How do you choose size of venturi?

Choosing the size of a venturi involves considering factors such as the flow rate, fluid properties, and the application requirements. The throat diameter should be sized to achieve the desired pressure drop and flow velocity while minimizing losses due to turbulence. Additionally, the venturi must be compatible with the system's dimensions and ensure that it operates within the desired range for efficiency and accuracy. Calculations using fluid dynamics principles, such as Bernoulli's equation, can help determine the optimal size.