The article aims to study experimentally the enhanced thermal-hydraulic performance in a constant heat-fluxed tube inserted with V-winglet-attached twin counter-twisted tapes. Air was utilized as the test fluid and flowed into the tube in a turbulent flow region, Reynolds number in a range of 5300 to 24,000. In the current study, the twin counter-twisted tape (CTT) device having an identical twist ratio were incorporated with 30° V-shaped rectangular winglets (VW) mounted on the tape edges, (hereafter called “VW-CTT”). There were several winglet parameters included a single relative pitch, P_R, a 30° winglet attack angle (α) and four values of the winglet height ratio (B_R = b/D). Effects of the winglet parameters on friction loss and thermal characteristics in the form of Nusselt number (Nu) and friction factor (f) including thermo-hydraulic performance were examined. The measured results have been revealed that the VW-CTT can augment considerably f and Nu above the smooth tube alone. Using VW-CTT, the increase in Nu is about 1.56–2.3 times the plain tube whilst that in f is around 2.63–5.76 times, depending on Re and B_R. The VW-CTT with B_R = 0.09 has the optimal thermal performance at about 1.76 for the same pumping power. Finally, Nu and f correlations for the measured data were determined and had the maximum deviations by ±8.4% each.

该文章旨在通过实验研究在插入有V型小翼的双反扭曲带的恒定热流管中增强的热工液压性能。将空气用作测试流体，并在湍流区域（雷诺数在5300至24,000的范围内）中流入管中。在当前的研究中，将具有相同扭曲比的双反扭曲带（CTT）设备与安装在带边缘上的30°V形矩形小翼（VW）结合在一起（以下称为“ VW-CTT”）。有几个小翼参数，包括单个相对螺距P _R，30°小翼迎角（α）和四个小翼高度比值（B _R  =  b / D）。检验了小翼参数对摩擦损失和热特性的影响，其形式为Nusselt数（Nu）和摩擦系数（f），包括热工液压性能。测量结果表明，VW-CTT仅在光滑管上方就能显着增加f和Nu。使用VW-CTT，取决于Re和B _R，Nu的增加约为普通管的1.56-2.3倍，而f的约为2.63-5.76倍。 对于相同的泵浦功率，B _R = 0.09的VW-CTT具有最佳的热性能，约为1.76。最后，Nu和f 确定测量数据的相关性，每个相关性的最大偏差为±8.4％。