A Review of Termo- and Diffusio-Phoresis in the Atmospheric Aerosol Scavenging Process. Part 1: Drop Scavenging

• 作者: Franco Belosi Franco Prodi Gianni Santachiara
• 来源期刊: 大气和气候科学(英文)
• 学科: 医学
• 关键词: THERMOPHORESIS DIFFUSIOPHORESIS IMPACTION
• 年，卷（期）: 2012,（2）
• 页码范围: 148-158
• 页数: 11页
• 分类号: R73

摘要

The role of phoretic forces in providing in-cloud and below-cloud scavenging due to falling drop is reviewed by considering published papers dealing with theoretical models, laboratory and field measurements. Theoretical analyses agree that Brownian diffusion appears to dominate drop scavenging of aerosol with radius less than 0.1 μm, and inertial impaction dominates scavenging of aerosol with radius higher than 1 μm. Thus, there is a minimum collection efficiency for particles in the approximate range 0.1 μm - 1 μm, where phoretic forces are felt. Generally speaking, published papers report not uniform evaluations of the contribution of thermo- and diffusiophoretic forces. This disagreement is partially due to the different laboratory and field conditions, and different theoretical approaches.