Questions regarding the design of gas-water separators and cyclone separators

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I need to design a product that can separate moisture from flue gas. The temperature of the flue gas is around 120 degrees. I am considering using a compressor to cool the cyclone separator, with centrifugal force being used to separate the gas from the liquid. I’m not sure if this approach will work I’ve seen many pictures online showing that the inlet of cyclone separators is square-shaped – are there any specific requirements for this? Can’t it be circular? Also, the diameter of the main body at the entrance is slightly larger and it’s not circular; is it necessary to design it this way? Also, at the inlet end of the cyclone separator, aren’t the main diameter and height both required to be calculated by the company, rather than being set arbitrarily? Is there any information on this topic? Please recommend some resources; thank you very much! Xiaobai, so the questions I ask might not be professional or simple; please forgive me. I hope experts like Wangle can give me some guidance. We originally used spiral coils to cool the coils in order to remove water, but the results were not satisfactory, so we considered switching to other methods. The old plan is shown in the second image