Compound Heat Transfer Enhancement of a Converging-Diverging Tube with Evenly Spaced Twisted-tapes

Hong, Mengna; Deng, Xianhe; Huang, Kai‐Fa; Li, Zhiwu

doi:10.1016/s1004-9541(08)60008-7

Cited by 68 publications

(20 citation statements)

References 16 publications

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“…Several swirl generators have been investigated for enhancing the heat transfer rate [11][12][13][14][15][16][17][18][19][20][21][22][23]. The features of some swirl generators are shown along with the flow pattern of a conventional impinging jet in Fig.…”

Section: Introductionmentioning

confidence: 99%

Visualization of flow and heat transfer characteristics for swirling impinging jet

Nuntadusit

Wae-hayee

Bunyajitradulya

et al. 2012

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Visualization of flow and heat transfer characteristics for swirling impinging jet

Nuntadusit

Wae-hayee

Bunyajitradulya

et al. 2012

International Communications in Heat and Mass Transfer

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“…Bharadwaj et al [35] presented that 75-start spirally grooved tube with twisted tape insert provided the maximum improvement of 600% in the laminar and 140% in the turbulent ranges. Moreover, Hong et al [36] studied the impact of a converging-diverging tube with evenly spaced twisted tapes (CD-T tube) on heat transfer characteristics. It is concluded from their studies that the best performance among the four types of tested twisted tapes can be expected from the one with twist ratio = 4.72 and rotation angle = 180 ∘ .…”

Section: Modified Tube With Twistedmentioning

confidence: 99%

Heat Transfer Enhancement by Using Different Types of Inserts

Tabatabaeikia

Mohammed

Ghazali

et al. 2014

Advances in Mechanical Engineering

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Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. Two of the most effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. There are different kinds of inserts employed in the heat exchanger tubes such as helical/twisted tapes, coiled wires, ribs/fins/baffles, and winglets. This paper presents an overview about the early studies on the improvement of the performance of thermal systems by using different kinds of inserts. Louvered strip insert had better function in backward flow compared to forward one. Modifying the shape of twisted tapes led to a higher efficiency in most of the cases excpet for perforated twisted tape and notched twisted tape. Combination of various inserts and tube with artificial roughness provided promising results. In case of using various propeller types, heat transfer enhancement was dependent on higher number of blades and blade angle and lower pitch ratio.

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“…Many researchers performed surveys on passive enhancement method of this kind, which were very inspiring, such as channel with a cylinder roughness [9] and compound heat transfer enhancement of a convergent-divergent tube with a twisted tape [10]. Swirling flow may increase the heat transfer through the boundary-layer by interruption or thinning and also increase the turbulence levels considerably [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of forced convection in a twisted tube

et al. 2019

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Original scientific paper https://doi.org/10.2298/TSCI19S4043BIn the present paper, along with experimental study, CFD analysis of forced convection in a twisted tube is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. The predictions are observed to show a good agreement with the measurements and published correlations of other authors. The analysis indicates that the large length ratio and small pitch ratio yields a higher heat transfer rate with relatively low performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2500 to 3500 for all cases. For almost all investigated cases the performance factors are greater than unity.

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Compound Heat Transfer Enhancement of a Converging-Diverging Tube with Evenly Spaced Twisted-tapes

Cited by 68 publications

References 16 publications

Visualization of flow and heat transfer characteristics for swirling impinging jet

Visualization of flow and heat transfer characteristics for swirling impinging jet

Heat Transfer Enhancement by Using Different Types of Inserts

Experimental and numerical analysis of forced convection in a twisted tube

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