Experimental study on the heat transfer enhancement in helically corrugated tubes under the non-uniform heat flux

Akbarzadeh, Sanaz; Valipour, Mohammad Sadegh

doi:10.1007/s10973-020-09385-5

Cited by 45 publications

(6 citation statements)

References 50 publications

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“…Kiwan et al (2020) conducted an experimental investigation of the natural convection heat transfer from a vertical cylinder using porous fins under constant heat flux, steady-state and natural convection conditions; and clear enhancement of heat transfer using porous fins had been obtained. Akbarzadeh and Valipour (2020) conducted an experimental study on the heat transfer augmentation in nine different helically corrugated absorber tubes under the non-uniform heat flux. The thermal performance and heat transfer were considerably increased in the corrugated absorber tubes and the roughness height and pitch ratio had a significant effect on the performance.…”

Section: Convectionmentioning

confidence: 99%

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

et al. 2021

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This review provides a brief literature survey on enhanced heat transfer research published in the English language journals in 2020. A topic search containing either "heat transfer" or "heat transport" or "thermal transport" in the Web of Science resulted in over 28,000 papers published in 2020 and nearly 30% were relevant to heat transfer intensification, which indicates the importance and rapid development of heat transfer enhancement technologies. The chosen studies focus on various heat transfer enhancement research categorized into conduction, convection, radiation, boiling and condensation, energy storage, thermal management, and cross research involving two or more categories. Heat conduction papers are selected from the micro/nanoscale areas with a focus on interfacial phenomena. Important active, passive, and compound techniques for enhancing convective heat transfer are incorporated. Thermal radiation is concentrated on near-2 field radiation and solar energy. Heat transfer enhancement in boiling and condensation as well as in thermal energy storage, renewable and sustainable energy, and thermal management of electronics and high-end equipment is critical in many engineering applications. From the selected literature published in 2020, significant attempts have been made to research and development on heat transfer enhancement technology covering both conventional and emerging techniques. The prospects of the heat transfer enhancement research are reflected according to the literature survey.Research of innovative heat transfer enhancement techniques is immense, encompassing every aspect from understanding the fundamental theory and physical mechanisms of various heat transfer enhancement techniques to their applications. Research of emerging techniques using new interfacial materials, nanofluids, micro-and nano-structures, microchannels, and new compound enhancement techniques incorporating conventional and new techniques becomes popular.However, there are big challenges in understanding the mechanisms, engineering design methodology and applications with these emerging techniques. Many aspects are urgently needed to be investigated and developed to achieve systematic theory, mechanisms and design methodology for applications in thermal processes, energy storage, renewable energy, decarbonized heating and cooling and many industrial and civil sectors.

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Section: Convectionmentioning

confidence: 99%

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

et al. 2021

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“…Akbarzadeh and Valipour [10] investigated the improvement of heat transfer using helically corrugated tubes. Their results showed that using corrugated tubes increased heat transfer by 85-107% and the coefficient of friction by 25-85%.…”

Section: Introductionmentioning

confidence: 99%

A novel method (a tube with successive increase and reduction in diameter) to increase nanofluid heat transfer in a tube

Bedram

2023

Scientia Iranica

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A new geometry has been proposed to increase heat transfer in tubes. This geometry has two phases of increase in diameter and a phase of reduction in diameter with two obstacles. The fluid used was wateraluminum oxide (Al 2 O 3 ) nanofluid. Reynolds numbers (Re) of 2-300 and nanoparticle volume fraction of 0-3.5% have been investigated. Profile of temperature, velocity and pressure has been presented for different Reynolds numbers, nanofluid volume fractions and sections of geometry. In addition, variations of Nusselt number in different Reynolds numbers and volume fractions have been studied. For different Reynolds numbers, "the increase in heat transfer" and "the reduction in pressure drop" of the proposed geometry compared to a simple tube have been presented. For Re=50, increasing the temperature of the fluid of the geometry proposed in this study was 52% higher than that of a simple tube under the same operating conditions. For the Re=50, the pressure drop of the geometry proposed in this study was 24% less than that of a simple tube under the same operating conditions. The results showed that average Nusselt number in the volume fraction of 3.5% was about 4% higher than the average Nusselt number in the volume fraction of 0.5%.

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“…The authors concluded that the increase in Reynolds number (

{Re})

and corrugated angle enhance

{Nu}

. Akbarzadeh and Valipour 24 investigated the influence of pipe roughness on the CHTP of distilled water passing through a corrugated parabolic trough collector. It was found that the CHTP of the corrugated absorber was greatly improved.…”

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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Experimental study on the heat transfer enhancement in helically corrugated tubes under the non-uniform heat flux

Cited by 45 publications

References 50 publications

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

A novel method (a tube with successive increase and reduction in diameter) to increase nanofluid heat transfer in a tube

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

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Experimental study on the heat transfer enhancement in helically corrugated tubes under the non-uniform heat flux

Cited by 45 publications

References 50 publications

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

A novel method (a tube with successive increase and reduction in diameter) to increase nanofluid heat transfer in a 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