CONVECTIVE MASS TRANSFER COEFFICIENT MEASUREMENT TECHNIQUES

Mass transfer is one of the most important processes in all engineering systems, especially in chemical processes. Mass transfer at the micro- and macroscales, resistances encountered during mass transfer, types of mass transfer, and the measurement of mass transfer rates are key topics. In this context, the methods used to measure the mass transfer coefficient play a key role in measuring mass transfer rates. Since the fluid flow occurs within closed channels and systems, especially in engineering contexts, understanding the mass transfer and determining its rate between a solid surface and a fluid are of primary importance. The most commonly used methods are the Electrochemical Limiting Diffusion Current Technique (ELDCT) and the Napthalene Sublimation Technique (NST). This study reviews the advantages and disadvantages of both methods based on the literature. It is found that ELDCT is suitable for determining convective mass transfer coefficients in liquid fluid flow systems with strongly turbulent conditions. However, NST is more appropriate for gas fluid flow systems.