Colloid Particle Adsorption in the Slot Impinging Jet Cell

Area of Science:

• Fluid dynamics
• Mass transfer
• Surface science

Background:

• Understanding flow distribution is crucial for optimizing mass transfer processes.
• The slot impinging jet (SIJ) cell is a relevant model for studying fluid behavior near surfaces.
• Previous models often simplify the complex flow dynamics in such cells.

Purpose of the Study:

• To describe flow distribution in the SIJ cell.
• To derive and solve a mass transfer equation for predicting adsorption rates.
• To experimentally validate theoretical predictions and investigate deposition uniformity.

Main Methods:

• Numerical solutions of Navier-Stokes equations for flow field analysis.
• Derivation and numerical solution of the mass transfer equation.
• Experimental verification using polystyrene latex particles.
• Brownian dynamics simulations to account for scattering effects.

Main Results:

• Flow in the SIJ cell resembles flow near a cylinder for Re < 30.
• Plane-parallel stagnation flow approximation is valid for x/d < 0.25.
• Good agreement between predicted and measured initial flux for various conditions (Re, ionic strength).
• Uniform particle accessibility observed for x/d < 0.5.
• Hydrodynamic scattering explains deviations at larger distances and higher coverages.

Conclusions:

• The SIJ cell offers uniform particle accessibility at short distances (x/d < 0.5).
• Theoretical models accurately predict initial adsorption rates under various conditions.
• Hydrodynamic scattering is a significant factor influencing deposition rates at higher coverages and Re.
• Brownian dynamics simulations effectively model scattering phenomena.