Micro-Perforated Drip Layer (MPDL) to disrupt the gas-liquid interface

Micro-Perforated Drip Layer (MPDL) to disrupt the gas-liquid interface Jae Un Kim1 1Independent Researcher, Seoul, Korea [email protected] 1 Introduction Gas absorption in static aqueous systems is limited by diffusion-driven transport across a boundary layer near the surface. According to Henry’s law: C=kH·P the equilibrium concentration Csaturates as the partial pressure Pis maintained. However, as time progresses, the concentration gradient near the surface diminishes, and the absorption rate decays according to: dC dt =−D· ∂C ∂x We introduce the Micro-Perforated Drip Layer (MPDL), a passive, energy-efficient mechanism to disrupt the gas-liquid interface through periodic micro-droplet shear. Droplets of aqueous solution, falling through controlled perforations, locally shear the surface with momentum Φdrip, inducing surface layer renewal: dC dt =f(Φdrip, D, x, t) Unlike conventional mixing or bubbling methods, MPDL operates without global turbulence, preserving liquid clarity and minimizing secondary reactions. This paper explores the fluid dynamics of surface disruption, optimization of perforation design, and relevance for CO2capture and submerged bioreactors. 2 Table of Contents 1. Introduction 2. Mass Transfer Limitations in Static Gas-Liquid Systems 1 3. Concept of the Drip-Layer Surface Disruption Method (a) Perforation Design (b) Droplet Momentum and Surface Shear 4. Surface Renewal Model (a) Diffusion-Limited vs. Disrupted Layer Conditions (b) Generalized Absorption Kinetics 5. Prototype and Evaluation 6. Application in CO2Capture and Aqueous Reactors 7. Conclusion 2