Characteristics of particle coagulation in an underground parking lot

摘要: Particles in vehicle exhaust plumes underground parking lots have adverse health effects due to the enclosed environment which they are released and temperature difference between tailpipe ambient environment; at same time, particle coagulation might be obvious near an lot. In present study, airflow fields were calculated using Realizable k-e model, Eulerian transport model was selected numerical simulation of concentration dispersion. Polydisperse thermal Brownian collisions employed calculate coagulation. The results show that rate half-time significant within 1 m from tailpipe. variations similar, but their directions opposite. Air time nearly four times longer than averaged 40 minimum half-time. peak diameter increased approximately 1.43 A double caused fourfold rise distance ranging less An increase velocity could shorten range along centerline 0.8 study.