Akademik Veri Yönetim Sistemi
15th International Conference on Computational Heat & Mass Transfer, Antalya, Türkiye, 19 - 22 Mayıs 2025, (Özet Bildiri)
III-V semiconductors are among the most versatile materials for optoelectronic and photonic applications due to their air stability and tunable direct bandgaps, which span a wide range from 0.35 to 6 eV. Gas-phase synthesis offers a promising approach for producing ligand-free III-V nanocrystals, an essential feature for electronic applications. However, most gas-phase methods rely on vapor-phase precursors, which are expensive, highly toxic, and pyrophoric. An alternative involves generating elemental precursors using an evaporation-condensation generator (ECG), commonly implemented as a tubular furnace. Developing an ECG capable of delivering a stable aerosol output with high mass yield is a critical need.
In this study, mathematical modeling and simulations of an ECG were performed by integrating momentum, heat, and mass transport with aerosol dynamics. Antimony, a key component of various III-V compounds, was selected as the test material. Building on experimental results for an ECG operating under reduced pressure, simulations were conducted at 6 Torr across varying gas flow rates using computational fluid dynamics (CFD). Once the transport phenomena were modeled, a detailed lognormal aerosol dynamics model was developed, incorporating terms for advection, surface growth, diffusion, coagulation, and thermophoresis. These terms were integrated into the CFD framework to achieve a comprehensive mathematical representation of aerosol formation. The results, including aerosol mass flow rates and generator yields, demonstrated an order-of-magnitude agreement with experimental data, validating the model's accuracy. Details of the CFD and lognormal model will be presented, along with results and comparison with experimental data.