Numerical investigations of circular tube fitted with helical screw-tape inserts from the viewpoint of field synergy principle

Guo, Jiangfeng; Xu, Mingtian; Cheng, Lin

doi:10.1016/j.cep.2010.02.011

Cited by 52 publications

(15 citation statements)

References 20 publications

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“…Hence it is quite important to employ an appropriate turbulence model for numerical simulations. As a widely-used turbulence model, SST k-x model has its own particular advantage when predicting heat transfer and flow through tubes fitted with twisted tapes [1,15,43]. In order to guarantee the accuracy of computations, a method validation is achieved employing SST k-x model.…”

Section: Methods Validationmentioning

confidence: 99%

Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al 2 O 3 -water nanofluid

Zheng

Xie

Zhang

2017

International Journal of Heat and Mass Transfer

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Section: Methods Validationmentioning

confidence: 99%

Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al 2 O 3 -water nanofluid

Zheng

Xie

Zhang

2017

International Journal of Heat and Mass Transfer

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“…The SST k-ω model as a standard utilized turbulence model has its specific preference for predicting the heat transfer and flow properties through pipes fitted by spiral center plates [1,16,47]. According to Guo and et al [47] results, SST-Kω is the finest model for twisted tapes than the RNG turbulent model in compare to correlations. For computations precision guarantee, validation method is gain by using SST k-ω as a turbulence model.…”

Section: Validation Methodsmentioning

confidence: 99%

Numerical study on heat transfer and nanofluid flow in pipes fitted with different dimpled spiral center plate

Khouzestani

Ghafouri

2020

SN Appl. Sci.

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This research presents a numerical study on heat transfer and flow characteristics for two pipe fitted by two different dimpled spiral center plate by utilizing Al 2 O 3 , CuO and TiO 2 nanofluids as cooling fluids. Considering the effect of dimples arrangement, nanoparticle diameter d p , nanofluids volume fraction φ and also the heat transfer coefficient, thermal property. Average amount of entropy generation S a and maximum local temperature of wall T max were discussed. Results demonstrate that the in-line arrangement geometry behaves better in compare to the geometry with the staggered arrangement. 47.3% is the maximum enhancement of convection heat transfer for the in-line arrangement in compare with the smooth spiral central plate with base flow. Using nanofluids improved the wall temperature distribution, and using nanofluid caused great improvement in thermal conductivity with a little raise in dynamic viscosity. Using nanofluids caused a considerable decrease in S a , which also as the result of rising φ, and S a maximum reduction is about 24.7%. T max considerably declines by using nanofluids and enhanced by a rising φ. Also, CuO-water nanofluid has a better effect on heat transfer and flow characteristics than the other nanofluids.

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“…Due to the obvious secondary flow phenomenon in the internal spiral‐grooved tube, the turbulence of the fluid is improved. Meanwhile, according to the field synergy principle, the production of the secondary flow phenomenon increases the synergistic degree between the velocity field and the temperature field and greatly improves the heat transfer efficiency of the fluid inside the tube. However, for the heat transfer outside the tube, the traditional shell‐and‐tube heat exchanger has a low heat transfer effect for hydrate‐industrial devices.…”

Section: Theoritical Detailsmentioning

confidence: 99%

Modelling and experimental study of hydrate formation kinetics of natural gas‐water‐surfactant system in a multi‐tube bubble column reactor

Xin

Zhang

et al. 2019

Can J Chem Eng

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To promote the heat and mass transfer during the hydrate formation process, an internal spiral-grooved tube (ISGT) was proposed as the reaction tube in a large-scale multi-tube bubble column reactor with external slurry circulation. In order to investigate such multi-component gas (natural gas)-water-surfactant systems during the hydrate formation process in the ISGT, based on the solute permeation model and Kolmogorov isotropic turbulence theory, a CFD method combined with the population balance model (PBM) was utilized to simulate gas-liquid mass transfer coefficient. Then, the hydrate formation kinetics model in ISGT was modelled based on the model proposed by Kashchiev and Firoozabadi. The hydrate formation experiments were carried out in the multi-tube bubble column reactor at six different pressure-temperature-circulating flow velocities of piston pump regimes to investigate the actual formation process of natural gas hydrate. The experimental results were then used to finetune the optimized parameters to facilitate accurate model predictions.

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Numerical investigations of circular tube fitted with helical screw-tape inserts from the viewpoint of field synergy principle

Cited by 52 publications

References 20 publications

Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al 2 O 3 -water nanofluid

Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al 2 O 3 -water nanofluid

Numerical study on heat transfer and nanofluid flow in pipes fitted with different dimpled spiral center plate

Modelling and experimental study of hydrate formation kinetics of natural gas‐water‐surfactant system in a multi‐tube bubble column reactor

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