The effect of bubbles in the pipeline on flow rate
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There is a piping system similar to multiple U-tubes connected in series (with a pipe diameter of 14 millimeters), which is cooled through circulation using a water tank in contact with the atmosphere and a pump set. It was found that the flow rate of the cooling water was about 40% lower compared to previous systems; it is now suspected that small air pockets at the highest points of the U-shaped tubes may be causing the diameter through which water can pass to decrease, thereby reducing the flow rate. Some experienced drivers, please step in and help analyze what might be the causes, and what measures can be taken to resolve the issue.
There should be a vent valve at the highest point; open it and check if there’s any gas
Since I’m not aware of the situation where you are, I’ll mention some possible reasons here. It’s possible that chemicals or ethylene glycol have been added to the cold water, and when the level of this liquid at the return flow inlet is high, numerous small bubbles are formed. These bubbles accumulate in the pipelines, ultimately affecting the flow rate. Solution 1: Add an antifoaming agent (considering compatibility with the water channel material) ； Option 2: Raise the liquid level to a height that submerges the return flow, thereby preventing bubbles from forming due to impact ； Option 3: Install small buffer tanks, automatic vent valves, and manual discharge valves on the pipeline. These three options can be used together or as references.
Your problem may be caused by scale formation inside the pipe, microbial accumulation, the inlet pipe, and other factors. The presence of bubbles in the liquid phase affects the flow rate of the liquid. However, it is unlikely to accumulate at the top, as the pipe diameter is small, making the possibility of air blockage extremely low. It is also related to the flow rate. Your device is likely a water bath cooler. The solution is to stop, carry out a thorough cleanup, and identify the cause. Formulate appropriate preventive measures. This tank, which is in contact with the atmosphere, also needs to be cleaned. Should corresponding filtering facilities be installed? (For reference)
The U-shaped series piping may be connected to another system; check the valves