摘要
对等热流边界条件下速度场与温度场同时发展的进口段效应,进行了理论研究和实验研究。在理论研究中,基于求解传热问题三大方程组,推导出可借助有限差分法求解的微分—积分方程组,编出了计算机计算程序。根据数值解,得到了一些湍流传热计算关系式。对于速度场与温度场同时发展工况: L_h/D_e=Pe/(1+6.0PrRe^(0.545) Nu(x)=(1.80+0.017Pe^(0.8)((X/D_e)/(L_h/D_e)-ln(X/D_e)/(L_h/D_e))+2.6+0.002Pe^(0.8) 对于速度场充分发展,只温度场正在发展工况: L_h/D_e=Pe/(1+5.9PrRe^(0.554) Nu(x)=(1.83+0.015Pe^(0.8)((X/D_e)/(L_h/D_e)-ln(X/D_e)/(L_h/D_e))2.57+0.004Pe^(0.8) 对于稳定段: Pu(∞)=4.4+0.019Pe^(0.8) 在实验研究中,环形通道实验段内径d_1=12.34mm,外径d_2=19.00mm,通道外壁绝热,内壁施以恒热流。研究表明,数定值与实验结果以及其他作者实验结果吻合良好。研究参数范围:Re=2×10~4～1.35×10~5;Pe=128～854。
In this paper an analytical solution and experimental investigation concerning the problem of turbulent heat transfer in an annuli with simultaneously developing velosity and temperature distribution under the condition of a constant wall heat flux were made.
For the theoretical study, based on the solution of the equations of mass conservation and the Navier-Stokes equations of motion and the energy equation with some assumptions the authors derived several groups of differential and integral equations which were solved, using a finite difference technique with the help of computer codes.
Acoording to the asymptotic solutions the authors obtained the following turbulent heat transfer relations.
For the case of simultaneously developing velosity and temperature distribution:
L_h/D_e:Pe/(1+6.0PrRe^(0.545)
Nu(x)=(1.80+0.017 Pe^(0.8))(?)+ 2.6+0.002Pe^(0.8)
For the case of fully-developed only velosity and developing temperature distribution:
L_h/D_e:Pe/(1+5.9PrRe^(0.545)
Nu(x)=(1.83+0.015 Pe^(0.8))(?)+2.57+0.004Pe^(0.8)
For the case of fully-developed both velosity and temperature distribution:
Nu(∞)=4.4+0.019Pe^(0.8)
It was found that the asymptotic solutions conformed very well with the experimental data obtained by the authors and others.
出处
《核科学与工程》
CAS
CSCD
北大核心
1992年第4期310-324,3,共15页
Nuclear Science and Engineering
