JEE  >  Reynolds Number : Viscosity and Poiseuille flow

# Reynolds Number : Viscosity and Poiseuille flow Video Lecture - Physics for JEE Main & Advanced

## FAQs on Reynolds Number : Viscosity and Poiseuille flow Video Lecture - Physics for JEE Main & Advanced

 1. What is the Reynolds number and how is it calculated?
Ans. The Reynolds number is a dimensionless quantity used to determine the flow characteristics of a fluid. It is calculated by dividing the product of the fluid's velocity, characteristic length, and density by its dynamic viscosity.
 2. What is viscosity and how does it affect fluid flow?
Ans. Viscosity is a measure of a fluid's resistance to flow. It determines how easily a fluid can flow under the influence of an external force. Higher viscosity fluids have thicker consistency and flow more slowly, while lower viscosity fluids flow more easily.
 3. What is Poiseuille flow and what factors affect it?
Ans. Poiseuille flow refers to the steady, laminar flow of an incompressible fluid through a cylindrical pipe or vessel. The flow is driven by a pressure difference and is characterized by a parabolic velocity profile. The flow rate in Poiseuille flow is influenced by factors such as the viscosity of the fluid, the length and radius of the pipe, and the pressure difference applied.
 4. How does the Reynolds number relate to the flow regime in a pipe?
Ans. The Reynolds number helps determine the flow regime in a pipe. For low Reynolds numbers, the flow is laminar and exhibits smooth, orderly motion. As the Reynolds number increases, the flow transitions to turbulent, characterized by chaotic, irregular motion. The critical Reynolds number for this transition varies depending on factors such as pipe roughness and flow conditions.
 5. How does the viscosity of a fluid affect the flow rate in Poiseuille flow?
Ans. The viscosity of a fluid directly affects the flow rate in Poiseuille flow. Higher viscosity fluids experience greater resistance to flow, resulting in lower flow rates. In contrast, lower viscosity fluids flow more easily and exhibit higher flow rates. The relationship between viscosity and flow rate is inversely proportional in Poiseuille flow.

## Physics for JEE Main & Advanced

307 videos|654 docs|262 tests

## Physics for JEE Main & Advanced

307 videos|654 docs|262 tests

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