How do I create a contained coolant flow model for a school science project?

How do I create a contained coolant flow model for a school science project?
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Answer :

You need to find a way to build in a “reservoir” with an air inlet to allow air flow. A flask like container with a rubber cork you can get a a science surplus store for cheap. One tube goes to the bottom to draw up the liquid in the flask the other comes back and should stay above the fill level to return the liquid to the flask. A plastic bladder could work also and maybe even eliminate the need for an air inlet as it could expand and contract with the pump cycle.
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