In a steady one-dimensional (x-direction) flow, two points A and B are 2 m apart in the x-direction. From point A to B, the fluid velocity varies from 3 m/s to 7 m/s.What will the fluid acceleration be at point B ? Hint: Think about the terms on the left hand side of the Euler equation i.e: du/dt+u(du/dx), and what these actually mean...Group of answer choices12 m/s^214 m/s^216 m/s^24 m/s^2
Question
In a steady one-dimensional (x-direction) flow, two points A and B are 2 m apart in the x-direction. From point A to B, the fluid velocity varies from 3 m/s to 7 m/s.What will the fluid acceleration be at point B ? Hint: Think about the terms on the left hand side of the Euler equation i.e: du/dt+u(du/dx), and what these actually mean...Group of answer choices12 m/s^214 m/s^216 m/s^24 m/s^2
Solution 1
The fluid acceleration at point B can be calculated using the Euler equation. The Euler equation in one dimension is given by:
du/dt + u(du/dx) = -1/ρ(dp/dx) + g
where:
- du/dt is the local acceleration (change in velocity with respect to time),
- u(du/dx) is the convective acceleration (change in velocity with respect to position),
- dp/dx is the pressure gradient,
- ρ is the fluid density, and
- g is the gravitational acceleration.
In this case, we are asked to find the fluid acceleration at point B. Since the flow is steady, the local acceleration (du/dt) is zero. Therefore, the fluid acceleration is given by the convective acceleration term, u(du/dx).
The change in velocity (du) from point A to B is 7 m/s - 3 m/s = 4 m/s. The change in position (dx) is 2 m. Therefore, the convective acceleration is:
u(du/dx) = 7 m/s * (4 m/s / 2 m) = 14 m/s^2
So, the fluid acceleration at point B is 14 m/s^2.
Solution 2
Solution 3
The fluid acceleration at point B can be calculated using the Euler equation. The Euler equation in one dimension is given by:
du/dt + u(du/dx) = -1/ρ(dp/dx) + g
where:
- du/dt is the local acceleration (change in velocity with respect to time),
- u(du/dx) is the convective acceleration (change in velocity with respect to position),
- dp/dx is the pressure gradient,
- ρ is the fluid density, and
- g is the gravitational acceleration.
In this case, we are interested in the convective acceleration at point B. The convective acceleration is given by the product of the velocity and the rate of change of velocity with respect to position, i.e., u(du/dx).
The velocity at point B is given as 7 m/s. The rate of change of velocity with respect to position (du/dx) can be calculated as the change in velocity divided by the change in position. The change in velocity from point A to B is 7 m/s - 3 m/s = 4 m/s, and the change in position is 2 m. Therefore, du/dx = 4 m/s / 2 m = 2 s^-1.
Substituting these values into the equation for convective acceleration gives:
u(du/dx) = 7 m/s * 2 s^-1 = 14 m/s^2
Therefore, the fluid acceleration at point B is 14 m/s^2.
Solution 4
The fluid acceleration at point B can be calculated using the Euler equation. However, in this case, the flow is steady, which means the term du/dt is zero because the velocity does not change with time.
The only term left is u(du/dx), which represents the convective acceleration.
The change in velocity (du) is 7 m/s - 3 m/s = 4 m/s. The change in position (dx) is 2 m.
So, du/dx = 4 m/s / 2 m = 2 s^-1.
The velocity at point B is 7 m/s.
Therefore, the acceleration at point B is u(du/dx) = 7 m/s * 2 s^-1 = 14 m/s^2.
So, the fluid acceleration at point B is 14 m/s^2.
Solution 5
The fluid acceleration at point B can be calculated using the Euler equation. The Euler equation in one dimension is given by:
du/dt + u(du/dx) = -1/ρ(dp/dx) + g
where:
- du/dt is the local acceleration (change in velocity with respect to time),
- u(du/dx) is the convective acceleration (change in velocity with respect to position),
- dp/dx is the pressure gradient,
- ρ is the fluid density, and
- g is the gravitational acceleration.
In this case, we are interested in the convective acceleration term, u(du/dx), because the problem states that the flow is steady (which means du/dt = 0) and one-dimensional (which means the pressure gradient and gravity are not changing in the x-direction).
The convective acceleration is calculated by multiplying the velocity of the fluid by the rate of change of velocity with respect to position. The velocity changes from 3 m/s at point A to 7 m/s at point B over a distance of 2 m, so the rate of change of velocity with respect to position is (7 m/s - 3 m/s) / 2 m = 2 m/s^2.
Therefore, the convective acceleration at point B is u(du/dx) = 7 m/s * 2 m/s^2 = 14 m/s^2.
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