[RedDevil]

There can be something else at play too.
The air trapped in the wheel well moves with the car, more or less. The air outside of the wheel is pretty much standing still.
This may cause a pressure difference, but I cannot work out whether this would suck the air through the wheel, and if in which direction that would be.

With solid wheels or moon disks it would not happen, that's for sure.

I wonder whether the wheel can help dissipate brake heat. The brakes are fitted to the hub, not the wheel itself; otherwise changing tires would be cumbersome.
Nonetheless, if the wheel can double as a heat sink then (semi) solids may be more effective at cooling the brakes than spoked wheels...