Investigation of Droplet Penetrations through Complex Openings of Compartments

摘要

The present research presents an integrated approach to model the penetration of211u001ewater mist through the obstructions for fire suppression applications. Firstly, 211u001enumerical investigations employing the two-phase Navier-Stokes equations are 211u001eachieved using computatonal fluid dynamics (CFD) to evaluate the overall 211u001etransport of droplets in the vicinity of the openings, which include rectangular 211u001estrips and 3-D screen object. In particular, the motions of the droplets coupled 211u001ewith the gas flow field around the objects are analyzed. The deposition of 211u001edroplets on the objects and their penetration through the spacing of the objects 211u001eare also formulated. Then, experimental investigations are performed to address 211u001ethe actual impacting phenomena of droplets on objects. Droplet generators are 211u001edesigned to generate droplets in a variety of operating conditions. Structures 211u001esuch as cylindrical wires and mesh screens are examined in the impaction 211u001eexperiments. Images of the impacting phenomena are analyzed through digital image 211u001eprocessing. Non-dimensional regime maps and the correlations of the impaction 211u001eoutcome are also developed. The conclusions from both the numerical and 211u001eexperimental investigations are integrated to provide an overall understanding to 211u001ethe complex interaction phenomena and to establish a procedure for predicting the 211u001eoutcome of similar processes.