Experimental research on heat transfer and flow resistance properties in spiral twisted tube heat exchanger

Dong, Xinyu; Jin, Xiangdong; Li, Peiyue; Bi, Qincheng; Gui, Miao; Wang, Teng

doi:10.1016/j.applthermaleng.2020.115397

Cited by 41 publications

(7 citation statements)

References 20 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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“…The heat transfer enhanced mechanism of twisted tubes are similar with spiral corrugated tubes [6][7][8][9][10][11] and threaded grooved tubes [12]. Secondary flow is generated by variety of tube shape, which periodically destroys the heat transfer boundary layer of the tube wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on heat transfer and flow resistance characteristics of multi-head twisted spiral tube

2022

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A numerical calculation model of multihead twisted spiral tube (MTST) was established. In the range of Reynolds number from 5000 to 35000, the influence of different twisted structure on the flow and heat transfer characteristics of the MTST was studied by numerical calculation. Numerical calculation results indicate that the Nusselt number and friction coefficient increase with the increase in the ratio of outside and inside diameter of the cross-section, the increase in the number of twisted nodes, and the increase in the number of twisted spiral tube heads. Under the condition of the same spiral structure and the same hydraulic diameter, the heat transfer performance of the MTST is better than that of the spiral smooth tube. In addition, through artificial neural network (ANN) analysis, the ratio of outside and inside diameter of the cross-section, number of twisted nodes, and the number of twisted spiral tube heads were optimized to promote the comprehensive heat transfer performance. The performance evaluation criterion is the highest when the ratio of outside and inside diameter of the cross-section is 25/22.5, the number of twisted nodes is 3, and the number of twisted spiral tube heads is 3, which is 1.849 of the spiral smooth tube.

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“…It appears that this kind of combined heat exchange element is more efficient than the three-dimensional tube. Xinyu Dong et al [11] studied the heat transfer characteristics of the three-dimensional tube applied to the hot oil medium by experimental means, and obtained the heat transfer correlation equation.…”

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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Experimental research on heat transfer and flow resistance properties in spiral twisted tube heat exchanger

Cited by 41 publications

References 20 publications

A Numerical Study for a Double Twisted Tube Heat Exchanger

A Numerical Study for a Double Twisted Tube Heat Exchanger

Numerical study on heat transfer and flow resistance characteristics of multi-head twisted spiral tube

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

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