Problem of mixed jetting of two liquids
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Currently, an experimental setup is being developed to mix two liquids in a certain ratio and then spray them out. One of the liquids is water, while the other is a substance similar to dishwashing liquid. It is planned to use a water pump to supply water and another metering pump to supply the chemical. A flow meter is intended to be installed on the pipeline carrying the mixed liquid, so that the flow rate of the metering pump can be automatically controlled based on the signals from this flow meter, thereby maintaining a constant ratio. The question at present is whether it is necessary to keep the pressures of the two liquids roughly the same How to control it? Experts, I would appreciate your guidance on what happens when two liquids with different pressures come together. I majored in mechanical engineering, and my knowledge of fluid dynamics is basically non-existent
The pressures of the two liquids can be different, but both must be greater than the outlet pressure.
There’s no need to deliberately control the pressure. First of all, at the required flow rate, the pressure of the water pump must be higher than the resistance of the nozzle; the nozzle manufacturer will provide you with the relevant data, and you can use this data to determine the head pressure of the water pump. Finally, select a metering pump whose outlet pressure is higher than the operating head of the water pump. The pump flow rate can be adjusted via a milliampere signal. EASY.