摘要
用数值方法研究了倾斜板上热及物质扩散共存且扩散方向相反时的流体流动及传热传质,得到了速度、流线、温度和浓度分布以及传热传质速率随倾斜角度和浮力比的变化规律。研究结果表明:流体速度、努塞尔数Nu和修伍德数Sh均随倾斜角度的增加而增大,当θ>60°时,倾斜角度的变化对传热传质的影响减小,Nu和Sh数的变化趋于平缓。倾斜角度相同时,Nu和Sh随浮力比|B|的增大而增大。
Effects of the inclination angle and the ratio of buoyancies due to heat diffusion and mass diffusion on fluid flow and heat and mass transfer characteristics have been investigated for Pr=0.7 and Sc=5.0.Numerical results are obtained for velocity,temperature and concentration profiles, variations of both Nusselt and Sherwood numbers under different buoyancy ratio and inclination angles of θ=15°～90°.For B≤-2,the large opposing buoyancy causes the fluid near the wall to flow downwards.The axial velocity, Nusselt and Sherwood numbers increase with the increasing inclination angle. However, the effect of inclination angle on heat and mass transfer becomes weak at θ>60°.The Nusselt and Sherwood numbers increase with the increasing buoyancy ratio of |B| at a given inclination angle.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
2003年第2期52-55,共4页
Journal of Sichuan University (Engineering Science Edition)
