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Viscosity and Poiseuille flow Video Lecture - NEET

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FAQs on Viscosity and Poiseuille flow Video Lecture - NEET

1. What is viscosity and how does it relate to Poiseuille flow?
Ans. Viscosity refers to the internal friction of a fluid and determines its resistance to flow. Poiseuille flow is a type of laminar flow that occurs in a cylindrical pipe or tube when a pressure difference is applied across it. Viscosity plays a crucial role in Poiseuille flow as it influences the velocity profile and the flow rate of the fluid.
2. How is viscosity measured?
Ans. Viscosity is commonly measured using a device called a viscometer. One of the widely used methods is the capillary viscometry, where the fluid is allowed to flow through a narrow capillary tube under the influence of gravity or pressure. The time taken for the fluid to flow a certain distance is recorded, and viscosity is calculated using the known dimensions of the capillary tube and the flow rate.
3. What factors affect the viscosity of a fluid?
Ans. The viscosity of a fluid is influenced by several factors. Temperature is a significant factor, as most fluids exhibit a decrease in viscosity with increasing temperature. The molecular structure and composition of the fluid also impact its viscosity. Generally, fluids with larger and more complex molecules tend to have higher viscosity. Additionally, the pressure, shear rate, and presence of impurities can affect viscosity.
4. What is the significance of Poiseuille flow in practical applications?
Ans. Poiseuille flow has various practical applications in fields like engineering, medicine, and industry. It is particularly important in fluid dynamics and the study of blood flow in blood vessels. Poiseuille flow can be used to understand and analyze the behavior of fluids in pipes, tubes, and channels, and it helps in designing efficient systems for fluid transport, such as in hydraulic systems, water supply networks, and oil pipelines.
5. How does viscosity impact the efficiency of Poiseuille flow?
Ans. Viscosity plays a crucial role in determining the efficiency of Poiseuille flow. Higher viscosity leads to greater resistance to flow, resulting in a decrease in the flow rate. This can lead to increased pressure drop and energy losses. Therefore, fluids with lower viscosity are preferred to achieve higher flow rates and more efficient fluid transport in Poiseuille flow systems.
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