Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube

Jin, Zhi Min; Chen, Fu qiang; Gao, Zhi-xin; Gao, Xiao Fei; Qian, Jin

doi:10.1016/j.ijheatmasstransfer.2016.12.091

Cited by 56 publications

(19 citation statements)

References 27 publications

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“…It should be noted that the numerical results of heat transfer behavior of Jin et al. 17 and Balla 18 were not the same. The differences are attributed to the variation of tube geometries as shown in Figure 3(b) and (c).…”

Section: Introductionmentioning

confidence: 86%

“…Heat transfer improvement by single-start corrugated tubes was reported by many investigators. 1–18 In 1969, Kidd 1 investigated heat transfer and pressure drop of gas flow inside spirally corrugated tubes with groove depths of 0.003–0.028 in. He found that all the spirally corrugated tubes tested gave higher heat transfer than a smooth tube.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, six-start spirally corrugated tubes were proposed by Jin et al. 16,17 They reported that the six-start spirally corrugated tubes gave higher heat transfer than a smooth tube and four-start spirally corrugated tubes. As corrugation pitch was increased, both the heat transfer coefficient and friction losses dropped.…”

Section: Introductionmentioning

confidence: 99%

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Counter-rotation vortex flows and heat transfer mechanisms in a V-spirally-corrugated tube

Eiamsa-ard

Promthaisong

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The flow and heat transfer behavior of newly designed V-corrugated tubes with various numbers of starts ( N = 2, 3, 4, and 5), depth ratios ( DR = 0.02–0.14), and pitch ratios ( PR = 1.0–2.0) were studied in the turbulent flow region (5000 ≤ Re ≤ 20,000). The friction factor ( f), friction factor ratio ( f/ f0), Nusselt number ( Nu), Nusselt number ratio ( Nu/ Nu0), and thermal enhancement factor ( TEF) values are reported. The computational results indicate that the conventional spirally-corrugated tube create swirl flows while V-corrugated tubes generate a counter-rotating vortex flow that impinges upon the lower zone of the tubes and enhances fluid transfer between tube core and near-wall regions. The results also show that the f, Nu, f/ f0, Nu/ Nu0 monotonically increase with decreasing PR, increasing DR and N, while the TEF is dependent on a tradeoff between f/ f0 and Nu/ Nu0. Over the studied range, the f/ f0, Nu/ Nu0, and TEF were in the ranges of 1.36–43.82, 1.00–5.35, and 0.80–2.11, respectively. The maximum TEF, 2.11, was achieved with a V-corrugated tube with an N of 4, DR of 0.06, and PR of 2.0 at Re = 5000.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Counter-rotation vortex flows and heat transfer mechanisms in a V-spirally-corrugated tube

Eiamsa-ard

Promthaisong

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Balla [12] conducted a numerical study and studied the effects of corrugation characteristics on heat transfer performance. Jin et al [13][14] also investigated six-start spirally corrugated tubes and obtained a criterion correlation for flow resistance as well as heat transfer characteristics. Sun et al [15] and Vocale et al [16] applied the field synergy theory to analyse the augmentation effect.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer study on a hybrid smooth and spirally corrugated tube

et al. 2018

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Corrugated tubes are widely used in a range of applications for heat transfer enhancement. The spirally corrugated tube has a better heat transfer performance than the smooth tube. In this paper, the heat transfer performance of a hybrid smooth and six-start spirally corrugated tube is studied. With a validated numerical model, the effects of the corrugation part length on the vortex in the downstream smooth tube are studied for a range of high Reynolds numbers, where the existence of the corrugation part can turn out the secondary flow and enhance heat transfer. Meanwhile, it is found that in the smooth part, the fluid flow part with whirling can reach a maximum length, even if the length of the corrugation part continuously increases. Thus a series of critical corrugation lengths can be obtained. This work can reveal the enhanced heat transfer mechanism of the hybrid smooth and spirally corrugated tube and be of interest to researchers in heat transfer issues of corrugated tubes.

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“…In our previous work [30][31][32], the effects of pitch and corrugation depth on heat transfer performance and flow resistance characteristics inside a six-start spirally corrugated tubes have been studied numerically by calculating the Nusselt number and flow resistance coefficient. However, for the heat transfer and flow resistance on the shell side research, investigations are missing.…”

Section: Introductionmentioning

confidence: 99%

A geometric study on shell side heat transfer and flow resistance of a six-start spirally corrugated tube

Qian

Chen

et al. 2018

Numerical Heat Transfer, Part A: Applications

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Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube

Cited by 56 publications

References 27 publications

Counter-rotation vortex flows and heat transfer mechanisms in a V-spirally-corrugated tube

Counter-rotation vortex flows and heat transfer mechanisms in a V-spirally-corrugated tube

Heat transfer study on a hybrid smooth and spirally corrugated tube

A geometric study on shell side heat transfer and flow resistance of a six-start spirally corrugated tube

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