Water hammer. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Water hammer. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Let's do some experiments with a moving fluid.

When water is splashed out, for example, from a bucket, the hands with the bucket, rapidly moving forward, stop abruptly, and the water, now by inertia, continues to move - and splashes out.

When you shake a medical thermometer, with a sudden stop of the hand, mercury, continuing to move in a thin tubule, falls to its place in the can.

On pipelines through which liquids are transported (for example, these are oil pipelines), valves are installed that do not act immediately, but open and close the pipe gradually. And that's why. When the valve is suddenly closed, the liquid stops immediately, and a strong blow occurs to the pipe walls and to the valve itself. An accident occurs: the pipe bursts, the valve breaks. Therefore, liquids flowing through pipes must be stopped slowly, gradually.

To observe how a liquid such as water behaves when it is abruptly stopped, do the following experiment.

Take a long rubber tube about a finger thick. Dip one end of it into a bucket of water placed on a raised platform. At a distance of 10 centimeters from the other end of the tube, make a small hole and insert a pipette into it, removing the rubber band from it. Pinch the tip of the pipette with your finger, suck water through the rubber tube. She will pour from the bucket into the basin, standing on the floor. Quickly close and open the end of the rubber tube with your finger. With each closing, the stream of the fountain from the pipette will bounce high, but will immediately drop, turning into a small fountain. (Try the same experiment without a pipette.)

Water hammer

Liquids are almost incompressible, and the inertia of water, with a sudden blockage of the flow, creates a large drop - this is where the fountain splashes.

Author: Rabiza F.V.

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