NT Vortex enhancement of heat transfer and flow in the narrow channel with a dense packing of inclined one-row oval-trench dimples

Исаев, С. А.; Gritckevich, Mikhail; Leontiev, A. I.; Мильман, О. О.; Никущенко, Д. В.

doi:10.1016/j.ijheatmasstransfer.2019.118737

Cited by 35 publications

(14 citation statements)

References 49 publications

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“…Thus, the respective thermal-hydraulic efficiency coefficient E = 1.1 could be achieved. The results presented in [11][12][13][14][15][16][17][18][19][20] shall be verified experimentally. The numerical results presented by Isaev S. A. et al [18] were obtained for the periodic duct section with the row of inclined to the main flow oval-trench dimples.…”

Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 89%

“…The results presented in [11][12][13][14][15][16][17][18][19][20] shall be verified experimentally. Experimental studies on friction factor and heat transfer in ducts with the dimpled surfaces where the dimples had oval or oval-trench shape were carried out in a limited number of works by Burtsev, Energies 2020, 13, 5243 6 of 15 S.A., et al [21], Voskoboynik, A.V., et al [22], Voropaev, G.A., et al [23], Sergievsky, E.D., et al [24] and Popov, I.A., et al [25].…”

Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 89%

“…A more thorough investigation of the influence of the relative periodic section length on thermohydraulic properties of the airflow in the plain-parallel duct was presented in [20].…”

Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 99%

“…The comparison of the outlined values was carried out with the results of the numerical simulation [20] for similar flow and geometrical parameters (recalculating the Reynolds number values Re = ρVd e /µ). A good data value agreement was observed.…”

Section: Verification and Recommendationmentioning

confidence: 99%

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Numerical and Physical Simulation of Heat Transfer Enhancement Using Oval Dimple Vortex Generators—Review and Recommendations

et al. 2020

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Vortex generation and flow disruption in heat exchanger passages by means of surface modification is a widely used passive heat transfer augmentation technique. The present paper contains the results of numerical and experimental studies of the hydraulic resistance and heat transfer in the rectangle duct with oval-trench- and oval-arc-shaped dimples applied to the heat transfer surface. For the turbulent flow in the duct (Pr = 0.71, Red = 3200–9 × 104—for heat transfer determination and Red = 500–104—for the friction factor measurements), rational geometrical parameters of the oval-trench dimple were determined: relative elongation of dimple l/b = 5.57–6.78 and relative depth l/b = 5.57–6.78, while the value of the attack angle to the mean flow was fixed φ = (45–60)°. The comparison of the experimental and numerical modeling for the flow in the narrow duct over the surface with a single- and multi-row dimple arrangement has revealed a good agreement. It was found that the average heat transfer coefficient magnitudes in such ducts could be increased 1.5–2.5 times by means of single and multi-row dimple application on the heat transfer surface. The heat transfer augmentation for the surfaces with the oval-arched dimples was found to be 10% greater than the one for the oval-trench dimples. The corresponding friction factor augmentation was found to be 125–300% in comparison to the smooth surface duct. The obtained experimental data were used for the data generalization. Derived generalized equation allows for predicting the friction factor and heat transfer coefficient values for the flow over the single-row oval-trench simple arrangement. The maximal deviation of the experimental data from the proposed equations was found to be 20%. The application of the artificial neural networks for predicting the hydraulic resistance and heat transfer augmentation in such ducts was presented.

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Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 89%

Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 89%

“…A more thorough investigation of the influence of the relative periodic section length on thermohydraulic properties of the airflow in the plain-parallel duct was presented in [20].…”

Section: Review Of Numerical Simulation Of Heat Transfer Enhancement Using Elongated Oval Dimplesmentioning

confidence: 99%

Section: Verification and Recommendationmentioning

confidence: 99%

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Numerical and Physical Simulation of Heat Transfer Enhancement Using Oval Dimple Vortex Generators—Review and Recommendations

et al. 2020

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“…При наклоне под углом 45 • увеличение длины уединенной овально-траншейной лунки (ОТЛ) на стенке узкого канала при условии постоянства площади пятна и глубины приводит к интенсификации вихревого течения в лунке и снижению гидравлических потерь [8]. В [9,10] открыто явление аномальной интенсификации отрывного течения в наклонных однорядных ОТЛ в узком канале на стабилизированном гидродинамическом участке. нат x, y, z вводится с центром в середине нижней грани входного сечения облуненной секции канала (рис.…”

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Влияние На Аномальную Интенсификацию Отрывного Турбулентного Течения Угла Наклона Однорядных Овально-Траншейных Лунок На Стабилизированном Гидродинамическом Участке Узкого Канала

Исаев¹,

Мазо²,

Никущенко³

et al. 2020

Письма В Журнал Технической Физики

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The slope of the oval-trench dimple in the corridor package on the hydrodynamic stabilized section of the narrow channel has a dramatic effect on the anomalous intensification of returned and swirling flows in the dimple, leading to a 3–4-fold decrease in relative negative friction in the range of angles from 40° to 60°, an increase in the highest speed return and secondary flows up to 0.8 and 1.18 with respect to the mass-average flow velocity in the channel.

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Numerical study on hot spot minimization and heat transfer enhancement of narrow rectangular channel with slit elliptic dimples

Wang,

Sun,

et al. 2023

Heat Mass Transfer

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NT Vortex enhancement of heat transfer and flow in the narrow channel with a dense packing of inclined one-row oval-trench dimples

Cited by 35 publications

References 49 publications

Numerical and Physical Simulation of Heat Transfer Enhancement Using Oval Dimple Vortex Generators—Review and Recommendations

Numerical and Physical Simulation of Heat Transfer Enhancement Using Oval Dimple Vortex Generators—Review and Recommendations

Numerical study on hot spot minimization and heat transfer enhancement of narrow rectangular channel with slit elliptic dimples

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