Instabilized Heat and Mass Transfer in Exothermic Chemically Reacting Flows

概要

論文の詳細を見る
Influence of the Rayleigh-Taylor instability on heat and mass transfer in chemically reacting flow for the reciprocal resolvable solvents has been studied using Hele-Shaw cell. In order to investigate how the Rayleigh-Taylor instability affects on the propagation of the reaction front, ethanol was added into the solvent. Measurements at the reaction front demonstrated that the predominant method of mass transfer changes from the diffusion to the convection depending on the mass fraction of ethanol. When the Atwood number, At, is greater than 0, mass transfer is controlled by the natural convection. In such case, the mass flow rate increases due to the increment of the contact area between protons (H+) and hydroxide ions (OH-). In such case, the temperature in the cell becomes higher than that for At < 0. Furthermore, mass transfer has been investigated with changing the type of acid aqueous solution. As hydrochloric acid (HCl) dissolves fully in the aqueous solution, enough amount of H+ is present to react with OH-. On the other hands, since the dissolution rate from acetic acid (CH3COOH) to proton is very slow, few protons exist in the aqueous solution. As the result, the propagation of the reaction front in CH3COOH-sodium hydroxide (NaOH) system was slower than that in HCl-NaOH system.
社団法人日本伝熱学会の論文
2009-07-01