Homogeneous Nucleation Investigation

这项研究将发展一种高压扩散云 用于测量适度成核速率的室 过饱和 该室将被设计为在 压力高达10，000 K Pa，温度高达600 K 极大地扩展了迄今为止可用的范围。 因此 对于某些物质，成核动力学将是可测量的 接近临界点。 操作原理将是 扩展到考虑非理想性、蒸汽消耗和 潜热释放 将测量成核动力学， 乙醇和壬烷作为温度和压力的函数。 成核是环境中的一种重要现象， 工程应用 动力学是非常 对温度、过饱和度和材料敏感 特性. 预期的数据应有助于选择 改进成核理论。

This research will develop a high pressure diffusion cloud chamber for measurement of nucleation rates at modest supersaturation. The chamber will be designed to operate at pressures up to 10,000 K Pa and temperatures up to 600 K greatly expanding the range heretofore available. Thus nucleation kinetics will be measurable for some substances near their critical points. The theory of operation will be expanded to account for non-idealities, vapor depletion, and latent heat release. Nucleation kinetics will be measured for ethanol and nonane as functions of temperature and pressure. Nucleation is an important phenomena in the environment and in engineering applications. The kinetics are extremely sensitive to temperature, supersaturation, and material properties. The expected data should help in the selection of improved theories for nucleation.