边界层方程求解传热传质复合自然对流的偏差分析.pdfVIP

　第 54 卷 　第 7 期 　 　化 　　　工 　　　学 　　　报 　　　 　　　　Vol54 　№7 ( ) 　 2003 年 7 月 　 　Journal 　of 　Chemical 　Industry 　and 　Engineering 　 China 　 　July 　2003 研究简报 边界层方程求解传热传质复合 自然对流的偏差分析 黄碧波 　王 　煤 　余 　徽 ( 四川大学化学工程学院 , 四川 成都 610065) 关键词 　边界层方程 　偏差分析 　传热传质 　自然对流 　数值解析 中图分类号 　TQ 0213 　TQ 0214 　　　文献标识码 　A 文章编号 　0438 - 1157 (2003) 07 - 1004 - 05 D EVIATION ANAL YSIS OF BOUNDARY LAYER SOLU TION S FOR COMBIN ED HEAT AND MA S S TRAN SFER B Y NATURAL CONVECTION HUAN G Bibo , WAN G Mei and YU Hui ( College of Chemical Engineering , Sichuan University , Chengdu 610065 , Sichuan , China) Ab stract 　Numerical analyses were made for combined heat and mass transfer by natural convection on a vertical surface Both boundary layer equations and full equations of momentum , energy and mass were solved by using a control volume formulation , and the results were compared in detail for velocity , temperature , concentration , Nusselt and Sherwood number profiles The discrepancies of boundary layer analysis from full equations under different values of buoyancy ratio B were systematically investigated for Pr/ Sc 1 , Pr/ Sc 1 and Pr/ Sc = 1 The value of buoyancy ratio B min predicted by boundary layer equations at the minimum heat and mass transfer rates was consistent with that of full equations solutions The boundary layer analysis did not predict the velocity , temperature and concentration profiles accurately at