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以松花江水为工质,采用对比的实验方法对不连续双斜向内肋管与光管的传热和污垢特性进行研究,并用数值方法模拟不连续双斜向内肋管内流场和壁面剪切力。结果表明:随着流速的增加,不连续双斜向内肋管Nu数的增长趋势开始变缓;不连续双斜向内肋管在3种流速下都出现结垢诱导期,流速高时诱导期会相对更长,说明其内肋对管型结构会延长结垢时间;管内流速约达到0.5m/s后,提高流速对污垢热阻的影响已不明显,且与不连续双斜向内肋管传热特性的变化趋势相关;由于不连续双斜向内肋管的内部流场和剪切力的周期性变化,不连续双斜向内肋管的换热和抗垢性能均优于光管。
Taking Songhua River water as the working fluid, the heat transfer and fouling characteristics of discontinuous double-beveled inner-finned tubes and light pipes were studied by the comparative experiment method. The numerical simulation was used to simulate the flow field and wall in discontinuous double-beveled inner-finned tubes Shear force. The results show that with the increase of flow rate, the growth trend of discontinuity of double-dorsal ribbed internal rib starts to slow down. In discontinuous double-tapered internal ribbed tubes, the inducing of fouling occurs at all three kinds of flow rate, Period will be relatively longer, indicating that the inner rib on the tubular structure will extend the fouling time; tube flow rate of about 0.5m / s, increasing the flow rate on the fouling thermal resistance is not obvious, and with the discontinuous double diagonal Due to the periodic changes of the internal flow field and shear force of the discontinuous double-beveled inner-finned tubes, the heat transfer and anti-fouling properties of the discontinuous double-beveled inner-finned tubes are superior to Light pipe.