Heat transfer enhancement by helically twisted tapes inducing co- and counter-swirl flows

Nanan, K.; Yongsiri, K.; Wongcharee, K.; Thianpong, Chinaruk; Eiamsa-ard, Smith

doi:10.1016/j.icheatmasstransfer.2013.05.015

Cited by 45 publications

(11 citation statements)

References 11 publications

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“…Correlation of Dittus-Boelter, Nu = 0:023Re 0:8 Pr 0:4 for heating (6) Correlation of Petukhov, f = 0.79 (lnRe−1:64) −2 (7) En Thermal performance ratio = (Nu/Nuo)/(f/fo) 0.33 (8) The comparison of Nusselt number and friction factor obtained from the present plain square duct with those from correlations of Equations (6), (7) are represented. The above graph presents variant of Nusselt number with Reynolds number for plain square duct using air as test fluid.…”

Section: Resultsmentioning

confidence: 98%

“…Maximum performance values are 1.88 and 1.33 are recorded for nanofluid and water. K. Nanan et.al [6] have conducted an experiment for determining heat transfer enhancement by inserting helically twisted tapes, to induce co-and counter-swirl flows, The experiments were performed for fully developed turbulent flow with Reynolds number range between 6000 and 20,000, under uniform wall heat flux condition. nusselt number and friction factor increase with decreasing pitch ratio, while thermal performance factor possesses opposite trend.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer and Friction Factor Characteristics in Twisted Square Ducts

Kumar¹

2018

IJMEA

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The present work experimental and numerical investigations have been carried out to study friction factor and heat transfer characteristics of twisted square ducts. Experiments were conducted for different velocities of air under constant heat flux condition, twist ratio is equal to 6.12 and also Reynolds number varied from 8000 to 30000. The experimental analysis has been carried out and the experimentation is completely based upon design of experiments to get the optimum heat transfer rate and minimize pressure drop. The results of friction factor, Nusselt number and thermal performance factor are presented. Twisted square duct shows relatively higher heat transfer and optimum pressure drop compared to plain square duct. The experimental results shows that Nusselt number for the twisted square duct is about 1.89 times above that for the plain square duct while friction factor is 2.29 times higher (f/fo= 2.29). Thermal performance (enhancement ratio) of the twisted square duct is 1.41. In this work Numeric simulations were calculated by using the CFD software package ANSYS 18.2 FLUENT has been used. Heat transfer and numerical flow behaviors such as temperature, friction factor contours of the are also reported. Hence it is concluded that square duct with twist ratio 6.12 gives highest heat transfer and thermal performance due to lowest friction loss indicating promising device of the twisted square duct.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Friction Factor Characteristics in Twisted Square Ducts

Kumar¹

2018

IJMEA

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“…Nanan, K. Yongsiri, K. Wongcharee, C. Thianpong, S. Eiamsa-ard [10] carried out an experimental investigation to evaluate heat transfer enhancement using helical twisted tape inducing co and counter swirl flow. Tape pitch ratio (p/D) was varied between 1.0 and 2.0, while tape width ratio (w/D) and twist ratio (y/w) were fixed at 0.2 and 3.0, respectively.…”

Section: International Journal Of Advance Engineering and Research Dementioning

confidence: 99%

Heat Transfer Enhancement Using Twisted Tape Insert: A Review

2017

IJAERD

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“…Laramee et al 11 concluded that texture-based flow visualization algorithms were impressive, adroit and suitable for extensive spectrum of applications. Nanan et al 12 conducted experiments for twisted tapes with co-and counter swirl helical preparation to analyze the thermal performance, friction factor and heat transfer characteristics. Counter Helical Twisted Tape (C-HTT) exhibits lesser thermal performance factor than Co Helical Twisted Tape (Co-HTT).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on heat transfer augmentation of transverse twisted tapes in a confined rectangular channel

Jaganathan

Sivasubramanian

2020

Measurement and Control

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This study investigates the influence of twisted tape inserts on a flow pathway in transverse direction of a flow situation. An array of twisted tapes was mounted on the confined channel to disturb the flow to enhance the heat transfer. The test section had 20 twisted tapes of 35-mm height, 10-mm width and a twist angle of 180°mounted on a silica gelcoated plate. Experiments were conducted on the fabricated experimental setup for different discharge conditions. The Reynolds number considered for the study ranged from 2300 to 3500, and the heat inputs varied from 50 to 250 W, with an interval of 50 W. To visualize the presence of twisted tapes on the flow path, the rectangular channel was visualized by laser flow visualization method, which reported the impact of the twisted tapes on the flow. The existence of twisted tape affects the flow, and it forms a swirl that provides a proper mixing of fluid to enhance heat transfer. The outcome of the present investigation provides a solution to enhance heat transfer and proposes the use of twisted tapes instead of using segmented fins in design of fins.

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Heat transfer enhancement by helically twisted tapes inducing co- and counter-swirl flows

Cited by 45 publications

References 11 publications

Heat Transfer and Friction Factor Characteristics in Twisted Square Ducts

Heat Transfer and Friction Factor Characteristics in Twisted Square Ducts

Heat Transfer Enhancement Using Twisted Tape Insert: A Review

Experimental investigation on heat transfer augmentation of transverse twisted tapes in a confined rectangular channel

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