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仪器网/ 行业应用/ 解决方案/ (Lisbon Symposia会议论文)喷雾/壁面交互作用数据的评估

(Lisbon Symposia会议论文)喷雾/壁面交互作用数据的评估

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The impingement of sprays onto walls and liquid films occurs in many engineering applications There is a great interest in reliable predictions of the outcome of spray/wall interaction. Numerical
simulations of this phenomenon are based on impingements models, which have their origins in experimental investigations of the process. They are aimed at accurately describing important parameters such as deposition rate of the liquid on the wall or characteristics of the splashed fraction velocity, size and flux of the drops in the secondary spray. Of all existing measurement techniques, the phase Doppler technique is probably the most suitable one to acquire the necessary data with sufficient accuracy and resolution. When applying the phase Doppler technique to characterize spray/wall impingement, the measurement volume is usually placed immediately above the wall surface. The in-going droplets are then distinguished from outgoing droplets through the sign of the velocity component normal to the wall. The wall reference area of the detected drops can be determined analysing the drop trajectories. If the tangential velocity of the drops is significant or if the wall surface is curved, the total wall reference area of the detected drops can be rather large. Since the spray is not uniform, the distribution of the detected drops is partially determined by their distribution over the wall reference area. In such situation the analysis of spray impact requires additional efforts, which are described in this paper. In this study an appropriate evaluation procedure is introduced and
described in detail. 丹迪粒子动态分析仪 PDA
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