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用改进的离散坐标法计算炉内三维辐射传热 被引量:4
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作者 魏小林 徐通模 惠世恩 《燃烧科学与技术》 CAS CSCD 2000年第2期140-145,共6页
采用离散坐标法进行炉内三维辐射传热的计算 ,首先在正方体炉膛内验证了该法的精确性 ,计算结果与区域法进行比较 ,表明离散坐标法算法可靠 ,计算工作量小 ,适合于炉内辐射传热的计算。然后针对长方体炉膛计算了吸收 -发射 -散射介质的... 采用离散坐标法进行炉内三维辐射传热的计算 ,首先在正方体炉膛内验证了该法的精确性 ,计算结果与区域法进行比较 ,表明离散坐标法算法可靠 ,计算工作量小 ,适合于炉内辐射传热的计算。然后针对长方体炉膛计算了吸收 -发射 -散射介质的传热问题 ,表明传统的离散坐标法不适合计算具有复杂相函数曲线的辐射传热问题 ,因此采用改进的离散坐标法 ,并得到了合理的结果。最后 ,对于煤粉燃烧炉膛将辐射传热问题和炉内流动、燃烧过程耦合起来进行计算 。 展开更多
关键词 离散坐标法 煤粉锅炉 三维辐射传热 炉内
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MHD three dimensional flow of viscoelastic fluid with thermal radiation and variable thermal conductivity
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作者 SHEHZAD S A HAYAT T ALSAEDI A 《Journal of Central South University》 SCIE EI CAS 2014年第10期3911-3917,共7页
The objective of the present work is to model the magnetohydrodynamic(MHD) three dimensional flow of viscoelastic fluid passing a stretching surface. Heat transfer analysis is carried out in the presence of variable t... The objective of the present work is to model the magnetohydrodynamic(MHD) three dimensional flow of viscoelastic fluid passing a stretching surface. Heat transfer analysis is carried out in the presence of variable thermal conductivity and thermal radiation. Arising nonlinear analysis for velocity and temperature is computed. Discussion to importantly involved parameters through plots is presented. Comparison between present and previous limiting solutions is shown. Numerical values of local Nusselt number are computed and analyzed. It can be observed that the effects of viscoelastic parameter and Hartman number on the temperature profile are similar in a qualitative way. The variations in temperature are more pronounced for viscoelastic parameter K in comparison to the Hartman number M. The parameters N and ε give rise to the temperature. It is interesting to note that values of local Nusselt number are smaller for the larger values of ε. 展开更多
关键词 three dimensional flow viscoelastic fluid variable thermal conductivity thermal radiation
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