Fluids: potential flow, calculating gauge pressure from two sources

In summary, the problem involves a plane onset flow with two sources at different locations and strengths. The task is to calculate the gauge pressure at a specific point (0,2m) by finding the magnitude and components of the velocity vectors associated with each source and the overall flow, as well as the velocity at infinity. The gauge pressure is then determined by subtracting the pressure at infinity from the pressure at the specified point.
  • #1
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Homework Statement



In a plane onset flow of 4 m/s, a source of strength 13 m2/s per metre is located at the origin (x=0, y=0) and another source of strength 18 m2/s per metre is located at (x=3m, y=0). Calculate the gauge pressure at the point (0, 2m), Take ρ =1.2kg/m3

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Homework Equations



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The Attempt at a Solution



I have attempted to work out the velocities, 13/(2pi*√x^2+y^2) and 18/(2pi*√(x-3)^2+y^2) and θ = 1.249 radians, although am somewhat unsure of how to proceed.

any help would be greatly appreciated! thanks
 
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  • #2
What is the magnitude of the velocity vector associated with each of the two sources at the point p?

What are the components of these velocity vectors in the x- and y-directions at point p?

What are the components of the velocity vector associated with the flow U at point p?

What are the components of the overall velocity vector at point p?

What are the components of the velocity of the fluid at infinity?

I presume that you need to calculate the gauge pressure as the pressure at point p minus the pressure at infinity.
 

Related to Fluids: potential flow, calculating gauge pressure from two sources

1. What is potential flow in fluid dynamics?

Potential flow is a type of fluid flow where the velocity of the fluid is irrotational, meaning it has no vorticity. This means that the fluid particles move in a smooth, orderly manner and do not rotate or swirl.

2. How is potential flow different from other types of fluid flow?

Potential flow is different from other types of fluid flow, such as turbulent or viscous flow, because it assumes that the fluid is inviscid (has no internal friction) and incompressible (does not change density). It also neglects the effects of boundary layers and turbulence.

3. How do you calculate gauge pressure in potential flow from two sources?

To calculate gauge pressure in potential flow from two sources, you can use Bernoulli's equation, which states that the sum of the pressure, kinetic energy, and potential energy per unit volume is constant along a streamline. By equating the pressures from the two sources at a given point, you can solve for the gauge pressure.

4. What are some practical applications of potential flow in engineering?

Potential flow has many practical applications in engineering, such as in the design of aircraft wings and propellers, as well as in the analysis of fluid flow in pipes and channels. It is also used in the design of pumps and turbines, and in the study of flow around objects in aerodynamics and hydrodynamics.

5. Are there any limitations to using potential flow in real-world situations?

While potential flow is a useful simplification in many cases, it does have some limitations. It can only be applied to inviscid, incompressible fluids, which may not accurately represent real fluids. It also neglects the effects of turbulence and boundary layers, which can have a significant impact on the behavior of fluids in certain situations.

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