Meaning
Venturi-based liquid circulation systems generate high-velocity solution movement inside chemical process tanks by leveraging kinetic energy transfer. Pressurized fluid discharged through an internal nozzle entrains surrounding tank liquid, creating a high-volume output stream aimed directly at target substrates. Utilizing eductor impingement forces fresh plating solution deep into microvia cavities and narrow blind holes.
Operational effectiveness stops when pump pressure drops below venturi suction thresholds or when nozzle orifices suffer physical blockage.
Fluid Acceleration
High-pressure centrifugal pumps supply primary fluid to submerged venturi nozzles positioned along tank walls. Primary liquid exiting the small nozzle orifice creates a localized low-pressure zone that draws four to five times its volume in surrounding solution into the secondary flow cone. Directing eductor impingement toward submerged circuit panels delivers high kinetic energy fluid streams that break down stagnant liquid boundary layers.
Focused jet flow drives rapid solution exchange across panel faces, carrying active additives directly into microvia openings. Industrial wet-process equipment certified under Chinese National Standard GB 50014 incorporates adjustable eductor manifold assemblies to optimize flow distribution across varying panel dimensions. Fluid recirculation rates achieved through venturi action eliminate localized solution stagnation without requiring excessive pump horsepower.
Continuous liquid impact removes gas bubbles and maintains uniform chemical concentration across target surfaces.
Mass Transfer
Submerged fluid jets create localized high shear zones that accelerate mass transport of copper ions to the cathode. Rapid liquid replacement prevents localized cupric ion depletion inside high aspect ratio microvias during electrodeposition. Sustaining eductor impingement elevates permissible cathode current density while preventing burned copper deposits on panel surfaces.
Optimized fluid transport enables faster plating cycle times and improves deposit grain structure.
Velocity Limit
Excessive jet velocity can cause physical panel flexing, non-uniform plating thickness, and organic additive stripping. Direct fluid impact against panel surfaces must be balanced across both sides of the substrate carrier to prevent warping. Process engineers configure nozzle spacing and fluid manifold pressure to establish uniform flow fields across the entire tank volume.
Excessive fluid velocity disrupts delicate laminar flow regimes required for bottom-up microvia filling.
