几何结构对圆内开缝圆自然对流的影响

Natural convection in cylinder with internal slotted annulus under different structures

采用SIMPLE算法,对不同几何结构圆内开缝圆自然对流换热进行数值模拟,研究了开缝度、半径比改变对流动换热的影响。结果表明,在相同条件下计算数值结果与已有的实验结果吻合良好;把内圆开缝可以强化换热,但并非开缝度越大换热越好;半径比对换热效果产生影响,表现为半径比越小,环形空间越窄,换热效果越差。随着半径比的增大,Keq显著增加,当半径比超过2.0时,Keq基本保持不变。

SIMPLE algorithm was used to simulate natural convection in a cylinder with an internal slotted annulus under different slotted structures,the influence on the heat transfer and fluid flow was studied when changing slotted degree and radius ratio.The results showed that under the same conditions calculated numerical results were in good agreement with the existing experimental results.The slot can enhance the heat transfer,but not slotted degree the greater the better.Radius ratio influenced on the heat transfer,showing that the radius ratio was smaller,the annular space more narrow,so the heat transfer effect was worse.With the increase of the radius ratio,the Keqincreased obviously,but when the radius ratio exceeded 2,the K_(eq) remained the same.