Heat transfer enhancement of fin-tube heat exchangers using punched triangular ramp vortex generator on the fin surface

Tepe, Ahmet Ümit

doi:10.1016/j.ijheatmasstransfer.2021.121326

Cited by 28 publications

(13 citation statements)

References 34 publications

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“…Various researchers have carried out studies on the improvement of heat transfer using passive methods [1][2][3][4][5]. Li et al [6,7] numerically and experimentally studied the effect of using a vortex generator on increasing heat transfer in a finless heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

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Improving heat transfer from surface to airflow is a current research concern for enhancing energy efficiency. The use of vortex generators for improving heat transfer from the surface to the airflow is very effective. Therefore, this study focuses on applying flat and concave vortex generators with and without holes in order to improve heat transfer. In this study, the number of pairs of vortex generators was varied from one to three pairs at a certain angle of attack for various forms of vortex generators. The airflow velocity through the duct was varied in the range of 0.4 to 2.0 m/s at 0.2 m/s intervals. From the investigation results, we observed that the highest thermal performance was found with the use of concave delta winglets without holes for various pairs of vortex generators in terms of the overall Reynolds number. The highest thermal enhancement factor was found to be around 1.42 at a Reynolds number of approximately 9000. From this study, it was also shown that the lowest cost–benefit ratio was about 1.75 at a Reynolds number of approximately 3500 for three pairs of vortex generators.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

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“…These hybrid heat transfer fluids have been found to possess high thermal conductivity compared with the base fluid and also have some advantages over conventional heat transfer fluids, which include higher heat conduction rate, lower pumping power, stability, and among others. 3,4 Various works on the enhancement of CHTP using geometry modification such as the usage of ribs, 5,6 vortex generator, [7][8][9] wavy channel, 10,11 twisted tape inserts, [12][13][14] corrugated tube, [15][16][17] noncircular cross-section, [18][19][20] helical tube, 21 and converging pipe 22 have been reported in the literature. In addition, among the various geometry modifications examined so far, the inwardly corrugated pipe is preferable due to its high thermal efficiency and ease of maintenance.…”

Section: Introductionmentioning

confidence: 99%

“…Various works on the enhancement of CHTP using geometry modification such as the usage of ribs, 5,6 vortex generator, 7–9 wavy channel, 10,11 twisted tape inserts, 12–14 corrugated tube, 15–17 noncircular cross‐section, 18–20 helical tube, 21 and converging pipe 22 have been reported in the literature. In addition, among the various geometry modifications examined so far, the inwardly corrugated pipe is preferable due to its high thermal efficiency and ease of maintenance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of turbulent entropy production rate with SWCNT/H₂O nanofluid flowing in various inwardly corrugated pipes

2022

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This paper presents turbulent heat transfer performance and entropy production rate in different inwardly corrugated pipes with single‐walled carbon nanotube (SWCNT)/H2O nanofluid as a working fluid using the finite volume method approach. The configurations considered were circular, triangular, and trapezoidal. The SWCNT/H2O nanofluid was modeled using a single‐phase approach and the k − ω $k-\omega $ model was used to simulate the turbulent flow. A parametric study was carried out on the effect of Reynolds number (5 × 103 ≤ Re ≤ 3 × 104) and nanoparticle volume ratio (0% ≤ φ ≤ 0.25%) on hydrodynamic, heat transfer performance, thermal entropy production rates (TEPRs; due to mean and turbulent temperature gradients), and viscous entropy production rates (VEPRs; due to mean and turbulent velocity gradients). The results showed that the mean temperature gradient contributes most to the TEPR, compared with the turbulent temperature gradient. However, the opposite was the case for the VEPR. Furthermore, the presence of corrugation decreases the TEPR but enhanced friction factor, Nusselt number, and VEPR. For example, at a Reynolds number of 2.5 × 104, the normalized friction factor, average Nusselt number, TEPR, and VEPR (referencing a smooth pipe) in circularly, triangularly, and trapezoidal corrugated pipes are {3.86, 1.39, 0.80, 3.88}, {3.80, 1.41, 0.72, 3.98}, and {4.34, 1.55, 0.69, 4.19}, respectively.

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“…In most cases, gas is used as the medium for heat exchange in fin‐and‐tube heat exchangers; however, the high thermal resistance on the gas side causes a low heat transfer rate. Therefore, the heat transfer rate on the gas side should be improved to increase the efficiency of this type of heat exchanger 1–3 …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the heat transfer rate on the gas side should be improved to increase the efficiency of this type of heat exchanger. [1][2][3] Studies have been carried out experimentally and numerically to increase the gas side heat transfer rate in fin-and-tube heat exchangers. One of the methods to increase the heat transfer rate is by manipulating the surface geometry of the fins of the heat exchanger to expand their surface.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

Syaiful

Wicaksono

et al. 2022

Engineering Reports

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Improvement of heat transfer using surface protrusion (convex strip) has been effective recently. Surface protrusion is able to improve flow mixing which increases the rate of heat transfer. Therefore, this study aims to improve the heat transfer in a fin-and-tube heat exchanger by fitting convex strips around the tubes. Three-dimensional modeling was carried out by placing four and eight convex strips around the staggered tubes at a constant temperature of 106 • C. The turbulent k-ε model was applied at a Reynolds number range of 3438-15,926.The results of the study indicate that tubes with eight convex strips demonstrated a heat transfer improvement of 40.46%, compared to that with four convex strips. In this case, the TEF is 6.27% higher than the four convex strips. In addition, the synergy angle in the eight convex strips configuration was 0.13% lower than that of the four convex strips configuration. Meanwhile, the flow resistance in the tubes with eight convex strips configurations was 30.96% higher than that of the four convex strips.

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Heat transfer enhancement of fin-tube heat exchangers using punched triangular ramp vortex generator on the fin surface

Cited by 28 publications

References 34 publications

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Investigation of turbulent entropy production rate with SWCNT/H₂O nanofluid flowing in various inwardly corrugated pipes

Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

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Heat transfer enhancement of fin-tube heat exchangers using punched triangular ramp vortex generator on the fin surface

Cited by 28 publications

References 34 publications

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Investigation of turbulent entropy production rate with SWCNT/H2O nanofluid flowing in various inwardly corrugated pipes

Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

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Investigation of turbulent entropy production rate with SWCNT/H₂O nanofluid flowing in various inwardly corrugated pipes