ELECTROCHEMICAL METHOD TO DETERMINE THE LOCAL COMPOSITION OF A LIQUID PHASE WITHIN A SOLIDIFYING NH4CL-H2O SYSTEM

摘要: Knowledge of liquid composition distribution is needed for improved understanding energy and species transports occurring during mixture solidification. This paper describes an experimental diagnostic technique monitoring the solute concentration ammonium chloride aqueous solution undergoing a phase change without resort to sampling procedure. The method based on principles electrochemical cell can be extended any binary salt having anions. successive chloriding dechloriding working electrode employed eliminate influence drift caused by dissolution silver layer in high environment. was applied diffusion controlled solidification measure transient with uncertainty ±2.5%. simultaneously measured temperature data confirmed nonequilibrium undercooling interdentritic ...