A comparative review of self-rotating and stationary twisted tape inserts in heat exchanger

Zhang, Cancan; Wang, Dingbiao; Ren, Kun; Han, Yong; Zhu, Youjian; Xu, Peng; Deng, Jing; Zhang, Xiying

doi:10.1016/j.rser.2015.08.048

Cited by 101 publications

(31 citation statements)

References 80 publications

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“…From literatures [3][4][5][6][7][8][9][10], there are many aspects that influence the use of louvered strip insert (geometry, the arrangement to the flow direction, and shape of louvered strip insert). The main mechanism of heat transfer enhancement due to insertion include the reduction of the hydraulic diameter and induced swirling flow makes a better fluid mixing [11]. Based on the literature this experiment will be carried out to investigate the thermal characteristics of concentric pipe heat exchanger installed with louvered strip insert.…”

Section: Introductionmentioning

confidence: 99%

Influences of pitch-length louvered strip insert on thermal characteristic in concentric pipe heat exchanger

Yaningsih

Wijayanta

2017

MATEC Web Conf.

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Abstract. The effects of pitch-length louvered strip inserts with a forward arrangement on heat transfer and friction factor characteristics in a concentric pipe heat exchanger were experimentally investigated. Louvered strip insert was installed inside the tube. For comparison, the experiment without louvered strip (plain tube) was conducted. All cases were tested under steady state condition for Reynolds number ranging from 5300-17,500. The results show that the utilization of louvered strip insert produced a higher heat transfer rate compare to a plain tube. Nusselt number, friction factor, and heat transfer coefficient ratio increased with decreasing pitch length. The Nusset number for louvered strip insert with S of 40, 50, and 60 mm increasing in the value of 67% -77%; 48% -53%; and 21% -24% than plain tube, respectively. While the tube fitted with louvered strip insert by S of 40, 50, and 60 mm, friction factor increased 2.91 -3.84; 2.41 -2.92; and 1.88 -2.08 times greater than a plain tube. The addition of louvered strip insert with S of 40, 50, and 60 mm producing heat transfer coefficient ratio in the range of 1.02 -1.12; 1.03 -1.07 and 1.03 -1.04.

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Section: Introductionmentioning

confidence: 99%

Influences of pitch-length louvered strip insert on thermal characteristic in concentric pipe heat exchanger

Yaningsih

Wijayanta

2017

MATEC Web Conf.

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“…(12) where "ha" and "hs" are the convective heat transfer coefficient with and without pin fins, correspondingly the following equation can be written for the heat transfer efficiency for the pin fins according to total heat transfer surface area η = = 51.09Re Licensed Under Creative Commons Attribution CC BY Sy/D=1.944, Sy/D=3.417 at constant C/H = 0 will be determine and graph is plot similarly the effect of the clearance ratio on improvement efficiency for different clearance ratio (C/H) ) i.e. C/H=0, C/H=0.333, C/H=1 at constant Sy/D = 1.208 will be determine and graph is plot.…”

Section: Enhancement Of Efficiencymentioning

confidence: 99%

A Review Paper on CFD Simulation of Square Threaded & Helical Twisted Pin Fin Arrays in a Rectangular Channel to Enhance Heat Transfer

2015

IJSR

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“…TT can be stationary or self‐rotating. The first one is held fixed in the tube, while the second one rotates automatically, as the flow passes …”

Section: Introductionmentioning

confidence: 99%

“…The first one is held fixed in the tube, while the second one rotates automatically, as the flow passes. 26 Hejazi and Afshari 27 experimentally examined effects of TT with a various number of twist ratios on heat transfer and pressure drop. They observed better performance for smaller twist ratios.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer enhancement using perforated dual twisted tape inserts in converging‐diverging tubes

Afsharpanah

Pakzad

Amirsoleymani

et al. 2018

Heat Trans. Asian Res.

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In this article, a 3D numerical simulation for investigating friction factor and heat transfer enhancements in case of inserting normal or perforated dual twisted tapes (TTs) in converging‐diverging tubes (CDTs) is presented. The effects of Reynolds number changing from 10,000 to 20,000 and a various number of holes (N = 0, 1, 2, and 3) in TTs, under constant uniform heat flux on tube outer wall and using water as working fluid circumstances, were examined. It was found that generally using dual TTs in CDTs improves the Nusselt number up to 9% compared to bare CDTs. Perforating TTs do not have a noticeable effect on heat transfer, but decrease the friction factor significantly, up to 396% compared to normal dual TT implantation, in higher Reynolds numbers. Following that, thermal performance factor considerably increases up to 57%, compared to CDTs with normal dual TTs. To show the mechanism of these effects, velocity streamlines are presented and will be discussed in this paper.

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A comparative review of self-rotating and stationary twisted tape inserts in heat exchanger

Cited by 101 publications

References 80 publications

Influences of pitch-length louvered strip insert on thermal characteristic in concentric pipe heat exchanger

Influences of pitch-length louvered strip insert on thermal characteristic in concentric pipe heat exchanger

A Review Paper on CFD Simulation of Square Threaded & Helical Twisted Pin Fin Arrays in a Rectangular Channel to Enhance Heat Transfer

Numerical study of heat transfer enhancement using perforated dual twisted tape inserts in converging‐diverging tubes

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