交叉缩放椭圆管CaCO_3污垢特性的实验研究

Experimental Investigation on the CaCO_3 Fouling Characteristics of the Alternating Elliptical Axis Tube

采用对比实验的方法对交叉缩放椭圆管与铜光管的传热和CaCO_3污垢特性进行了研究,并用数值方法模拟了交叉缩放椭圆管的内部流场和壁面剪切力。实验结果表明:交叉缩放椭圆管的换热和抗垢性能均优于在对应状态下的铜光管,这主要是由于交叉缩放椭圆管的内部流场和壁面剪切力的周期性变化所引起的。交叉缩放椭圆管在低流速时污垢热阻渐近值较大,当流速增大到一定程度后,再提高流速对污垢热阻渐近值的影响不明显。

The characteristics of heat transfer and CaCO3 fouling were studied by the method of comparative experiments for the alternating elliptical axis tube and the copper tube in this paper, the flow field and wall shear stress in the alternating elliptical axis tube were numerically simulated and analyzed. The results show that the alternating elliptical axis tube has better heat transfer performance and anti-fouling ability than its corresponding copper tube, the periodic change of flow field and wall shear stress in the alternating elliptical axis tube may be the primary reason. In addition, the alternating elliptical axis tube has greater asymptotic value of fouling resistance at low speed. While the flow velocity increased to a certain value, there is not obvious effect on the asymptotic value of fouling resistance.