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您的检索式：作者名="K.P.SREEKUMAR"
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| 1 | Three-Dimensional Numerical Modeling of an Ar-N_2 Plasma Arc Inside a Non-Transferred Torch显示文摘A three-dimensional numerical model is developed to study the behaviour of an argon-nitrogen plasma arc inside a non-transferred torch.In this model,both the entire cathode and anode nozzle are considered to simulate the plasma arc.The argon-nitrogen plasma arc is simulated for different arc currents and gas flow rates of argon.Various combinations of arc core radius and arc length,which correspond to a given torch power,are predicted.A most feasible combination of the same,which corresponds to an actual physical situation of the arc inside the torch,is identified using the thermodynamic principle of minimum entropy production for a particular torch power.The effect of the arc current and gas flow rate on the plasma arc characteristics and torch efficiency is explained.The effect of the nitrogen content in the plasma gas on the torch power and efficiency is clearly detected.Predicted torch efficiencies are comparable to the measured ones and the effect of the arc current and gas flow rate on predicted and measured efficiencies is almost similar.The efficiency of the torch,cathode and anode losses and core temperature and velocity at the nozzle exit are reported for five different cases. | B.SELVAN K.RAMACHANDRAN K.P.SREEKUMAR T.K.THIYAGARAJAN P.V.ANANTHAPADMANABHAN | 2009 | Plasma Science and Technology2009，11，6： | 2 |
| 2 | Effect of Spraying Parameters on Deposition Efficiency and Wear Behavior of Plasma Sprayed Alumina-Titania Composite Coatings显示文摘The effects of parameters,in the process of plasma-sprayed ceramic coating,upon the deposition efficiency of alumina-13 wt.%titania composite coatings are reported.The coatings were prepared by the atmospheric plasma spray process.The plasma torch input power,flow rates of primary,secondary and carrier gas,powder feed rate and spraying distance were considered as variables.The results show that the variations in all the selected spraying parameters strongly affect the deposition efficiency.The micro-hardness,as well as erosive and sliding wear rates of the coating are also affected by these parameters.Especially the input power strongly affects the phase and microstructure of the coatings. | M.VLJAY V.SELVARAJAN S.YUGESWARAN P.V.ANANTHAPADMANABHAN K.P.SREEKUMAR | 2009 | Plasma Science and Technology2009，11，6： | 0 |
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