Experimental study on heat transfer enhancement characteristics of tube with cross hollow twisted tape inserts

被引：113

作者：

He, Yan ^{[1
]}

Liu, Li ^{[1
]}

Li, Pengxiao ^{[2
]}

Ma, Lianxiang ^{[1
]}

机构：

[1] Qingdao Univ Sci & Technol, Sch Mech Engn, Qingdao, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2018年 / 131卷

关键词：

Cross hollow twisted tape inserts; Hollow width; Turbulent flow; Heat transfer enhancement; FRICTION FACTOR CHARACTERISTICS; HELICAL SCREW-TAPE; PHYSICAL QUANTITY SYNERGY; LAMINAR-FLOW FIELD; CIRCULAR TUBE; TURBULENT-FLOW; PERFORMANCE ASSESSMENT; TRANSFER OPTIMIZATION; EXCHANGER TUBE; PRESSURE-DROP;

D O I：

10.1016/j.applthermaleng.2017.12.029

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This study experimentally investigates the heat transfer and friction factor (f) characteristics of a tube fitted with cross hollow twisted tape inserts of hollow widths of 6, 8 and 10 mm under uniform heat flux. Experimental data of a plain tube are compared to the standard correlations for validation. Results show that the Nusselt number (Nu) and f decrease and then increase as the hollow width increases from 6 mm to 10 mm. Nu and f for the 6 mm hollow width increase by 93%-120% and 883%-1042%, respectively, in comparison with those of the plain tube. The performance evaluation criterion (PEC) varies from 0.87 to 0.98 under a Reynolds number of 5600-18,000. Correlations based on the experimental data are established to predict Nu and f under turbulent flow. These parameters match the experimental data well within 3.6% (Nu) and 2.3% (f). (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：743 / 749

页数：7

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