Thermal characteristics in a heat exchanger tube fitted with dual twisted tape elements in tandem

Eiamsa-ard, Smith; Thianpong, Chinaruk; Eiamsa-ard, P.; Promvonge, Pongjet

doi:10.1016/j.icheatmasstransfer.2009.08.010

Cited by 155 publications

(53 citation statements)

References 14 publications

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“…Eiamsa-ard et al [6] have investigated experimentally the effect of regularly-spaced dual twisted tapes with variable twist and space ratios in comparison with single and dual full-length twisted tapes.…”

Section: Experimental Investigationsmentioning

confidence: 99%

“…1, Δp s are the total shell-side pressure drop excluding nozzles, Δp c is the combined pressure drop of all the interior cross flow section (baffle tip to baffle tip), Δp w is the combined pressure drop in all the windows crossed and Δp e is the pressure drop in the two end zones As a general conclusion, it can be said that correlation based approaches may indicate the existence of a weakness in the design, but CFD simulations can also pinpoint the source and the location of the 6 weakness. Using CFD, together with supporting experiments, may speed up the shell-and-tube heat exchanger design process and may improve the quality of the final design.…”

Section: Analytical Investigationsmentioning

confidence: 99%

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Heat transfer and friction characteristics of shell and tube heat exchanger with multi inserted swirl vanes

Yehia

Attia

Abdelatif

et al. 2016

Applied Thermal Engineering

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Section: Experimental Investigationsmentioning

confidence: 99%

Section: Analytical Investigationsmentioning

confidence: 99%

Heat transfer and friction characteristics of shell and tube heat exchanger with multi inserted swirl vanes

Yehia

Attia

Abdelatif

et al. 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%

“…Saha et al [3] numerically studied the heat transfer and flow friction characteristics of laminar swirl flow through a circular tube fitted with regularly spaced twisted-tape elements. Regularly-spaced twisted tapes were also utilized in form of dual twisted tapes [4]. Eiamsa-ard et al [5] investigated the heat transfer, friction factor and thermal performance characteristics in a tube with short-length twisted tape at several tape length ratios.…”

Section: List Of Symbolsmentioning

confidence: 99%

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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“…Correlations between the Nusselt number, friction factor and heat transfer enhancement coefficient (η) of the tube with a single twisted tape insert were established by Eiamsa-ard et al (2010c). These are expressed as follows and can be used in different twisted ratios: These aforementioned correlations were developed from specific experimental conditions and thereby they are applicable to finite instances.…”

Section: Correlations Between the Nusselt Number And Friction Factorsmentioning

confidence: 99%

The current situation of the study on twisted tape inserts in pipe exchangers

Man

Wang

Yao

2014

J. Marine. Sci. Appl.

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Heat transfer enhancement is used in many applications including heat exchangers, air conditioning, and refrigeration systems; hence many researchers have conducted experimental and numerical researches on heat transfer enhancement and have developed various techniques and methods. As a passive heat transfer technique, twisted tapes are widely used in various industries for their cost savings, lower maintenance requirements and the fact that they are easily set up. This paper introduces the principle of heat transfer enhancement of twisted tapes and reviews some of the experimental works done by researchers on this technique in recent years. The variously modified twisted tape inserts are widely researched and used to enhance heat transfer efficiency for heat exchangers. Twisted tapes perform better in low Re conditions and in square tubes. However, they could also cause higher pressure drops. Twisted tapes have great potential and profound implications if they can be used in traditional heat exchangers. Besides this, some correlations between the Nusselt number and friction factors are presented in this paper.

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Thermal characteristics in a heat exchanger tube fitted with dual twisted tape elements in tandem

Cited by 155 publications

References 14 publications

Heat transfer and friction characteristics of shell and tube heat exchanger with multi inserted swirl vanes

Heat transfer and friction characteristics of shell and tube heat exchanger with multi inserted swirl vanes

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

The current situation of the study on twisted tape inserts in pipe exchangers

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