# Exploring the Possibilities of a Water-Filled Flywheel

• wolram
In summary, the experts in this conversation agree that if a driven flywheel with a hollow outer rim is rapidly filled with water while in motion, the energy and momentum would remain the same but the final state would be significantly slower than the initial state due to friction. If the walls of the flywheel are frictionless and vanes are used to accelerate the water up to flywheel speed, energy and momentum would be preserved in a closed system.
wolram
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If i had a driven flywheel with a hollow outer rim, and could rapidly fill it with water while in motion, would i gain any energy?

If you will rapidly fiill it with water while moving, in the first moment water would be still, than friction would cause the water to start moving but the friction would also slow down the flywheel. Means no. You won't gain any energy.

Actually, you would lose energy. The momentum would remain the same, and the net energy would decrease. As Tominator said, the flywheel would slow down as the water accelerated, and the final state would be significantly slower than the initial state.

Assume that the flywheel has water in it but it's walls are frictionless so the water isn't moving. Then assume vanes in the flywheel are deployed to accelerate the water up to flywheel speed. Ignoring losses to heat, it's a closed system, so energy and momentum are preserved.

Ah, thanks every one.

Jeff Reid said:
Assume that the flywheel has water in it but it's walls are frictionless so the water isn't moving. Then assume vanes in the flywheel are deployed to accelerate the water up to flywheel speed. Ignoring losses to heat, it's a closed system, so energy and momentum are preserved.

True. I was thinking of kinetic energy, which would decrease (and heat would increase).

## 1. How does a water-filled flywheel work?

A water-filled flywheel works by using the kinetic energy of water to store and release energy. The flywheel consists of a large spinning wheel filled with water, which is connected to a motor. When the motor spins the flywheel, the water inside also begins to spin, storing energy in the process. This stored energy can then be released as needed to power various devices.

## 2. What are the advantages of using a water-filled flywheel?

One of the main advantages of a water-filled flywheel is its ability to store large amounts of energy in a small space. Additionally, it is a more environmentally friendly option compared to other energy storage methods, as it does not require the use of harmful chemicals or produce emissions. It also has a longer lifespan and can be easily scaled up or down depending on energy needs.

## 3. Are there any limitations to using a water-filled flywheel?

One limitation of a water-filled flywheel is its weight. The flywheel itself can be quite heavy due to the amount of water it holds, which can make transportation and installation challenging. Another limitation is the potential for leaks, which can be costly and time-consuming to repair. Additionally, flywheels are not suitable for long-term energy storage, as they can lose energy over time due to friction and evaporation.

## 4. How does a water-filled flywheel compare to other energy storage methods?

Compared to other energy storage methods such as batteries or compressed air, a water-filled flywheel has a higher energy density, meaning it can store more energy in a smaller space. It also has a longer lifespan and can withstand frequent charging and discharging without degradation. However, it may not be suitable for all energy storage needs and should be used in conjunction with other methods for a more efficient and reliable energy system.

## 5. Are there any real-world applications for a water-filled flywheel?

Yes, there are several real-world applications for a water-filled flywheel. Some examples include using it to store renewable energy from sources like solar or wind power, providing backup power during blackouts or emergencies, and balancing the energy grid by providing a stable supply of energy. It can also be used in various industries such as transportation, manufacturing, and agriculture to power machinery and equipment.

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