Flow and heat transfer in swirl tubes — A review

Seibold, Florian; Ligrani, Phillip M.

doi:10.1016/j.ijheatmasstransfer.2021.122455

Cited by 31 publications

(5 citation statements)

References 84 publications

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“…Consideration is further confined to cases where the flow is nominally axisymmetric, and where vortex breakdown, leading to the formation of the central recirculation zone, does not occur. Seibold et al (2022) present a comprehensive review of flow and heat transfer in swirl tubes. Kitoh (1991), using hot-wire anemometry, obtained detailed measurements of the mean velocity components and the Reynolds stresses.…”

Section: Introductionmentioning

confidence: 99%

A turbulence modeling study of the precessing vortex core in a pipe flow

Reis

Younis

2023

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

A turbulence modeling study of the precessing vortex core in a pipe flow

Reis

Younis

2023

Chemical Engineering Science

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“…Swirl flow provides tangential velocity noticeable on the fluid flow downstream. Swirl flow played a vital role in producing secondary flow, which is the main factor for improving heat transfer in many thermal performance applications [1][2][3]. When the target outcome is to improve heat transfer, keeping the pressure drop at the appropriate level is still a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Four-Lobe Swirl Generator and its Transition Parts Under a Different Type of Nanofluids

Diabis

Talib²,

Altarazi³

et al. 2022

CFDL

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Due to the importance of promoting the thermal performance of heat exchangers, innovating a new technique is the main goal of many researchers. In swirl flow techniques, keeping the pressure drop at the practical level still requires more and more attention. In the current paper, a numerical study is conducted to explore the impact of a novel lobe swirl generator and its transition parts on forced convective heat transfer and friction factor in a circular pipe subjected to constant heat flux.The swirl mechanism is investigated at the pitch to a diameter of P/D = 8 as the optimum design. The transition part under several parameters of variable beta (β), transition multiplier (n= 0.5) and variable helix (t = 1) have been adopted. The effect of SiO2, Al2O3, and CuO volume concentrations (1 to 5%) in water under various Reynolds numbers (Re) from 15,000 to 35,000 have been carried out. The turbulent swirling flow was modelled using the applicable shear-stress transport (SST) k-ω. The outcome demonstrated an enhancement in heat transfer value ranging from 1.35 to 1.87 with an increased pressure drop value from 1.23 to 1.67. It was also found that using SiO2/water at 5% volume concentration and Re 15000 created the highest thermal performance, with a significant factor of 1.67.

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“…The working principles and the separation performances of hydrocyclones have been reviewed in many studies 40–42 considering their wide applications. In addition, reviews on separation models concerning the removal of droplets/particles from the gas phase can also be found in References 43–45.…”

Section: Introductionmentioning

confidence: 99%

“…It is noteworthy that the mechanism of gas core instability with high gas content differs from the ultralow gas content condition considering the intense interactions between two phases. 38,39 The working principles and the separation performances of hydrocyclones have been reviewed in many studies [40][41][42] considering their wide applications. In addition, reviews on separation models concerning the removal of droplets/particles from the gas phase can also F I G U R E 1 Configuration of the axial separator for gas-liquid separation 12 F I G U R E 2 Schematic diagram of the separation mechanism including the two issues concerned.…”

Section: Introductionmentioning

confidence: 99%

Review on key issues of an axial gas–liquid separator for ultralow gas content

Yin

Zhang

et al. 2022

AIChE Journal

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The separation of gas and liquid is a topic of general interest in science and engineering, for which tremendous efforts are endeavored to develop separators with high efficiency and reliability. However, when it comes to ultralow gas content, some of the separators fail. A special separator finds the potential herein, which consists of a swirl vane, a swirl chamber and a recovery vane. When the gas–liquid mixture goes through the swirl vane, bubbles will be concentrated into the swirl chamber center and evolved into a gas core. However, two key issues need to be addressed for the axial separator before industrial applications. One issue is that all the bubbles must be captured without exception, that is, the separation efficiency is close to 100%. The other issue is the stability of the gas core, the shape of which is sometimes rectilinear and sometimes spiral. A successful separation relies on the rectilinear shaped gas core. Focused on the two issues above, tremendous experimental, numerical and theoretical investigations have been carried out. In this article, the key challenges and solutions for the two issues are summarized.

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Flow and heat transfer in swirl tubes — A review

Cited by 31 publications

References 84 publications

A turbulence modeling study of the precessing vortex core in a pipe flow

A turbulence modeling study of the precessing vortex core in a pipe flow

Thermal Performance of Four-Lobe Swirl Generator and its Transition Parts Under a Different Type of Nanofluids

Review on key issues of an axial gas–liquid separator for ultralow gas content

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