Aerosol deposition from laminar flow in a horizontal circular tube is studied analytically considering the combined mechanisms of Brownian diffusion and gravitational settling, and the mean concentration and deposition velocity are calculated and analyzed by using the theoretical solution. The results show that when both diffusional and gravitational effects are considered, the deposition velocity varies non-monotonically with respect to transport distance in the tube. This is different from that of deposition by diffusion alone. For the case when the gravitational effect is negligible, aerosol convective transport in tubes is compared with existing results, and the analysis indicates that the results in the literature dealing with this aspect can be determined by simplifying the present solution under specific conditions. The comparisons of mean concentration due to pure diffusion and combined mechanisms between the previous studies and the present results also indicate that the explicit general solution of this study can be used to describe aerosol deposition at any distance in a horizontal circular tube.

考虑布朗扩散和重力沉降的综合机理，对层流在水平圆管中的气溶胶沉积进行了分析研究，并利用理论解计算和分析了平均浓度和沉积速度。结果表明，当同时考虑扩散和重力作用时，沉积速度相对于管中的传输距离非单调变化。这与仅通过扩散进行的沉积不同。对于重力影响可忽略不计的情况，将管中的气溶胶对流传输与现有结果进行比较，分析表明，可以通过在特定条件下简化本解决方案来确定有关此方面的文献中的结果。