Abstract In this study, wire-on-tube condensers used frequently in industrial cooling applications have been investigated experimentally and numerically, which are exposed to forced convection. Five different coils with different geometric properties were studied in the experimental study. The numerical study has been validated by the experimental data obtained through these coils. After validation, the effect of wire diameter (Dw), tube diameter (Dt), wire pitch (Sw) and tube pitch (St) have been investigated parametrically for five different air velocities (0.5, 1.0, 1.5, 2.0 and 2.5 m/s). The parametric study was performed for the variation for wire diameter (1.2 mm–2.0 mm), tube diameter (4.2 mm–7.2 mm), wire pitch (5.5 mm–9.5 mm) and the tube pitch (20 mm–50 mm) to determine their effects on wire-on-tube condensers in terms of heat transfer. It is observed that the increase of the wire diameter decreased the heat transfer coefficient on the wire by 10–12% while the heat transfer coefficient on the tube increased by 10–15%. It is determined that the effect of increasing tube diameters on the convection coefficient on the wire is very low. When the distance between the wires is increased from 5.5 mm to 9.5 mm, the average convection coefficient on both tubes and wires is decreased by 5%. When the distance between the tubes is increased from 20 mm to 50 mm, it is concluded that there is a decrease in the convection heat transfer coefficient on both the tube and the wires by approximately 7–8% depending on the velocities. As a result, the correlations are proposed to determine the amount of heat transfer generated over both the wire and the tube. The proposed correlations yield accurate results in the error range of 10% with CFD results and %15 with experimental results.

中文翻译：

---

线管式冷凝器空气侧强制对流的实验与数值研究

摘要 在这项研究中，对工业冷却应用中经常使用的管式管式冷凝器进行了实验和数值研究，这些冷凝器暴露在强制对流中。在实验研究中研究了具有不同几何特性的五种不同线圈。通过这些线圈获得的实验数据验证了数值研究。验证后，已对五种不同的空气速度（0.5、1.0、1.5、2.0 和 2.5 m/m/2）的线径 (Dw)、管径 (Dt)、线距 (Sw) 和管距 (St) 的影响进行了参数研究。 s)。对线径 (1.2 mm–2.0 mm)、管径 (4.2 mm–7.2 mm)、线距 (5.5 mm–9.5 mm) 和管距 (20 mm–50 mm) 的变化进行了参数研究确定它们在传热方面对管式冷凝器的影响。据观察，线径的增加使线材上的传热系数降低了 10-12%，而管子上的传热系数增加了 10-15%。确定增加管径对线材上的对流系数的影响非常低。当导线之间的距离从 5.5 mm 增加到 9.5 mm 时，管和导线的平均对流系数降低 5%。当管子之间的距离从 20 mm 增加到 50 mm 时，可以得出结论，管子和导线上的对流传热系数降低了大约 7-8%，具体取决于速度。因此，提出了相关性来确定在金属丝和管上产生的热量传递量。