Heat transfer enhancement in three-start spirally corrugated tube: Experimental and numerical study

Kareem, Zaid S.; Abdullah, Shahrir; Lazim, Tholudin Mat; Jaafar, Mohammad Nazri Mohd.; Wahid, Ammar F. Abdul

doi:10.1016/j.ces.2015.06.009

Cited by 75 publications

(23 citation statements)

References 23 publications

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“…The main research efforts over the last five years have been focused on investigating spirally or transversally corrugated tubes and channels, fins or inserts of wavy strip tapes, and other techniques that allow disturbance of thermal boundary layers [8][9][10][11][12][13][14][15][16]. A concept of fluted tubes was investigated by Srinivasan et al [12].…”

Section: Introductionmentioning

confidence: 99%

Elliptical double corrugated tubes for enhanced heat transfer

Navickaitė

Cattani

Bahl

2019

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Elliptical double corrugated tubes for enhanced heat transfer

Navickaitė

Cattani

Bahl

2019

International Journal of Heat and Mass Transfer

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“…Enhanced heat transfer in laminar flow in three-start spirally corrugated tubes was reported by Kareem et al. 13 Their results showed that the heat transfer enhancement, friction factor, and thermal performance of corrugated tubes were higher than those of a smooth tube in the ranges of 2.4–3.7, 1.7–2.4, and 1.8–3.4 higher, respectively. Eiamsa-ard et al.…”

Section: Introductionmentioning

confidence: 69%

“…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%

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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“…In the investigation, they proposed four models: one-start, two-start, three-start, and four-start spirally corrugated tubes in RBHXsSCT (rod-baffle heat exchangers with spirally corrugated tubes), and the results showed that when Reynolds number ranged from 6,000 to 18,000, compared with RBHX (rodbaffle heat exchangers with plain tubes), the heat transfer quantities were higher and the pressure drop was lower. Kareem et al [27] studied the heat transfer enhancement in a three-start spirally corrugated tube experimentally and numerically, and found that at low Reynolds number; the three-start spirally corrugated tube can improve the heat transfer significantly with a modest increase in the friction factor. Chen et al [28] conducted an experiment, focusing on the nonsymmetric nature of the corrugation angles along the longitudinal direction of four-start spirally corrugated tubes, and found that altering the internal non-symmetric wavy shapes of the tubes enabled to manipulation of the heat transfer and friction characteristics.…”

Section: Introductionmentioning

confidence: 99%