When a steady uniform stream flows over a circular cylinder, vortices are shed at a periodic rate. These are referred to as Kármán vortices. The frequency of vortex shedding f; is defined by the free-stream speed V, fluid density p, fluid viscosity µ, and cylinder diameter D. Use the Buckingham Pi method to show a dimensionless relationship for Kármán vortex shedding frequency is St = f(Re). Show all your work. D P.H

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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**Text Transcription:**

When a steady uniform stream flows over a circular cylinder, vortices are shed at a periodic rate. These are referred to as Kármán vortices. The frequency of vortex shedding \( f_k \) is defined by the free-stream speed \( V \), fluid density \( \rho \), fluid viscosity \( \mu \), and cylinder diameter \( D \). Use the Buckingham Pi method to show a dimensionless relationship for Kármán vortex shedding frequency is \( St = f(Re) \). Show all your work.

**Diagram Explanation:**

The diagram depicts a fluid flow scenario around a circular cylinder. Essential elements of the diagram include:

- A circular cylinder with diameter \( D \).
- Free-stream velocity \( V \) directed towards the cylinder.
- Viscous forces quantified by \( \rho \) (density) and \( \mu \) (viscosity) shown as incoming flow variables.
- Vortices are illustrated as swirling patterns departing from the trailing edge of the cylinder, indicating the formation of Kármán vortices.
- \( f_k \) signifies the frequency of vortex shedding.

This image helps illustrate the flow dynamics and parameters involved in the shedding of vortices behind a cylindrical object in a fluid stream.
Transcribed Image Text:**Text Transcription:** When a steady uniform stream flows over a circular cylinder, vortices are shed at a periodic rate. These are referred to as Kármán vortices. The frequency of vortex shedding \( f_k \) is defined by the free-stream speed \( V \), fluid density \( \rho \), fluid viscosity \( \mu \), and cylinder diameter \( D \). Use the Buckingham Pi method to show a dimensionless relationship for Kármán vortex shedding frequency is \( St = f(Re) \). Show all your work. **Diagram Explanation:** The diagram depicts a fluid flow scenario around a circular cylinder. Essential elements of the diagram include: - A circular cylinder with diameter \( D \). - Free-stream velocity \( V \) directed towards the cylinder. - Viscous forces quantified by \( \rho \) (density) and \( \mu \) (viscosity) shown as incoming flow variables. - Vortices are illustrated as swirling patterns departing from the trailing edge of the cylinder, indicating the formation of Kármán vortices. - \( f_k \) signifies the frequency of vortex shedding. This image helps illustrate the flow dynamics and parameters involved in the shedding of vortices behind a cylindrical object in a fluid stream.
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