Fundamental Drop Dynamics and Mass Transfer Experiments to Support Solvent Extraction Modeling Efforts

Kristi Christensen ; Veronica Rutledge ; Troy Garn

关键词: CAMERAS;    DISTRIBUTION;    EXTRACTION APPARATUSES;    EXTRACTION COLUMNS;    IDAHO NATIONAL LABORATORY;    LANL;    MASS TRANSFER;    MIXER-SETTLERS;    NUCLEAR ENERGY;    PHYSICAL PROPERTIES;    SAFEGUARDS;    SELF-DIFFUSION;    SHAPE;    SOLVENT EXTRACTION;    SURFACE TENSION;    VELOCITY;    VISCOSITY drop contact;    drop dynamics;    mass transfer coefficient;    mass transfer rate;    TRUEX fluid properties;   

DOI  :  10.2172/1033906
RP-ID  :  INL/EXT-11-23426
PID  :  OSTI ID: 1033906
Others  :  TRN: US1200679

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

In support of the Nuclear Energy Advanced Modeling Simulation Safeguards and Separations (NEAMS SafeSep) program, the Idaho National Laboratory (INL) worked in collaboration with Los Alamos National Laboratory (LANL) to further a modeling effort designed to predict mass transfer behavior for selected metal species between individual dispersed drops and a continuous phase in a two phase liquid-liquid extraction (LLE) system. The purpose of the model is to understand the fundamental processes of mass transfer that occur at the drop interface. This fundamental understanding can be extended to support modeling of larger LLE equipment such as mixer settlers, pulse columns, and centrifugal contactors. The work performed at the INL involved gathering the necessary experimental data to support the modeling effort. A custom experimental apparatus was designed and built for performing drop contact experiments to measure mass transfer coefficients as a function of contact time. A high speed digital camera was used in conjunction with the apparatus to measure size, shape, and velocity of the drops. In addition to drop data, the physical properties of the experimental fluids were measured to be used as input data for the model. Physical properties measurements included density, viscosity, surface tension and interfacial tension. Additionally, self diffusion coefficients for the selected metal species in each experimental solution were measured, and the distribution coefficient for the metal partitioning between phases was determined. At the completion of this work, the INL has determined the mass transfer coefficient and a velocity profile for drops rising by buoyancy through a continuous medium under a specific set of experimental conditions. Additionally, a complete set of experimentally determined fluid properties has been obtained. All data will be provided to LANL to support the modeling effort.