Numerical investigation on plastic forming for heat transfer tube consisting of both dimples and protrusions

Zheng, Liancun; Xie, Shuai; Zhang, Jie; Zhang, Liang; Wang, Yulin; Ding, Hu

doi:10.1007/s00170-018-3057-8

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Γ= 𝑢 4 𝑢 5 ;;;;; The realizable k-𝜀 turbulence model was adopted in this study which have been validated in our previous works (Liang et al 2019;Xie et al 2018a).…”

Section: Equation For Turbulence Kinetic Energy K Equation Andmentioning

confidence: 99%

“…They reported that the protrusion volume significantly affects thermal-hydraulic performance. Liang et al (2019) and Xie et al (2018a) performed the extrusion of a conventional smooth tube to create ETDP-enhanced tubes with dimples and protrusions. As a result of superior flow mixing, interrupted boundary layers, periodic jet flows, and swirl flows created by dimples and protrusions, they found that the ETDP outperformed the smooth tube in terms of increased heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Characteristics of Water Flow Into a Dimpled Tube Heat Exchanger: A Parametric Study

Ali¹,

Shehab²

2022

Front. Heat Mass Transf.

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In this study, the hydrothermal water flow characteristics using a dimpled inner tube heat exchanger are investigated experimentally and numerically.A numerical analysis has performed on two types of dimpled tubes (In-lined and staggered distributions) for two distribution angles 60 o and 90 o , and two dimple diameters (4 mm and 6 mm) with constant pitch ratio (X/d=8). In experimental part, a staggered arrangement dimpled inner tube distribution with angle 60 o , dimple diameter of 6 mm and constant pitch ratio (X/d=8)is used as well as plain tube. The results illustrate that the heat transfer as Nusselt number for case of staggered dimpled inner tube improved between 7.55 and 11.2 times than plain tube. The numerical results demonstrate that staggered distribution of dimpled inner tube improve the Nusselt number nearly with 50% bigger than that the in-line distribution dimpled tube. The thermal performance factor (TPF) varied from 1.67 to 5.22 for tubes with in-line arrangement while from 4.91 to 8.633 for dimple tubes with a staggered arrangement.

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“…Γ= 𝑢 4 𝑢 5 ;;;;; The realizable k-𝜀 turbulence model was adopted in this study which have been validated in our previous works (Liang et al 2019;Xie et al 2018a).…”

Section: Equation For Turbulence Kinetic Energy K Equation Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Characteristics of Water Flow Into a Dimpled Tube Heat Exchanger: A Parametric Study

Ali¹,

Shehab²

2022

Front. Heat Mass Transf.

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“…In addition, the true stress-strain data, Von Mises Yield Criterion yield criterion, plastic strain flow rule, and isotropic hardening rule are adopted in this paper and same as those in Ref. 18 (ii) Model simplification: To save computer resources and strike a balance between the simulation efficiency and prediction accuracy, the components and parts were simplified. The plain tube only interacts with the teeth during the forming process, and the teeth deformation is negligible compared with that of the plain tube.…”

Section: Finite Element Modelmentioning

confidence: 99%

Research on prediction model of forming mechanical behavior of the dimpled tube based on the response surface methodology

Xie

Guo

Gong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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A new multi-pitch extrusion machine for producing the enhanced heat transfer tube with dimples is proposed for the first time. The goal of the present study is to investigate the forming mechanism and establish a mechanical behavior prediction model for dimpled tubes. The response surface methodology with central composite design was adopted to identify the relationships between independent variables (extrusion depth, pitch, and teeth radius) and responses (stress, plastic strain, and excursion force). The validity of the finite element model and prediction model was verified experimentally and by the analysis of variance technique. The results show that dimples and protrusions are caused by the tube wall bending inward and outward, respectively. The stress, plastic strain, and excursion force increased with increasing extrusion depth, and decreased with increasing extrusion pitch. The changes in teeth radius had no influence on the excursion force.

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Manufacturing of a corrugated double-layered tube for the high-performance compact heat exchanger

Han

Woo

Lee

et al. 2021

Int J Adv Manuf Technol

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Numerical investigation on plastic forming for heat transfer tube consisting of both dimples and protrusions

Cited by 8 publications

References 23 publications

Hydrothermal Characteristics of Water Flow Into a Dimpled Tube Heat Exchanger: A Parametric Study

Hydrothermal Characteristics of Water Flow Into a Dimpled Tube Heat Exchanger: A Parametric Study

Research on prediction model of forming mechanical behavior of the dimpled tube based on the response surface methodology

Manufacturing of a corrugated double-layered tube for the high-performance compact heat exchanger

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