Experimental investigation on heat transfer and pressure drop of internal flow in corrugated tubes

Andrade, Francisco; Moita, Ana S.; Nikulin, Artem; Moreira, A.L.N.; Santos, H.

doi:10.1016/j.ijheatmasstransfer.2019.06.025

Cited by 47 publications

(18 citation statements)

References 31 publications

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“…For such an application, HEX compactness is of crucial importance. As compared to our previous research [15], the internal tube diameter of the corrugated tubes was further reduced from the 5.75 mm (originally) to 4.5 mm in the present study.…”

Section: Introductioncontrasting

confidence: 62%

“…To investigate the entire transitional flow regime, and for continuity purposes, the experimental and numerical results were also given in the laminar and turbulent flow regimes with Reynolds numbers in the range from around 300 up to 5000. Furthermore, to accomplish with the practical applications requisites, the imposed wall heat flux was further increase from 21.1 kW/m 2 [15] to 33 kW/m 2 in the present study. To the best of authors knowledge, this is the maximum heat flux reported in literature studies for the study of corrugated tubes under transitional flow regime.…”

Section: Introductionmentioning

confidence: 90%

“…The original experimental setup used in this work has been previously developed and used to investigate heat transfer enhancement in smooth tubes using nanofluids [29]. Subsequently, such setup has been further adapted and validated by Andrade et al [15] to characterize pressure drop and heat transfer in corrugated tubes. The current version of the experimental setup is schematically represented in Figure 5.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous research [15], we provide a detailed literature survey on the experimental investigations on the heat transfer and pressure drop in helical corrugated tubes. In this section, we present the dimensionless numbers, and the available literature correlations to characterize the heat transfer and pressure drop in helical corrugated tubes under transitional flow regime.…”

Section: Experimental Investigationmentioning

confidence: 99%

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Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Cruz,

Mendes,

Pereira

et al. 2021

Preprint

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The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied in order to characterize the three-dimensional flow and the influence of corrugation geometry on pressure drop and convective heat transfer. With water as working fluid and an imposed wall heat flux, ranging from around 4 to 33 kW/m 2 , a numerical model was developed with a CFD commercial software, where k − ω SST was used to model turbulence. Experimental tests were performed covering Reynolds numbers in the range from around 300 up to 5000, which allowed to identify the transition region and validate the numerical model. The results show that due to the swirl induced by the corrugation, the critical Reynolds number for the start of transition to turbulent flow is reduced. The thermal performance factor, which quantifies the heat transfer enhancement at the expense of pressure drop, was used to compare the corrugated tubes against the reference case of smooth tube. Based on this, all investigated corrugated geometries performed better than the smooth tube, except for low Reynolds numbers (Re < 500) in the laminar regime.Overall, the corrugated tube with the lowest pitch showed a clearly better performance for the intermediate range of Reynolds numbers (1000 < Re < 2300), being an optimal choice for a wider range of operating conditions in the transitional and turbulent flow regimes.

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Section: Introductioncontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Experimental Investigationmentioning

confidence: 99%

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Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Cruz,

Mendes,

Pereira

et al. 2021

Preprint

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“…Wu and Zhou 21 studied the flow and heat transfer characteristics in corrugated tubes, and found the enhancement of heat transfer only occurred at high Reynolds numbers. Andrade et al 22 studied the characteristics of heat transfer and pressure drop of internal flow in a corrugated tubes for different flow regimes. They found that the corrugated tube took a smoother transition, and it is more effective under the transitional flow regime.…”

Section: Introductionmentioning

confidence: 99%

Study on flow and heat transfer characteristics for propane in twisted oval and the two-start twisted helically wound tube

Chen²,

Mi³

et al. 2021

Advances in Mechanical Engineering

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In this paper, the numerical simulation was used to study the flow and heat transfer characteristics for twisted oval and two-start twisted helically wound tubes with Reynolds numbers 4000–16,000. The significant factors that affect the flow and heat transfer characteristics were analyzed. The range of twist pitch p is 0.02–0.10 m, and ellipse ratio r is 1.2–2 for twisted oval tube, the groove depth e is 0.4–2 mm for two-start twisted tube. The result showed that the relative friction coefficient and Nusselt number increased with the increase of ellipse ratio r and decreased with the increase of twist pitch p for twisted oval helically wound tube. With the growth of Reynolds number, the effects of twist pitch p and ellipse ratio r on the flow characteristics decreased. In addition, the average level of the thermal enhancement factor TEF of the two-start twisted was higher than that of the twisted oval helically wound tube. The maximum enhancements factor TEF of 1.1312 is obtained with groove depth of 2.0, twisted pitch of 0.02, and Reynolds number of 4000 for the two-start twisted tube. Finally, new empirical formulas for flow and heat transfer in helically wound tubes were proposed for two kinds of enhanced tubes.

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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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Experimental investigation on heat transfer and pressure drop of internal flow in corrugated tubes

Cited by 47 publications

References 31 publications

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Study on flow and heat transfer characteristics for propane in twisted oval and the two-start twisted helically wound tube

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

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Experimental investigation on heat transfer and pressure drop of internal flow in corrugated tubes

Cited by 47 publications

References 31 publications

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Study on flow and heat transfer characteristics for propane in twisted oval and the two-start twisted helically wound tube

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

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