Energy Flow from Low to High: Exploring the Water Flow

In summary, the conversation discusses the flow of water from a higher energy level to a lower energy level, as described by the equation Pa + za + (Va)^2/2g. It is noted that the pressure differences play a role in determining the direction of the flow. The question is raised as to why the water flows from B to A instead of A to B, and the answer is suggested to be related to the pressure values supporting the flow.
  • #1
foo9008
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Homework Statement


As we all know , energy will lose from high to low. in the equation , the energy at A ( Pa +za +](Va)^2 ]/2g ) is higher , while the energy at B is lower. So, why the water flow from B to A ? why not A to B ?
20.39 +10.52-hf = 32.98

Homework Equations

The Attempt at a Solution

 

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  • #2
foo9008 said:

Homework Statement


As we all know , energy will lose from high to low. in the equation , the energy at A ( Pa +za +](Va)^2 ]/2g ) is higher , while the energy at B is lower. So, why the water flow from B to A ? why not A to B ?
20.39 +10.52-hf = 32.98

Homework Equations

The Attempt at a Solution

You forgot the pressure differences.
 
  • #3
foo9008 said:
As we all know , energy will lose from high to low. in the equation , the energy at A ( Pa +za +](Va)^2 ]/2g ) is higher , while the energy at B is lower. So, why the water flow from B to A ? why not A to B ?

chek the pressure values -it must be supporting the flow? that's how one pumps water to higher levels!
 
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Related to Energy Flow from Low to High: Exploring the Water Flow

1. What is the concept of energy flow from low to high?

The concept of energy flow from low to high refers to the movement of energy from a lower level to a higher level. This can occur in various systems, such as the movement of heat from a cooler object to a warmer object or the transfer of electrical energy from a lower voltage to a higher voltage.

2. How does water flow demonstrate energy flow from low to high?

Water flow is a perfect example of energy flow from low to high. As water flows downhill, it is moving from a higher gravitational potential energy to a lower one. However, as the water reaches a lower point, such as a dam, it can be harnessed to produce energy by flowing to a higher point.

3. What factors affect the efficiency of energy flow from low to high in water systems?

The efficiency of energy flow from low to high in water systems can be affected by various factors such as the design of the system, the viscosity of the water, and the presence of obstacles or friction. Additionally, the amount of water and the distance it needs to travel can also impact the efficiency of energy transfer.

4. Can energy flow from low to high be reversed?

Yes, energy flow from low to high can be reversed through the use of external energy sources. For example, a pump can be used to move water from a lower point to a higher point, thus reversing the direction of energy flow.

5. How is energy flow from low to high relevant in everyday life?

Energy flow from low to high is relevant in many aspects of everyday life. It is the principle behind many renewable energy sources, such as hydroelectric power, where water is used to generate electricity by flowing from a lower to a higher point. Additionally, it plays a role in the water cycle, where water evaporates from the ocean (lower point) and falls as rain on mountains (higher point).

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