Heat transfer from a cylinder in pulsating cross-flow

Молочников, В. М.; Михеев, Н. И.; Mikheev, А. N.; Paereliy, A. A.

doi:10.1134/s0869864317040084

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…With increasing frequency, the intensity of the vortices behind the cylinder increased. The authors in [22,23] analyzed the formation of vortex structures in the wake of a single cylinder in a pulsating airflow. A relationship between vortex structures with heat exchange was established.…”

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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“…The effective thermal conductivity λeff averaged over the annular region around the cylinder λeff,a, a was determined by equation (20), over space and time 〈λeff,a〉 by equation (21). Local effective thermal conductivity λeff,ϕ and local effective thermal conductivity averaged over time 〈λeff,ϕ〉 according to equations ( 22), (23).…”

Section: Methodology For Evaluating Results Of Simulationmentioning

confidence: 99%

“…With increasing frequency, the intensity of the vortices behind the cylinder increases. The authors [22,23] analyzed the formation of vortex structures in the wake of a single cylinder in a pulsating airflow. A relationship between vortex structures with heat exchange was established.…”

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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“…As methods for increasing the efficiency of heating installations from the inside, one can note a reduction in scale formation in the heating systems of heat exchangers of heating installations [4]; increasing the efficiency of heat exchangers through the use of profile twisted tubes [5]; development of methods for improving the fins of heat exchangers [6]; use of pulsation cleaning methods [7]; the use of a built-in surface cooler in the heat exchange process [8]; increasing the efficiency of heat transfer through the use of a round cylinder in laminar pulsating transverse flows [9][10][11].…”

Section: Methodsmentioning

confidence: 99%

Increasing the efficiency of heating systems through the use of direct contact heat exchange

Ivanov,

Persiyanova

2024

E3S Web Conf.

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Heat transfer from a cylinder in pulsating cross-flow

Cited by 10 publications

References 8 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

Increasing the efficiency of heating systems through the use of direct contact heat exchange

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