © 2012 Yeri Park, Polytechnic Institute of NYU. ![]() Collect and analyze data from an experimental set-up.Explain the importance of viscosity consideration in scientific use and engineering applications.Describe the relationship between viscosity and flow rate, and extrapolate information from it.Explain the reasoning behind the varying flow rates of milks with various fat content.Understanding the relationship between viscosity and flow rate are essential in any engineering process involving liquids!Īfter this activity, students should be able to: Mechanical engineers who design combustion engines consider the liquid flow rate of oils, petroleums and fuels under different conditions. In the design of artificial heart valves and vascular stents, biomedical engineers must have an intimate knowledge of the flow rate and properties of blood when it flows through arteries and veins in order to design devices that function correctly. ![]() Chemical engineers design chemicals of very different viscosities(ranging from rubber to petroleum to alcohols and aqueous solutions) and all their processes and reactions must take into account the flow rate of these substances. This engineering curriculum aligns to Next Generation Science Standards ( NGSS).Įngineers commonly design equipment or devices that requires them to take into consideration the viscosity of particular fluids. Ultimately, students gain an understanding of the concept of viscosity and its effect on flow rate. ![]() For example, heavy cream flows at a slower rate than skim milk. To identify the unknowns requires an understanding of the concept of viscosity. They examine control samples and unknown samples, which they must identify based on how fast they flow. They explore these properties in milk and cream, which are common fluids whose properties (and even taste!) differ based on fat content. Student groups conduct a brief experiment in which they quantify the flow rate to understand how it relates to a fluid's viscosity and ultimately chemical composition. Students study the physical properties of different fluids and investigate the relationship between the viscosities of liquid and how fast they flow through a confined area. ![]()
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