How Does The Water Rotameter Work?

　　How does the Water Rotameter work?

　　The Water Rotameter is a form of variable area flow meter that has a simple operation whereby a liquid or gas passes through a conical tube. In order for this gas to pass through the pipe, it must first raise the float fixed in the pipe.

　　When the Water Rotameter is used with liquid, the float will rise due to the combination of the velocity of the fluid and the buoyancy of the liquid.

　　For gas, the buoyancy is negligible, and due to the velocity of the gas, the float will move in most cases. In both cases, the higher the flow, the higher the float will move above the tube. The float moves up and down in the tapered tube in proportion to the flow rate and the annular area between the float and the tapered tube wall. Due to the tapered nature of the float, the annular opening increases when the float moves upward through the tube. As this increases, the pressure difference across the float decreases. When the weight of the float is balanced with the upward force exerted by the fluid or gas, the float is stable.

　　The float can then be compared with the calibration scale, either printed on the pipe itself or placed next to the pipe outside the flowmeter. The calibration scale usually gives a volume flow reading, such as liters per minute (LPM).

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