Method for studying the effect of the gas injection from the surface of a solid sphere on the drag coefficient
V.A. Arkhipov, S.A. Basalaev, V.D. Gol’din, K.G. Perfil’eva, A.S. Usanina
Nauchno-Issledovatel'skiy Institut Prikladnoy Matematiki I Mekhaniki Tgu, Tomsk, Russia
Keywords: solid sphere, gas injection, drag coefficient, Reynolds number, transitional flow regime, self-similar flow regime, experimental study
Abstract
Method for studying the effect of the mass flow from the particle surface on the drag coefficient in a wide range of Reynolds numbers is suggested. For this, two experimental setups have been developed and used for the study of the effect of air injection from the surface of a solid perforated sphere on the drag coefficient at various values of the velocity of injection flow in the range of Reynolds numbers of the airflow around a particle from 133 to 9900. It is shown that the drag coefficient of the particle decreases with an increase in the velocity of the gas injected from the surface of a solid spherical particle. The empirical equation for calculating the drag coefficient of a solid sphere in the self-similar regime depending on the ratio of the gas injection velocity and the airflow velocity has been derived from the regression analysis.
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