会议专题

Experimental Set-up to Measure Particle Deposition from Turbulent Flow in Large Ventilation Ducts: Application to Food Industries

This study is a part of the French project CleanAirNet, which proposes to characterize particle deposition (bioaerosols) in large ventilation ducts, in order to develop appropriated cleaning recommendations for food industries. A small body of experimental literature has been reported on large ventilation ducts1. The purpose of this paper was to investigate particle deposition experiments in large circular ducts at high Reynolds number flow. An experimental bench was designed in a laboratory to validate a theoretically based model predicting particle deposition velocities for fully developed turbulent flow2. The experimental bench included a ventilation system, a monodisperse fluorescent aerosol generation system (VOAG), and direct-reading instruments to monitor the following parameters in real time: air-velocity, temperature, relative humidity, particle aerodynamic diameter (APS). The deposition of particles mass to different surface orientations (with respect to gravity) was calculated after removing the material deposited on the inside surface of the duct, and subsequently measuring the concentration of fluorescein by spectrofluorometry (FluoroMax, HORIBA). The particle mass deposited on filter was also determined by fluorescent techniques. Experiments conducted at 5 m/s (Reynolds number of 5 x 104) in the circular duct system (160 cm in diameter), showed great stability for the generation of particles with nominal size of 1, 4 and 6 μm; with trials lasted for 5, 3 and 1 hour respectively. The fluorescent technique allowed measuring deposited mass particle down to 4x10-11 kg. The experimental approach proposed in this study can be used to validate models on particle deposition in ventilation ducts from food factories, by considering large circular sections, turbulent flows, and thermal gradients for thermophoresis. The CleanAirNet project “Hygienic design of ventilation duct networks in food factories is supported by the ANR (Agence Nationale de la Recherche).

Bio-aerosol Particle deposition Ventilation ducts Turbulent flow Food-industries Particle size distribution Indoor air quality

Guillaume Da Evelyne Géhin Mourad Ben-Othmane Michel Havet Camille Solliec

CERTES,Université Paris Est,61 avenue du Général de Gaulle,94010 Créteil,France GEPEA,ONIRIS,rue de la géraudière,44322 Nantes,France UMR GEPEA,Ecole des Mines de Nantes,4 rue A. Kastler,44300 Nantes,France

国际会议

第七届亚洲气溶胶会议

西安

英文

628-634

2011-08-17(万方平台首次上网日期,不代表论文的发表时间)