This diagram shows a water circulation system which operates also at large gravities.

The pumping system is driven by compressed air. Advantage of the system is that the design is very simple and not senstive for e.g. sand. Furthermore good control of the water flow is possible from zero to the maximum capacity. A disadvantage is the large air consumption. This makes the pump less suitable for long term tests. For lower gravities (up to 50g) miniature gear wheel pumps were successfully applied.

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