Numerical study on turbulent heat transfer performance of twisted oval tube with different cross sectioned wire coil

Yu, Chuanzhao; Zhang, Haiqing; Wang, Youqiang; Zeng, Min; Gao, Bingjun

doi:10.1016/j.csite.2020.100759

Cited by 50 publications

(12 citation statements)

References 34 publications

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“…In this work, a numerical study was conducted to show the effect of the twisted circular tube in a double-tube heat exchanger for several twisted ratios (5,10,15) on pressure drop, the heat exchanger effectiveness, and the overall performance. The main results are summarized as follows:…”

Section: Discussionmentioning

confidence: 99%

“…They conducted a numerical study on the effect of cross-section and twisted pitches of (TTT) on heat, and also examined the flow and heat transfer characteristics for different twisted direction. Many studies were conducted on the twisted square tube [6][7][8][9], the twisted spiral tube [10][11][12], and the twisted oval tube [13][14][15][16]. Many researchers have conducted extensive research on the twisted tapes, where they studied the effect of the twisted tapes inside the smooth circular tubes on the heat transfer and the pressure drop, Meyer et al [17] made an experimental study on the characteristics of heat transfer and pressure drop in transitional regime of twisted tapes in smooth circular tubes, the experiments were conducted in circular tubes with an inner diameter of 19 mm and a length of 5.27 m and insertion of a twisted tape with ratios of 3,4,5.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study for a Double Twisted Tube Heat Exchanger

Razzaq¹,

Mushatet²

2021

IJHT

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The thermal and fluid physiognomies of a double twisted tube heat exchanger was examined numerically. Twisted engineering is a wide-use method to improve heat transfer in heat exchangers. A counter-flow mode utilizing hot water in the inner tube and cold air in the outer tube was considered. This study aims to progress the thermal performance of the double tube heat exchanger by using twisted tubes instead of plane tubes. The heat exchanger was (1m) length, outer diameter (0.05m) and inner diameter (0.025m), both with a thickness (0.004m). It was tested for different values of twist ratios (Tr= 5, 10, and 15 respectively) and Reynolds numbers (Re=5000 to 30000). The Navier - Stockes and energy equations besides the turbulence model in demand for modelling this physical problem. ANSYS Fluent code was used for the numerical simulation. The results showed that the twisted tube heat exchanger showed increasing heat transfer compared with a plain tube heat exchanger. It was found that the cold outlet temperature, pressure drop and effectiveness are increased as the twist ratio increases.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Numerical Study for a Double Twisted Tube Heat Exchanger

Razzaq¹,

Mushatet²

2021

IJHT

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“…Lei Yang et al [9] studied the comprehensive performance of the three-dimensional tube using water and steam as the heat exchange medium, and found that the three-dimensional tube with low water flow rate has obvious advantages. Chulin Yu et al [10] studied the heat exchange element of the three-dimensional tube and the coil combination. It appears that this kind of combined heat exchange element is more efficient than the three-dimensional tube.…”

Section: Introductionmentioning

confidence: 99%

Study on Comprehensive Performance of Three-Dimensional Tube Applied to Gas–Solid Two-Phase Flow Environment

Liu

et al. 2021

Energies

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The three-dimensional tubular heat exchanger has excellent performance in single-phase flow, but its performance in gas solid two-phase flow is still lacking research. In this paper, analysis and comparison of heat exchanger prototypes made up of four different three-dimensional tubes by different comprehensive performance evaluation methods are carried out through experimental research and theoretical analysis. The research results show that the ratio of the long axis to the short axis of the three-dimensional tube has an important influence on its heat transfer performance and flow resistance. Furthermore, a reasonable ratio can be obtained by comparing its comprehensive performance. Among the comprehensive performance analysis results of four kinds of three-dimensional tubes, the comprehensive performance factor ηo-I of type I is the best which achieves the purpose of heat transfer enhancement. Results from the current research could provide beneficial guidance for further design and application of the three-dimensional tubular heat exchanger.

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“…They found the condensation heat transfer coefficient increased with the tube elliptic ties increased. Yu et al 16 studied the thermal-hydraulic characteristic of the twisted oval tubes. The results showed that twisted tube with wire coil could enhance heat transfer rate, while the performance evaluation criteria decreased.…”

Section: Introductionmentioning

confidence: 99%

Study on flow and heat transfer characteristics for propane in twisted oval and the two-start twisted helically wound tube

Chen²,

Mi³

et al. 2021

Advances in Mechanical Engineering

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In this paper, the numerical simulation was used to study the flow and heat transfer characteristics for twisted oval and two-start twisted helically wound tubes with Reynolds numbers 4000–16,000. The significant factors that affect the flow and heat transfer characteristics were analyzed. The range of twist pitch p is 0.02–0.10 m, and ellipse ratio r is 1.2–2 for twisted oval tube, the groove depth e is 0.4–2 mm for two-start twisted tube. The result showed that the relative friction coefficient and Nusselt number increased with the increase of ellipse ratio r and decreased with the increase of twist pitch p for twisted oval helically wound tube. With the growth of Reynolds number, the effects of twist pitch p and ellipse ratio r on the flow characteristics decreased. In addition, the average level of the thermal enhancement factor TEF of the two-start twisted was higher than that of the twisted oval helically wound tube. The maximum enhancements factor TEF of 1.1312 is obtained with groove depth of 2.0, twisted pitch of 0.02, and Reynolds number of 4000 for the two-start twisted tube. Finally, new empirical formulas for flow and heat transfer in helically wound tubes were proposed for two kinds of enhanced tubes.

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Numerical study on turbulent heat transfer performance of twisted oval tube with different cross sectioned wire coil

Cited by 50 publications

References 34 publications

A Numerical Study for a Double Twisted Tube Heat Exchanger

A Numerical Study for a Double Twisted Tube Heat Exchanger

Study on Comprehensive Performance of Three-Dimensional Tube Applied to Gas–Solid Two-Phase Flow Environment

Study on flow and heat transfer characteristics for propane in twisted oval and the two-start twisted helically wound tube

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