Flow structure between the tubes and heat transfer of a tube bundle in pulsating flow

Молочников, В. М.; Mikheev, А. N.; Aslaev, A. K.; Goltsman, A. E.; Paereliy, A. A.

doi:10.1088/1742-6596/1105/1/012024

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…The temperature difference ∆t was found according to Equation ( 24), averaged over time ∆t according to Equation (25).…”

Section: Methodology For Evaluating Results Of Simulationmentioning

confidence: 99%

“…The authors associated the increase in heat transfer with the disturbing flow structure at the back of the cylinder. The authors determined [24,25] the flow and heat transfer characteristics of in-line and staggered tube bundles at symmetric air pulsations. Flow pulsations lead to an increase in heat transfer due to the disturbing vortex flow structures in the annular space of the tube bundles.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The temperature difference ∆t was found according to Equation ( 24), averaged over time ∆t according to Equation (25).…”

Section: Methodology For Evaluating Results Of Simulationmentioning

confidence: 99%

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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“…λ, λturb in equations ( 20)-( 23) was defined similarly to equations ( 16)- (19). The temperature difference ∆t was found according to equation ( 24), averaged over time 〈∆t〉 according to equation (25).…”

Section: Methodology For Evaluating Results Of Simulationmentioning

confidence: 99%

“…The authors associate the increase in heat transfer with the disturbing flow structure in the back of the cylinder. The authors are determined [24,25] the flow and heat transfer characteristics of in-line and staggered tube bundles at symmetric air pulsations. Flow pulsations lead to an increase in heat transfer due to the disturbing vortex flow structures in the annular space of the tube bundles.…”

Section: Introductionmentioning

confidence: 99%

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

Haibullina¹,

Hayrullin²,

Balzamov³

et al. 2022

Preprint

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The pulsating flow is one of the techniques which can enhance heat transfer, therefore leading to energy saving in tubular heat exchangers. This paper investigates 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 is performed for 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 has a significant effect on 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.

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“…Интенсификация теплообмена наблюдается при принудительных пульсациях потока в трубе [8], при обтекании полуцилиндра [9,10], и других препятствий [11,12]. Не смотря на имеющиеся положительные результаты в применении пульсирующих потоков для интенсификации теплообмена в пучках труб для потоков воздуха [13], воды [14] и масла [15], экспериментальных и теоретических исследований их влияния на очистку внешней поверхности труб в пучке в настоящее время недостаточно [16][17][18]. Поэтому в данной работы было исследование влияния пульсационного потока на эффекты, способствующие удалению отложений на внешней поверхности пучков труб, а также предложено практическое решение для реализация пульсационного метода очистки маслоохладителей.…”

Section: Introductionunclassified

Improving heat exchanger efficiency using the pulsed method of cleaning

Haibullina

Zinnatullin

Ilyin

2020

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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The fouling of heat exchange equipment leads to serious economic losses in many industries, therefore to find a method to reduce deposits on heat transfer surfaces remains an actual task. In this paper, a practical solution is proposed for the implementation of a pulsating cleaning method of oil coolers as an example. The influence of pulsations on cleaning of the external surface of the heat exchanger is studied by computer modeling with Ansys Fluent. The fluid flow was described by the Navier-Stokes equation, particle motion and their interaction was described by the discrete element method (DEM). In the study, a staggered tube bundle was considered. The pulse frequency 0,3125 Hz, the amplitude referred to the diameter of tube is 35, the Reynolds number 100, the duty cycle of the pulsations 0,25. Oil was chosen as the medium. Evaluation of the pulsating cleaning method was carried out on the basis of the analysis of the mechanics of particle collisions on the surface of the central cylinder in the beam, with stationary and pulsating flow. It was found that the pulsating flow helps to reduce deposits in the front of the cylinder and is not effective in the back. An analysis of the mechanics of particle impact on the heat exchange surface showed that this pulsation mode is more effective for removing plastic deposits.

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Flow structure between the tubes and heat transfer of a tube bundle in pulsating flow

Cited by 5 publications

References 11 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

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

Improving heat exchanger efficiency using the pulsed method of cleaning

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