G221 Concentration Measurement in Vicinity of Neutralization Reaction Interface using Near-infrared Absorption Imaging Technique

Abstract

This paper focuses on the mixing phenomena at the neutralization reaction interface in a microchannel. Visualization of diffusion and chemical reaction of the aqueous solutions of hydrochloric acid and sodium hydroxide in microchannel is performed by using a novel imaging technique based on the near-infrared absorption spectroscopy of aqueous solutions. We observe the salt generation and diffusion by the reaction when the flow of the two reagents and gravitational directions are changed. The results show that salt diffusion phenomena are greatly influenced by gravitational direction.