Development of Correlations for Friction Factor and Heat Transfer Coefficient for Square and Hex Duct with Twisted Tape Insert in Laminar Flow

Yadav, Rupesh J.; Kore, Sandeep S.; Raibhole, V. N.; Joshi, Prathamesh S.

doi:10.1016/j.proeng.2015.11.337

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…400 to 2500 were the ranges of Reynolds number. Finally they had concluded the plain duct with insertion of twisted tape has a raise in Friction Factor and Nusselt number [14].…”

Section: Influence Of Geometry Of Twisted Tape Insert On Heat Transfementioning

confidence: 99%

Influence of Geometry of Twisted Tape Insert on Heat Transfer Augmentation

Sathyaraj,

Jaganathan,

Sivasubramanian

2019

IJEAT

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Heat exchangers are commonly used devices in several industrial applications owing to their high performance in transferring the heat from the hot nature to cold nature. Heat exchangers are necessary for saving energy, there are lots of methods implied to increase the thermal performance of heat transfer device by changing the surface of the flow area of the fluids.in most of the methods there is an insertion in the flow passage like twisted tape or blocks to make a disturb in the flow. Mainly these twisted tapes have a vital role in the heat transfer characters. In this present paper the various techniques used in increasing the heat transfer with the insertion of twisted tape and its geometrical influences on the performance of heat transfer were studied and reported.

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“…400 to 2500 were the ranges of Reynolds number. Finally they had concluded the plain duct with insertion of twisted tape has a raise in Friction Factor and Nusselt number [14].…”

Section: Influence Of Geometry Of Twisted Tape Insert On Heat Transfementioning

confidence: 99%

Influence of Geometry of Twisted Tape Insert on Heat Transfer Augmentation

Sathyaraj,

Jaganathan,

Sivasubramanian

2019

IJEAT

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“…In the past ten years, passive techniques have garnered considerable interest and have been thoroughly investigated by scholars in the field of HE enhancement [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Yadav et al [6] conducted an experimental and numerical investigation for square and hexagonal ducts with various TT inserts, and also correlation was developed for HT and 𝑓 within the range, compared the non-circular ducts (square and hexagonal duct) with circular ducts and found that there was an enhancement in HT at low twist ratio (𝑇𝑅 = 3.5). Feng et al [7] investigated TT fitted with a mini-square channel for laminar flow under the range (419 ≤ 𝑅𝑒 ≤ 884, 0.33 ≤ 𝐿𝑅 ≤1).…”

Section: Introductionmentioning

confidence: 99%

Impact of hyperbolic-cut twisted tape on heat transfer, friction factor and thermohydraulic performance of heat exchanger tube: an experimental study using Internet of Things (IoT) approach

Rajan

2024

Multiscale and Multidiscip. Model. Exp. and Des.

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In this experimental investigation, our primary objective was to assess the collective impact of hyperbolic-cut depth and width cuts on twisted tape (TT) inserts within a heat exchanger tube (HET) operating under laminar flow conditions encompassing a Reynolds number (𝑅𝑒) range of (100 ≤ 𝑅𝑒 ≤ 1500). The insert utilized featured hyperbolic cuts along its edges of tape. The hyperbolic-cut depth and cut width were varied between (3 mm ≤ 𝑏 ≤ 12 mm) and (10 mm ≤ 𝑐 ≤ 16 mm) for a constant twist ratio. To minimize inaccuracies and enhance automation, we implemented the Internet of Things (IoT) methodology to monitor supplementary input and output variables and measure flow rates. This method produced more dependable outcomes by reducing the need for human involvement. The results of the current investigation suggest that specific alterations to the TT configuration resulted in a noteworthy enhancement in heat transfer efficiency, friction factor, and overall thermohydraulic performance metrics. The enhancements were notable, showcasing a rise in the Nusselt number varying from 43.42% to 529.50 % and elevation in the friction factor spanning 136.74 to 738.40 %, respectively, when compared to the plain tube. At 𝑅𝑒 = 1500, 𝑐 = 16 mm yields the best performance of 4.43.Moreover, an exhaustive examination uncovered outstanding performance across all 𝑅𝑒 compared to prior research. In addition, empirical correlations have been established for predicting the Nusselt number and friction factor. Furthermore, research efforts were dedicated to investigating the flow and thermal behaviors through experimental work to enhance our comprehension of heat transfer mechanisms.

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“…Hexagonal-shaped cross-sectional channels are generally encountered in nuclear engineering applications, waste heat recovery, cooling systems of electronic devices and lamella type compact heat exchangers used in many industries such as paper, alcohol, petrochemical and food [3]. Literature review shows that laminar [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and turbulent [19][20][21][22][23][24][25][26][27][28][29] heat transfer and fluid flow in hexagonal channels are examined by some researchers. Rokni and Gatski [19] predicted turbulent heat transfer and turbulent fluid flow in non-circular channels including rectangular cross-sectional duct with aspect ratio 2.…”

Section: Introductionmentioning

confidence: 99%