Abstract
Gas-atomized melt spraying is used for the manufacture of metallic particulate and spray-deposited preforms. The flow behaviour of the gas in the spray is a critical component of the spraying process. Knowledge of the gas flow field generated by the atomizer is a prerequisite for characterizing the transport phenomena controlling droplet dynamics and heat transfer during droplet flight. Flow visualization, Pitot tube measurements and laser Doppler anemometry have been used in the present study to investigate the steady state gas flow field generated by a close-coupled spray deposition gas atomizer for gas flow rates of 2.0 and 2.7 l s −1 and atomizer-to-substrate distances of 180 and 360 mm. Maximum gas velocities of up to 119 m s −1 have been measured along the axis of the conical flow field generated by the atomizer. The variation in axial gas velocity perpendicular to the axis of the flow follows the form of a gaussian distribution. A mathematical model of the flow field generated by the gas atomizer has also been developed, and the predictions of the model are compared with the gas flow measurements.
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