Experimental investigation on thermal performance and fluid flow characteristics in heat exchanger tube with solid hollow circular disk inserts

Kumar, Alok; Chamoli, Sunil; Kumar, Manoj

doi:10.1016/j.applthermaleng.2016.01.081

Cited by 60 publications

(20 citation statements)

References 25 publications

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“…Similar observations were described by other researchers , , , , , . It has been noted that f is a weak function of Re in turbulent regime similar to the other existing correlations , .…”

Section: Resultssupporting

confidence: 87%

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Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Yadav

Sahu

2019

Chem Eng & Technol

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The heat transfer and pressure drop characteristics in annuli of a double-pipe heat exchanger (DPHE) using helical surface disc turbulators (HSDTs) are experimentally investigated. The effect of a helical surface disc turbulator is studied for three pitch ratios, three diameter ratios, and varying Reynolds numbers. Water flows in the inner tube and air through the annulus. The tests are conducted for air with uniform wall temperature condition. The heat exchanger with the least pitch ratio and least diameter ratio was found to exhibit the highest Nusselt number and pressure drop. The thermal performance factor turned out to be greater than unity for all cases. Correlations were developed for Nusselt number, friction factor, and thermal performance.

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“…Similar observations were described by other researchers , , , , , . It has been noted that f is a weak function of Re in turbulent regime similar to the other existing correlations , .…”

Section: Resultssupporting

confidence: 87%

“…The exact dependence of the f ‐value on Re is not clear. Some studies , , reported that f is a weak function of Re . On the contrary, some authors , observed that f strongly depends on Re .…”

Section: Resultsmentioning

confidence: 99%

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Yadav

Sahu

2019

Chem Eng & Technol

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“…Promvonge et al [3] used inclined vortex rings for investigation and found a 1.4 thermal performance factor at their lowest Reynolds number. Kumar et al [4] found a maximum 1.47-times increment in thermal performance over a plain tube in their investigation of perforation in a circular ring with different perforation indexes. Zong et al [5] used a hollow cross-disk insert for their numerical studies of the HE; as a results, they found that the flow nature was three-dimensional with turbulent flow.…”

Section: Introductionmentioning

confidence: 98%

Numerical Analysis for Heat Transfer Augmentation in a Circular Tube Heat Exchanger Using a Triangular Perforated Y-Shaped Insert

Pandey

Singh

2021

Fluids

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The present investigation constitutes CFD analysis of the heat transmission phenomenon in a tube heat exchanger with a Y-shaped insert with triangular perforation. The analysis is accomplished by considering air as a working fluid with a Reynolds number ranging from 3000 to 21,000. The segment considered for analysis consists of a circular tube of 68 mm diameter and 1.5 m length. The geometrical parameter considered is the perforation index (0%, 10%, 20%, and 30%). The constant heat flux is provided at the tube wall and a pressure-based solver is used for the solution. The studies are performed for analyzing the effects of inserts on the heat transfer and friction factor in the circular tube heat exchanger which results in augmented heat transfer at a higher perforation index (PI) and lower friction factor. The investigation results show that the highest heat transfer is 5.84 times over a simple plain tube and the maximum thermal performance factor (TPF) is 3.25 at PI = 30%, Re = 3000.

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“…These turbulators when placed inside the tube disturb the fluid flow and hence decrease the thermal resistance. Some inserts used by researchers are rings, twisted tapes, delta wings and strips [1][2][3][4][5][6][7][8][9][10]. Bhuiya et al [1] in their experimental investigation used double counter twisted tape and varied twist ratio of these tapes.…”

Section: Introductionmentioning

confidence: 99%

“…Nakhchi and Esfahani [6] in their further numerical investigation used perforated conical rings and studied the effect of geometrical parameters on heat transfer process. Solid hollow circular rings were studied by Kongaitpaiboon et al [7], while Kumar et al [8,9] carried the same work and used solid circular and perforated circular rings in their further investigation and found that the perforated circular rings give better enhancement in heat transfer than the solid rings. Singh et al [10] in their experimental investigation used rectangular winglets with circular rings and found circular ring with rectangular winglets enhances performance 1.95 times as compared to that of smooth tube.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

Singh

Kharkwal

Gautam

et al. 2020

J Therm Anal Calorim

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The never-ending demands of humans have led researchers to find more efficient energy conversion technologies. Enhancing heat transfer rate in a tubular heat exchanger through curved circular rings is one type of passive method that is studied in this work. The computational analysis has been done using "FLUENT" module of ANSYS 16.0. The tubular heat exchanger has internal diameter of 68.1 mm, length of 1.5 m and constant heat flux of 1000 W m −2. Air is the working fluid, which flows in Re varying from 3000 to 21,000. After reaching steady state conditions, the Nusselt number and friction factor are calculated for CCR rings. Furthermore, perforation has been done on these rings with perforation index 8, 12 and 16% and thermo-hydraulic properties are investigated. Computational results show that perforating the rings have a significant effect on heat transfer and friction factor. Greater the perforation index, greater is the Nu and TPF. The maximum enhancements obtained in Nu and TPF are 7.4 and 1.56 times, respectively (as compared to that of smooth tube), for PCCR-16%.

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Experimental investigation on thermal performance and fluid flow characteristics in heat exchanger tube with solid hollow circular disk inserts

Cited by 60 publications

References 25 publications

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Numerical Analysis for Heat Transfer Augmentation in a Circular Tube Heat Exchanger Using a Triangular Perforated Y-Shaped Insert

CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

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