Heat transfer and pressure drop for twisted oval tube bundles with staggered layout in crossflow of air

Li, Xiuzhen; Zhu, Dongsheng; Sun, Jianpeng; Mo, Xun; Liu, Shijie

doi:10.1016/j.applthermaleng.2018.11.124

Cited by 21 publications

(2 citation statements)

References 37 publications

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“…Both passive and active techniques are used to heat transfer enhancement. Passive methods include twisted tube bundles [6], tubes with spiral grooves [7], tubes with spiral finning [8], tube bundles with different diameters [9], etc. The active method includes the application of an electromagnetic field [10], vibration [11], or rotation [12] of the heat exchange surface, etc.…”

Section: Introductionmentioning

confidence: 99%

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

et al. 2022

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The pulsating flow is one of the techniques that can enhance heat transfer, therefore leading to energy saving in tubular heat exchangers. This paper investigated the heat transfer and flow characteristics in a two-dimensional in-line tube bundle with the pulsating flow by a numerical method using the Ansys Fluent. Numerical simulation was performed for the Reynolds number Re = 500 with different frequencies and amplitude of pulsation. Heat transfer enhancement was estimated from the central tube of the tube bundle. Pulsation velocity had an asymmetrical character with a reciprocating flow. The technique developed by the authors to obtain asymmetric pulsations was used. This technique allows simulating an asymmetric flow in heat exchangers equipped with a pulsation generation system. Increase in both the amplitude and the frequency of the pulsations had a significant effect on the heat transfer enhancement. Heat transfer enhancement is mainly observed in the front and back of the cylinder. At a steady flow in these areas, heat transfer is minimal due to the weak circulation of the flow. The increase in heat transfer in the front and back of the cylinder is associated with increased velocity and additional flow mixing in these areas. The maximum increase in the Nusselt number averaged over space and time in the entire studied range was 106%, at a pulsation frequency of 0.5 Hz and pulsation amplitude of 4.5. A minimum enhancement of 25% was observed at a frequency of 0.166 Hz and amplitude of 1.25.

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Section: Introductionmentioning

confidence: 99%

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

et al. 2022

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“…Hu et al [30] simulated the thermal attributes of airflow across finned CCT bank with/without winglet vortex generator of three different configurations. Li et al [31] conducted practical tests using staggered twisted oval shape instead of CCTs as a tube bundle. Deng et al [32] presented simulations for the particles flow and velocity patterns when flowing across staggered bundle of CCTs in moving bed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

A.Alghrubah,

.A. Abd Elrahman,

.R. Salem

et al. 2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Staggered cross flow heat exchangers are commonly employed as air coolers and steam generators. This study aims to boost their thermal performance by proposing a modification to the tube geometry; semicircular tube (SCT) instead of complete circular tube (CCT). Through the runs, numerous gaps between SCTs-bases with different pitches in both longitudinal/transversal directions are tested. The runs are performed with moving cooling water through the tubes while heating air flows across the tube bundles. The results state that the SCT can be used as a passive approach for augmenting the heat exchange rates. As geometry, increasing the gap between their bases increases both the heat exchange rate and fluid pressure loss at the same time. Additionally, reducing the longitudinal and/or transversal pitch ratios leads to enlarging these increases. In addition, the thermal performance index (TPI) is slightly augmented by extending the distance between the SCTs' bases or reducing the transversal and/or longitudinal spacings. Also, an increase in the TPI is resulted by raising the airflow rate. Moreover, the extreme determined TPI is 1.98.

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Experimental investigation of the hydrothermal aspects of water–Fe3O4 nanofluid inside a twisted tube

Niknejadi

Afrand

Karimipour

et al. 2020

J Therm Anal Calorim

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Heat transfer and pressure drop for twisted oval tube bundles with staggered layout in crossflow of air

Cited by 21 publications

References 37 publications

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

Experimental investigation of the hydrothermal aspects of water–Fe3O4 nanofluid inside a twisted tube

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