Flynn M R, Gatano B L, McKernan J L, Dunn K H, Blazicko B A, Carlton G N
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill 27599-7400, USA.
Ann Occup Hyg. 1999 Jan;43(1):67-76.
This paper presents a mathematical model to predict breathing-zone concentrations of airborne contaminants generated during compressed air spray painting in cross-flow ventilated booths. The model focuses on characterizing the generation and transport of overspray mist. It extends previous work on conventional spray guns to include exposures generated by HVLP guns. Dimensional analysis and scale model wind-tunnel studies are employed using non-volatile oils, instead of paint, to produce empirical equations for estimating exposure to total mass. Results indicate that a dimensionless breathing zone concentration is a nonlinear function of the ratio of momentum flux of air from the spray gun to the momentum flux of air passing through the projected area of the worker's body. The orientation of the spraying operation within the booth is also very significant. The exposure model requires an estimate of the contaminant generation rate, which is approximated by a simple impactor model. The results represent an initial step in the construction of more realistic models capable of predicting exposure as a mathematical function of the governing parameters.
本文提出了一个数学模型，用于预测在横流通风喷漆室内进行压缩空气喷漆时呼吸带空气中污染物的浓度。该模型着重于表征过喷漆雾的产生和传输。它将先前关于传统喷枪的研究扩展到包括高流量低压力（HVLP）喷枪产生的暴露情况。使用非挥发性油而非油漆进行量纲分析和比例模型风洞研究，以生成用于估算总质量暴露的经验方程。结果表明，无量纲呼吸带浓度是喷枪空气动量通量与穿过工人身体投影面积的空气动量通量之比的非线性函数。喷漆操作在喷漆室内的方向也非常重要。暴露模型需要对污染物产生速率进行估算，这可通过一个简单的撞击器模型来近似。这些结果代表了构建更现实模型的初步步骤，该模型能够将暴露预测为控制参数的数学函数。
