Modeling of Ceramic Particle Heating and Melting in a Microwave Plasma

IF 1.9 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2011-03-01 DOI:10.1115/1.4002448

K. Saha, Swetaprovo Chaudhuri, B. Cetegen

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引用次数: 6

Abstract

A comprehensive model based on finite volume method was developed to analyze the heat-up and the melting of ceramic particles injected into a microwave excited laminar air plasma flow field. Plasma flow field was simulated as a hot gas flow generated by volumetric heat addition in the microwave coupling region, resulting in a temperature of 6000 K. Alumina and zirconia particles of different diameters were injected into the axisymmetric laminar plasma flow at different injection velocities and locations. Additionally, noncontinuum effects, variation of transport properties of plasma surrounding the spherical particles and absorption of microwave radiation in the ceramic particles were considered in the model. Model predictions suggest that zirconia and alumina particles with diameters less than 50 μm can be effectively melted in a microwave plasma and can produce more uniform melt states. Microwave plasma environment with the ability to inject particles into the plasma core provide the opportunity to create more uniform melt states as compared with dc arc plasmas that are influenced by characteristic arc root fluctuations and turbulent dispersions.

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微波等离子体中陶瓷颗粒加热和熔化的模拟

建立了一个基于有限体积法的综合模型，分析了微波激发层流空气等离子体流场中陶瓷颗粒的升温和熔化过程。将等离子体流场模拟为在微波耦合区通过体积加热产生的热气流，其温度为6000 K。将不同直径的氧化铝和氧化锆颗粒以不同的注入速度和位置注入到轴对称层流等离子体流中。此外，该模型还考虑了非连续介质效应、围绕球形粒子的等离子体输运性质的变化以及陶瓷粒子对微波辐射的吸收。模型预测表明，直径小于50 μm的氧化锆和氧化铝颗粒可以在微波等离子体中有效熔化，并且可以产生更均匀的熔体状态。与受特征电弧根波动和湍流色散影响的直流电弧等离子体相比，能够将粒子注入等离子体核心的微波等离子体环境提供了创造更均匀熔体状态的机会。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.