Calculating Flux on a Curved Surface in Cylinder Coordinates

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In summary, the problem is asking to find the flux out of the curved part of the surface of a given solid T, which is defined in cylinder coordinates. The vector field F is given and the normal vector n is calculated. The solution involves integrating over theta and z using the appropriate dS value.
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kasse
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Homework Statement



The following vector field is given: F = < x + y^3, y, z - y^3 >

Let T be the solid given in cylinder coordinates by: r [0,1], tetha [0, pi], z [0, 2]

Find the flux out of the curved part of the surface of T.

2. The attempt at a solution

The normal vector n is < x, y, 0 >

F*n is therefore 1 + xy^3

Then I need dS = sqrt(1 + zx2 + zy2) dx dy. Is this simply 1 dx dy?
 
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  • #2
But x and y aren't the variables you are going to integrate over, are they? Don't you want to integrate over theta and z? (You are sort of right, in the sense that dS is independent of the integration variables, if you choose them correctly).
 

1. What is flux in cylinder coordinates?

Flux is a measure of the flow of a quantity, such as temperature or electric charge, through a surface. In cylinder coordinates, the surface is curved, making the calculation of flux more complex.

2. How do you calculate flux in cylinder coordinates?

To calculate flux in cylinder coordinates, you must first determine the normal vector to the curved surface. Then, you can use the dot product of the normal vector and the vector representing the flow to determine the flux.

3. What is the formula for calculating flux on a curved surface in cylinder coordinates?

The formula for calculating flux on a curved surface in cylinder coordinates is: Flux = ∫∫ (F⋅n) dS, where F represents the vector field, n is the normal vector, and dS is the area element on the curved surface.

4. How does the curvature of the surface affect the calculation of flux in cylinder coordinates?

The curvature of the surface affects the calculation of flux in cylinder coordinates because it changes the direction of the normal vector at each point on the surface. This means that the dot product between the normal vector and the vector representing the flow will vary at different points, making the calculation more complex.

5. What are some real-world applications of calculating flux on a curved surface in cylinder coordinates?

Calculating flux on a curved surface in cylinder coordinates has many real-world applications, including calculating the flow of fluids in pipes, determining the heat transfer in curved surfaces, and calculating the flow of electric charge in cylindrical conductors.

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