管内纵向涡强化换热的阻力特性

为探讨管内纵向涡强化换热的阻力特性，通过理论分析和实验研究，分析了管内雷诺数以及涡发生器的安放位置、间距、高度等参数对管内阻力的影响，得到了管内阻力的拟合公式，并列出图表进行比较分析，进而得到了管内纵向涡发生器强化传热的规律和阻力特性，结果表明：在同一雷诺数下，阻力系数随间距的变化呈一次线性关系；间距相同时，较高的发生器高度对雷诺数较大时的传热有更显著的强化效果；小于纵向涡影响区域的间距设置对于强化换热是不可取的。

Flow Resistance Characteristics in Heat Exchange Tubes Enhanced with LVGs

In order to study the flow resistance characteristics in the heat exchange tubes enhanced with longitudinal vortex generators (LVGs), the influences of various parameters, such as the Reynolds number inside the tubes, the installation position as well as the height of LVGs and the distance between LVGs, flow resistance were investigated by theoretical analysis and experimental studies. Fitting formulas of the flow resistance were then deduced. Moreover, a graphical comparison was carried out, thus obtaining the corresponding action rules and pressure drop cha- racteristicsof the heat exchange. The results show that: (1) the flow resistance coefficient is linear with the distance between LVGs under the same Reynolds number; (2) with the same distance between LVGs, the heat ex-change will be greatly enhanced by the height of LVGs in the case of larger Reynolds number; and (3) a distance between LVGs which is less than the affecting distance of LVGs is not desirable for the heat exchange enhancement.