Parametric study on turbulent heat transfer and flow characteristics in a circular tube fitted with louvered strip inserts

Fan, Aiwu; Deng, Junjie; Nakayama, A.; Liu, W.

doi:10.1016/j.ijheatmasstransfer.2012.05.023

Cited by 88 publications

(26 citation statements)

References 40 publications

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“…The highest value of friction factor was found at pitch-length 40 mm, while the plain tube gave the minimum. Concentric tube fitted with louvered strip insert, the values of friction factor are decreasing with the rise of pitch-length [4]. In the range of 5.300 < Re < 17.500 friction factor of the inner tube fitted with louvered strip insert with different pitch length (40, 50, 60 mm) were 2.91 -3.84; 2.41 -2.92; and 1.88 -2.08 times greater than the plain tube.…”

Section: Friction Factormentioning

confidence: 88%

“…The use of insertion guided to a significant increase in heat transfer and pressure drop over the smooth tube. Mohammed [3] and Fan [4] studied numerically on the convective heat transfer characteristics of heat exchanger fixed with louvered strip insert with various slant angle and pitch length. In the tested range, the Nusselt number increases with the increasing slant angle and tend to decrease with rising pitch length.…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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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: Friction Factormentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In the year 2012, A.W. Fan et al reported on the numerical simulation in a circular tube fitted with louvered strip inserts and found that it is easy to fabricate and can be widely used in the heat transfer exchanger technology [17]. In the year 2013, Bodius Salam et al, experimentally investigated heat transfer in a circular tube using rectangular cut twisted tape insert and increased the performance 38% to 80% compare to the smooth tube [18].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Heat Transfer in a Tubular Pipe Using Different Twisted Tape Inserts

Bhuyan¹,

Deb²,

Shahriar³

et al. 2017

OJFD

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This paper performs a simulation study of the heat transfer phenomena in a tubular U-loop pipe. We have investigated the enhancement of heat transfer with mass flow in a pipe without insert, with full length and short length twisted tape inserts. The length of the pipe is approximately 2436.80 mm long with 29 mm inner and 33 mm outer diameter respectively. A constant heat flux is taken which generated the boundary layer of the pipe close to the flowing fluid around the boundary. The simulations are considered for the stationary and the time dependent module for 35 seconds with different length of inserts. The comparisons are made among the results. We observed that the transfer of heat is enhanced significantly with the increase of the length of inserts inside the computational domain. We also found that, full length twisted tape inserts are more effective than comparing with the short length inserts and without insert.

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“…Huang et al [14] found that the heat transfer rate of the tube with porous inserts is about 1.6e5.5 times larger than the smooth tube. Fan et al [15] investigated heat transfer and flow characteristics numerically in a circular tube fitted with louvered strip inserts.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and friction characteristics of laminar flow through a circular tube with small pipe inserts

Tang

et al. 2015

International Journal of Thermal Sciences

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Parametric study on turbulent heat transfer and flow characteristics in a circular tube fitted with louvered strip inserts

Cited by 88 publications

References 40 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

Simulation of Heat Transfer in a Tubular Pipe Using Different Twisted Tape Inserts

Heat transfer and friction characteristics of laminar flow through a circular tube with small pipe inserts

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