Abstract
3D finned tube is a highly efficient heat transfer enhanced element, and its manufacturing has always been the focus of research’s attention. It is a challenging job to manufacture a 3D finned tube that can enhance both boiling and condensation since the enhanced boiling structure is completely different from the enhanced condensation structure due to their different heat transfer enhancement mechanisms. An innovative rolling-cutting-extruding composite forming method is developed to realize the manufacture of a staggered-stepped lattice finned tube (SLFT) with helical fins, two layers of staggered-stepped lattice fins, and inner helical threads, which can enhance boiling as well as condensation heat transfer. The three specially designed skewed rolling-cutting tools are uniformly distributed around the base tube, and the kinematic of rolling-cutting-extruding process is analyzed. The relative plunge depth of a rolling blade cannot exceed a certain limit value, and the feeding angle has to be equal to the helix angle of outer helical fin. According to the kinematic analysis, the parameters of the rolling-cutting tool are selected, and processing experiments of the SLFT are conducted.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Abbreviations
- p :
-
Pitch of helical fin (mm)
- h :
-
Height of helical fin (mm)
- w :
-
Lower stepped fin width (mm)
- ω 1 :
-
Angular speed of rolling cutter (rad/min)
- D :
-
Diameter of a rolling blade (mm)
- d :
-
Diameter of tube (mm)
- Z :
-
Plunge depth of a rolling blade (mm)
- t :
-
Thickness of a rolling blade (mm)
- N :
-
Number of teeth of rolling cutter
- a :
-
Arm of tangential force (mm)
- V x :
-
Axial speed of a point on a rolling blade
- R :
-
Radius of a rolling blade (mm)
- Δh :
-
Height difference of two stepped fins (mm)
- h t :
-
Tooth height of the tooth cutter
- ΔH :
-
Height difference in radius of tooth and flat cutter (mm)
- δ :
-
The included angle between the two side edges of a tooth
- θ :
-
Helix angle (°)
- α :
-
Feeding angle (°)
- μ :
-
Friction coefficient
- ω 2 :
-
Angular speed of tube (rad/min)
- D t :
-
Diameter of a tooth cutter (mm)
- P :
-
Rolling force (N)
- F :
-
Tangential friction force (N)
- t s :
-
Thickness of shim
- φ :
-
Center angle (°)
- b :
-
Arm of rolling force (mm)
- V t :
-
Axial speed of tube
- r :
-
External radius of the tube
- n :
-
Rolling speed (r/min)
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Funding
This work is sponsored by the Key Research and Development Project of Guangdong Province (2020B090926004) and Science and Technology Planning Project of Guangdong Province, China (2015B020238004).
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Xiaofang Huang performed the data analyses and wrote the manuscript; Hanping Chen performed the experiment; Zhenping Wan contributed significantly to analysis and manuscript preparation; Longsheng Lu and Hongguan Zhu helped perform the analysis with constructive discussions; and Yong Tang contributed to the conception of the study.
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Huang, X., Chen, H., Wan, Z. et al. Manufacturing of a 3D finned tube for enhanced boiling and condensation using rolling-cutting-extruding composite forming. Int J Adv Manuf Technol 117, 1859–1869 (2021). https://doi.org/10.1007/s00170-021-07801-0
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DOI: https://doi.org/10.1007/s00170-021-07801-0