Numerical assessment for robustness of push-pull fume cupboard

A push-pull fume cupboard is a device to capture chemical vapors in a laboratory or a factory. It utilizes a push flow from the bottom of the sash and a pull flow behind the doorsill to form an air curtain and capturepollutants inside the cupboard. The effects ofarms and walk-by on the capture flow in thepush-pull fume cupboard are not clear. Hence,this study is aimed on evaluation of theinfluences of arms and walk-by on the fumecupboard using a numerical model for turbulentflow. In terms of predicted results, thepush-pull fume cupboard is not affected byarms. To avoid the walk-by effect, the ratio ofpush and pull flow speeds has to be adjusted toa specified region.