How does the tube inner diameter affect the flow rate?

The main purpose of this theme is. Because there are some customers. When they find the flow rate is not enough. They will try to find bigger pumps with higher flow rate. But in fact it did not improve his current situation. Just because of the tube. The cross-sectional area is too small. It will cause the flow rate could not be increased. It has its limitation.

To do the experiment for you today. I prepared for this experiment. There are three kinds of connections to simulate the different flow rate. Each is The inner tube with 8mm, 6mm, 4mm. To simulate different sizes of inner tubes.

The Vacuum pump UN-200V has a pumping capacity of 200 L / min. Then this our experiment. Then it is through the method of pumping. Through the flowmeter. To get the influence problem. The simulation is at the end. Through three different calibers of the parts.

First install the 8mm connection. Power-on. Current flow rate Over 200 L/min. It means that an inner diameter of 8mm does not affect our maximum flow rate. The flow rate of the cross-sectional area exceeds 200 L / min. Then we test 6mm parts. The inner diameter of the tube is slightly smaller. The flow rate still exceeds 200 L / min. It means that an inner diameter of 6mm. also can work for pumping flow rate of 200 L / min. Test parts with an inner diameter of 4mm. The flow rate right now. It is obvious to see the flow rate is lower than 100 L / min. Only left 90 L / min. The current 4mm parts. Caused the Flow rate of the pump cannot reach 100 L / min. It only can reach around 90 L / min. Then right now we Prove it. After removing this tube (4mm)
Its flow rate returns to the maximum flow rate of 200 L / min.

Then it can prove that the current tube inner diameter. If it’s too small. Then it will influence the flow rate of the pump.

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