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The two critical variables for flow rate will be resistance and diameter/area of flow. The holes in the outer zones could be over drilled to increase their diameters. If that is not an option then reducing the number of holes in the central zone and increasing the number of holes in the out zone would help. Alternatively, as others have stated, you could ...

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you could add a diverter fin like a n inverse V inside to give favore to the side openins and deny direct suction from center openings. as per my sketch.

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I would suggest separate channels to each set of holes with orifice plates to limit the flow to / from each. That way you can control each set individually. The other solution will be to over-specify the flow rate so that the poorest one is sufficient...

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It will be a next to impossible task to try and analytically predict the number/position/size of the holes in order to have exactly the same flow. Even if you do for a temperature and a set humidity, at different temperatures you might have unacceptable results. If you are really interested in equalising the flows, a better alternative is to use a flow ...

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What you are seeing in the video is a vacuum generator/vacuum ejector/aspirator. Figure 1: Venturi effect (source: wikipedia) It uses the principle of the Venturi effect. I.e. that for steady, incompressible, inviscid when there is an increase of speed there is a drop in static pressure. This is mathematically expressed as: p_1-p_2 =\frac{\rho}{2} (v_2^2- ...

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A pilot operated valve (often unfortunately generalized as a "solenoid valve") uses a small control solenoid valve and the pressure differential across the valve to open a diaphragm that allows flow to pass. This is a very common design because it allows for a large flow to be controlled with very little energy. This YouTube video has a good ...

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