The issue with air flow rate
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I have a question: A few days ago I came across the statement that \"the flow velocity decreases in a container that suddenly expands.\" Is the flow velocity inside the heat exchange tubes equal to the flow velocity inside the tube bank? If that is indeed the case, can separation be achieved by increasing the length of the heat exchanger tube bank?
The steady flow rate is conserved; as the vertical cross-section through which the flow passes increases, the flow velocity must decrease. An extended tube box certainly helps with separation, but whether it can achieve the level of separation you require depends on design and calculations. Through design and calculation, it is possible to determine how long the tube box should be, what type of demister to use, what material to select in the absence of baffles, and so on.