Swirl flow heat transfer and pressure drop with twisted-tape inserts

Manglik, Raj M.; Bergles, A. E.

doi:10.1016/s0065-2717(02)80007-7

Cited by 116 publications

(58 citation statements)

References 68 publications

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“…Twisted tape inserts have been widely used in many applications given the ease with which they can be made and installed in heat exchangers as well as significant heat transfer enhancement that can be achieved with moderate friction factors [17,18]. The wide application and interest in using twisted tape for both laminar and turbulent flows can be seen in the number of studies dedicated to heat transfer enhancement using twisted tape inserts provided in reviews by…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

“…Manglik [18], Bergles [7], Webb [9] and many others. Several modifications of the twisted tape inserts have also been widely investigated.…”

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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“…They developed correlation of friction factor for combined laminar and turbulent flow and suggest that a single expression is not sufficient to describe heat transfer in transition flow region. As per the Manglik et al [6] the heat transfer enhancement increases with decrease in twist ratio.…”

Section: A Review On Plain Twisted Tapementioning

confidence: 57%

Augmentation of Heat Transfer in a Single Phase Flow Using Simple and Modified Twisted Tape Inserts: A Review

Tank¹

2017

IJRASET

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Heat exchanger is essential devices in process industries, power plant and refineries for the exchange of heat from one fluid to another fluid. It finds wide industrial, commercial and domestic applications. Keeping in mind today's energy crisis lots of researchers are working on active and passive methods for the enhancement of heat transfer rate. Use of twisted tape insert is one of the passive methods of enhancing heat transfer rate in conventional conduits with pressure drop penalty. An exhaustive review has been presented in this paper so it will be ready reference for those who want implement twisted tape insert in the heat exchanger. The experimental investigation of plain twisted tape and modified twisted tape of various configurations with its main findings are presented in compact form. The main focused of the present study is heat transfer enhancement, friction factor and enhancement ratio for the compactness, savings in pumping power for the operation of heat exchanger.

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“…Here the example par excellence is the laminar pipe flow with inserted twisted tape. Manglik and Bergles [20] ). This simple exercise shows that turbulent heat transfer is at least by a factor of 10 to 100 larger than its pure laminar counterpart.…”

Section: Erroneous Scaling Leads To Wrong Conclusionmentioning

confidence: 97%