Numerical study of the laminar flow and heat transfer characteristics in a tube inserting a twisted tape having parallelogram winglet vortex generators

Lin, Zhihong; Wang, Liang-Bi; Mu, Luwen; Dang, Wei; Zhang, Yongheng

doi:10.1016/j.applthermaleng.2016.12.142

Cited by 54 publications

(12 citation statements)

References 49 publications

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“…It was found that the F-wing showed a higher Nu, pressure drop, and thermal performance than B-wing due to stronger turbulence intensity and flow blockage. Lin et al [88] numerically studied the use of twisted tape with parallelogram winglet vortex generators (VG) as an effective means of reducing the contact area between the fluid and the twisted, thereby reducing f. The major advantage is that both the parallelogram winglet VG and the twisted tape itself contribute to strengthening the local secondary flow which in turn greatly enhances HT at lower pressure drop penalties.…”

Section: Twisted Tapesmentioning

confidence: 99%

Thermal performance enhancement in heat exchangers using active and passive techniques: a detailed review

Bhattacharyya

Vishwakarma

Srinivasan

et al. 2022

J Therm Anal Calorim

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Section: Twisted Tapesmentioning

confidence: 99%

Thermal performance enhancement in heat exchangers using active and passive techniques: a detailed review

Bhattacharyya

Vishwakarma

Srinivasan

et al. 2022

J Therm Anal Calorim

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“…Numerical study of heat transfer characteristics in laminar flow have been carried out by Lin et al, [16] using twisted tape having parallelogram winglet vortex generator. This newly designed twisted tape has two ways to generate secondary flow which includes secondary flow generated by base tape and secondary flow generated by the parallelogram winglet.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow and Heat Transfer Enhancement in A Horizontal Pipe with Plain and Dimple Twisted Tape

Harish¹,

Manjunath²,

Rangaswamy³

2021

ARFMTS

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In order to improve thermo-hydraulic performance of laminar flow various techniques has been used among which a plain tube with twisted tape insert is widely used. The main objective is to numerically study flow field in order to enhance heat transfer, through a circular pipe built in with/without Dimples on twisted strip. Effect of plain and dimple strip on thermo hydraulic performance discussed. The analysis results for laminar range of 800<Re<2000 is obtained with twist ratio of the strip is 3.0. Analysis is carried for full length tape with constant heat flux. The simulation results of Nusselt number versus Reynolds number of the plain, plain twisted tape and Dimple twisted tape with the experimental data give variation of 2.5, 5.75 and 9.5%. The friction factor of Dimple twisted tape tube is 6 to 13 times that of the plain tube. The thermal performance factor of the Dimple twisted tape and plain twisted tape tube is 4 to 15% and 3 to 12 % respectively higher than that of plain tube. Due to increase in thermal performance factor of induced strip with dimples there is an intensification of heat transfer obtained through circular duct with dimple twisted tape insert than that of plain twisted tape and plain pipe. The use of a twisted tube compounded with dimples is feasible in terms of energy saving at lower Reynolds numbers. Present study is applicable for design of compact heat exchanger in order to optimize energy consumption.

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“…The twisted cross-baffle insert was found to generate stronger longitudinal vortices causing greater flow mixing between the core and wall region flows which improves heat transfer. Recently, a novel parallelogram winglet (Lin et al, 2017) was used as insert that is twisted about its longitudinal axis in circular tube. Different axial spacing and winglet attack angle was tried in the numerical analysis for laminar flow regime of air flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of heat transfer and friction factor characteristics of circular tube fitted with an array of semi-elliptical vortex generator inserts

M.S

Fernandes

2021

Cogent Engineering

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This article presents the heat transfer and friction factor characteristics of circular tube fitted with an array of novel semi-elliptical vortex generator inserts using air as working fluid. The study makes use of computational fluid dynamics methodology and the influence of varying aspect ratio (AR = 1, 2, 4 and 6), flow attack angle (45°, 60°, 75° and 90°) and longitudinal pitch (P = 30 mm, 60 mm and 90 mm) of vortex generator is investigated for the turbulent flow Reynolds number regime of 8000-26000. The numerical results reveal that the presence of semielliptical vortex generator has significant influence on both Nusselt number and friction factor characteristics of circular tube. The vortex generators produce strong longitudinal vortices which intensifies fluid mixing near the tube wall region thereby augmenting the heat transfer to the flowing air stream. In addition, the presence of flow impingement effect on the upstream side and flow reattachment zones on the downstream side of vortex generator is found to contribute to enhanced heat transfer. The influence of aspect ratio on heat transfer is found to be more significant than that of flow attack angle. However, both parameters affect the friction factor significantly. On the other hand, the pitch distance of insert significantly affects both heat transfer and friction factor. The maximum rise in Nusselt number and friction factor is about 2.1 times and 6.34 times higher than plain tube, ABOUT THE AUTHOR

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Numerical study of the laminar flow and heat transfer characteristics in a tube inserting a twisted tape having parallelogram winglet vortex generators

Cited by 54 publications

References 49 publications

Thermal performance enhancement in heat exchangers using active and passive techniques: a detailed review

Thermal performance enhancement in heat exchangers using active and passive techniques: a detailed review

Numerical Analysis of Flow and Heat Transfer Enhancement in A Horizontal Pipe with Plain and Dimple Twisted Tape

Numerical investigation of heat transfer and friction factor characteristics of circular tube fitted with an array of semi-elliptical vortex generator inserts

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