3-D Numerical simulation of swirling flow and convective heat transfer in a circular tube induced by means of loose-fit twisted tapes

Eiamsa-ard, Smith; Wongcharee, K.; Sripattanapipat, Somchai

doi:10.1016/j.icheatmasstransfer.2009.06.014

Cited by 165 publications

(65 citation statements)

References 12 publications

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“…The axial temperature and velocity gradients at the outlet of the domain are given in Eq. (19). At the outlet of the tube, a zero gauge pressure is specified and other flow quantities are extrapolated from the domain by the solver.…”

Section: Fluid Properties and Boundary Conditionsmentioning

confidence: 99%

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Numerical investigation of heat transfer and fluid flow of water through a circular tube induced with divers' tape inserts

Oni

Paul

2016

Applied Thermal Engineering

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An investigation was carried out to analyse numerically heat transfer and flow characteristics of water through a circular tube induced with different twisted tapes. The aim is to know which of the tube designs gives the best performance when compared with a plain tube. Turbulent flow was considered, the walls of the tubes were under uniform wall heat flux, Reynolds number was between 5000 and 20000, and RNG κ-ε model was selected for the simulations. The shape of cuts on the tapes has effects on the performance of the induced tubes. The tube fitted with alternate-axis triangular cut twisted tape has the best performance as its Nusselt number and friction factor are 1.63 -2.18 and 2.60 -3.15 times respectively that of the tube fitted with plain twisted tape while its thermal performance factor is 1.35 -1.43 times that of the tube with plain twisted tape. New correlations were developed for the Nusselt number and friction factors, and reveal that the Nusselt number obtained from the new correlation agrees well with the correlation proposed by Thianpong et al. with a discrepancy of 2.21%. For the friction factor, the discrepancy is 3.01%.

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Section: Fluid Properties and Boundary Conditionsmentioning

confidence: 99%

“…Eiamsa-ard et al [19] investigated numerically the effect which the clearance ratio in a tube induced with twisted tape insert has on the Nusselt number and thermal performance factor. The simulation was conducted in the turbulent regime for the Reynolds number ranging from 3000 to 10000.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of heat transfer and fluid flow of water through a circular tube induced with divers' tape inserts

Oni

Paul

2016

Applied Thermal Engineering

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“…Some modified twisted tapes were designed to minimize pressure loss [1][2][3][4][5]. Patil [1] examined heat transfer and pressure drop characteristics of in tubes with varying width twisted tape inserts.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…In recent years, heat transfer enhancement devices (HTED) have become more prevalent in many engineering applications (e.g., heat exchanger, nuclear/chemical reactor, drying process, refrigeration, gas turbine and more). Heat transfer enhancement techniques (passive and active methods) have been developed for saving materials and reducing sizes of the equipments [1][2][3]. A twisted tape as a swirl generator is one of widely used devices for heat transfer enhancement.…”

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Heat transfer and thermal performance characteristics of heat exchanger tube fitted with perforated twisted-tapes

Thianpong

Eiamsa-ard

2011

Heat Mass Transfer

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Twisted tape insert was applied as a swirling flow generator for the passive heat transfer enhancement in the present work. The influences of the perforated twisted tapes (PTs) on the heat transfer, pressure loss and thermal performance characteristics were investigated experimentally. The experiments were performed under uniform wall heat flux condition by using PTs with y/W = 3, 4 and 5, d/W = 0.11, 0.14 and 0.17 and s/W = 0.4, 0.6 and 0.8 where y is a twist length, d is a perforation hole diameter, s is a spacing between holes (pitch) and W is a tape width. The experimental results reveal that Nusselt number increased with decreasing s/W and y/W and increasing d/W. For the present range, the maximum heat transfer was obtained by utilizing the tape with s/W = 0.4, d/W = 0.17 and y/W = 3, which is higher than those obtained from the plain tube with and without typical twisted tape by around 27.4 and 86.7%, respectively. In addition, the empirical correlations for Nusselt number, friction factor and thermal performance are also proposed in the present paper.

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“…Al-Fahed and Chakroun [30] later investigated the use of wall-separated twisted tape inserts on heat transfer for fully developed turbulent flow. Eiamsa-ard et al [31] also considered the use of loose-fit twisted tape inserts on heat transfer enhancement in a tube. They report high heat transfer enhancement at the lowest twist ratio and the smallest clearance ratio.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and entropy generation in a parabolic trough receiver with wall-detached twisted tape inserts

Mwesigye

Bello‐Ochende

Meyer

2016

International Journal of Thermal Sciences

196

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In this paper, heat transfer enhancement in a parabolic trough receiver using wall-detached twisted tape inserts was numerically investigated. The resulting heat transfer, fluid friction and thermodynamic performance were determined and presented. The flow was considered fully developed turbulent, with Reynolds numbers in range 10 260 ≤ Re p ≤ 1 353 000 depending on the fluid temperature. The twisted tape's twist ratio and width ratio vary in the range 0.50-2.00 and 0.53-0.91, respectively. The numerical investigations are based on a finite volume method, with the realisable k-ε model for turbulence closure. The study shows considerable increase in heat transfer performance of about 169%, reduction in absorber tube's circumferential temperature difference up to 68% and increase in thermal efficiency up to 10% over a receiver with a plain absorber tube. An entropy generation analysis shows the existence of a Reynolds number for which there is minimum entropy generation for each twist ratio and width ratio. The optimal Reynolds number increases with increasing twist ratio and reducing width ratios. The maximum reduction in the entropy generation rate was about 58%. Correlations for heat transfer and fluid friction performance for the range of parameters considered were also derived and presented. Keywords

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3-D Numerical simulation of swirling flow and convective heat transfer in a circular tube induced by means of loose-fit twisted tapes

Cited by 165 publications

References 12 publications

Numerical investigation of heat transfer and fluid flow of water through a circular tube induced with divers' tape inserts

Numerical investigation of heat transfer and fluid flow of water through a circular tube induced with divers' tape inserts

Heat transfer and thermal performance characteristics of heat exchanger tube fitted with perforated twisted-tapes

Heat transfer and entropy generation in a parabolic trough receiver with wall-detached twisted tape inserts

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