非对称波纹通道内流动与传热的数值计算

摘要

A numerical calculation of steady laminar fluid and heat transfer in periodically corrugated asymmetrical sinusoidal, triangular, elliptical wavy channels was conducted for air in the range of Re=50～1100.The influences of the channel surface shape as well as Reynolds numbers (Re) on the flow and heat transfer performance were researched with uniform wall temperature.The correlations of friction factor (f) and average Nusselt numbers(Nu) with Reynolds numbers were obtained for different wavy channels.Moreover, the performance evaluation factor G was analyzed.It was found that the elliptical wavy channel has a maximal f, and the triangular wavy channel has a minimal f for Re＜500.The maximal Nu was obtained on elliptical wavy plate for Re＞300.The performance evaluation indicates that with Re=900 as a division point, the comprehensive performance of the sinusoidal channel is optimal and that of the elliptical channel is the worst in the range of lesser Re, but for larger Re the elliptical channel has the best performance.%以空气为介质,在雷诺数Re=50～1 100的范围内对非对称的三角形、正弦形和椭圆形波纹通道内稳态层流流动与换热进行数值模拟,分析了恒壁温条件下,Re、波纹板形状对流动与换热特性的影响,并拟合出了各通道内阻力系数f及表面换热特性数Nu随Re变化的关联式,同时对3种波纹通道的综合性能G进行了分析评价.结果表明,椭圆形通道的f最大;Re＜500时三角形通道的f最小;在Re＞300后椭圆形通道表面的Nu值最大;各通道的综合性能,以Re=900为界,在小Re时以正弦形通道性能最佳,椭圆通道的最差,大Re时椭圆通道的性能最佳.