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首页> 外文期刊>International Journal of Heat and Mass Transfer >A numerical study of turbulent flow and conjugate heat transfer in concentric annuli with moving inner rod
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A numerical study of turbulent flow and conjugate heat transfer in concentric annuli with moving inner rod

机译：内杆移动同心环流中湍流和共轭传热的数值研究

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摘要

A numerical study is conducted to investigate turbulent flow and conjugate heat transfer in a concentric annul us with a heated inner cylinder moving in the streamwise direction. A modified two-equation k-ε model with low Reynolds number treatment near wall is employed to model the Reynolds stress and turbulent thermal field which are based on Boussinesq's approximation. The governing equations are numerically resolved by means of a hybrid finite analysis method. A uniform inlet flow and thermal conditions are specified to consider the effects of entrance of both solid and fluid regions. For a constant Prandtl number of 6.99 of water flow, calculating results of the time-averaged streamwise velocity, turbulent viscosity and temperature field are obtained for the Reynolds numbers from 1.0 x 10~4 to 5.0 x 10~5, rod velocity ratio between 0 and 1.0, and the radius ratio ranging from 0.286 to 0.750. The parametric studies show that the bigger rod speed ratio or the radius ratio is, the temperature is higher within solid rod. For a certain absolute rod speed, temperature profile diminishes at both sides of solid rod and fluid as Reynolds number grows. Numerical results also show that compared with the case of β = 0 where solid rod is stationary, for large rod speed ratio the averaged axial velocity and turbulent viscosity profiles have substantial deformations, that is, the gradient of averaged axial velocity and turbulent viscosity near rod surface greatly reduced by the axial movement of solid rod.
机译：进行了数值研究，以研究同心环流中的湍流和共轭传热，其中加热的内缸沿流向运动。采用修正的两方程k-ε模型，在壁附近进行低雷诺数处理，以基于布西涅斯近似为基础对雷诺应力和湍流热场进行建模。控制方程通过混合有限分析方法进行数值求解。指定了均匀的入口流量和热条件，以考虑固体和流体区域进入的影响。对于恒定的Prandtl数为6.99的水流，获得雷诺数从1.0 x 10〜4到5.0 x 10〜5，杆速比为0的时间平均流向速度，湍流粘度和温度场的计算结果。和1.0，半径比范围为0.286至0.750。参数研究表明，杆速比或半径比越大，实心杆内温度越高。对于一定的绝对杆速度，随着雷诺数的增加，实心杆和流体两侧的温度分布都会减小。数值结果还表明，与β= 0的情况相比，实心杆是固定的，对于大的杆速比，平均轴向速度和湍流粘度分布具有较大的变形，即杆附近的平均轴向速度和湍流粘度的梯度实心杆的轴向运动大大减少了表面。

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