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首页> 外文会议>International symposium on plasma chemistry >HEAT TRANSFER AROUND A SPHERICAL PARTICLE STABLY LEVITATED IN ARGON PLASMA JET
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HEAT TRANSFER AROUND A SPHERICAL PARTICLE STABLY LEVITATED IN ARGON PLASMA JET

机译：在氩等离子射流中稳定悬浮的球形粒子周围的热传递

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Dynamic and Heat transfer coefficients were determined for stainless steel spherical particles levitated in argon plasma jets. The rapid rotation of the sphere in the plasma a jet ensures the stability of the levitation phenomenon. The stable levitation is indeed achieved with sphere diameter from 6 mm to 8 mm over a wide range of plasma torch parameters (250W< net torch power < 1500 W, 6 1/min < argon flow rate < 10 1/inin and 2.5 mm < nozzle diameter < 4 mm). The steel particle may levitate in the jet up to 50 mm from the nozzle exit and can reach temperatures close to the melting point (? 1750 K). Gas temperature and composition were determined at the flow stagnation point by a pneumatic method and a mass spectrometry technique. The gas velocity was estimated through the use of Crocco's theorem. The particle temperature was further measured either by pyrometry or with a thermopile. We first propose a simple model to describe the momentum transfer from a non uniform plasma flow to a levitating particle. Nusselt numbers were further derived from gas and particle equilibrium temperature at the flow stagnation point or from the analysis of the transient temperature signal for a particle suddenly immersed in the plasma jet. Particle rotation is shown to determine the heat transfer in a non uniform plasma flow.
机译：针对在氩等离子体喷射器中悬浮的不锈钢球形颗粒测定动态和传热系数。球体在等离子体中的快速旋转，射流确保了悬浮现象的稳定性。在各种等离子体炬参数范围内的球体直径为6毫米至8mm的球体直径（250W

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