Numerical Investigation of the Air-Side Thermal Hydraulic Performance of a Louvered-Fin and Flat-Tube Heat Exchanger at Low Reynolds Numbers

Erbay, L. Berrin; Uğurlubilek, Nihal; Altun, Özge; Doğan, Bahadır

doi:10.1080/01457632.2016.1200382

Cited by 29 publications

(13 citation statements)

References 32 publications

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“…Heat Exchangers-Advanced Features and Applications the cross section of the louvers and the numerical h c value is used directly without any fin efficiency formula. However, the slopes of the 2D numerical results are comparable and agree with the experimental results, heat transfer coefficient (h c ) is overpredicted with the assumption of constant fin temperature and neglecting the tube surface effect [6,18,19]. It is these factors which led to the development of the 3D models.…”

Section: Performance Evaluation Criteria Of the Louvered Fin Heat Excsupporting

confidence: 65%

“…The variation of the j/f 1/3 ratio has a complicated behaviour with respect to the fin pitch and the fin height. In particular, the low Reynolds number region which has the significant changes of j/f 1/3 ratio for the smaller flow depths can be illuminated with another study by Erbay et al [6] as shown in Figure 23.…”

Section: Heat Exchangers-advanced Features and Applicationsmentioning

confidence: 65%

“…The ratio of the j-factor to the f, the ratio of the j-factor to the f 1/3 and JF are the overall performance criteria of the louvered fin heat exchangers used in the literature. j/f is known as "area goodness factor" [12,13] and j/f 1/3 is known as "volume goodness factor" [6,14,15]. JF number which is related with the volume goodness factor can be obtained by Eq.…”

Section: Performance Evaluation Criteria Of the Louvered Fin Heat Excmentioning

confidence: 99%

“…The j/f 1/3 ratios of the study of Erbay et al [6] are obtained for a constant flow depth of 20 mm by numerically. It seen that the j/f 1/3 ratio for all the geometries has a similar trend with respect to the Reynolds number; however, there is not linear relationship for the geometric parameters.…”

Section: Heat Exchangers-advanced Features and Applicationsmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive Study of Heat Exchangers with Louvered Fins

Erbay¹,

Doğan²,

Öztürk³

2017

Heat Exchangers - Advanced Features and Applications

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The purpose of this chapter is to describe the basic physical features and the analysis of the thermal-hydraulic performance of the louver fins. The terminology which is used widely in the field of compact heat exchanger with louvered fin is described. The flow phenomenon affected by the operating conditions and the geometric parameters of the louvered fin is examined using the flow visualization techniques found in the literature. A methodology is given to calculate the heat transfer and the friction factor. Stanton number, Colburn j-factor and friction factor are defined as a performance criteria and the variations of these criteria with respect to the Reynolds number and the geometric parameters of the louvered fin. The combinations of these dimensionless number such as area goodness factor (j/f), volume goodness factor (j/f 1/3) and JF number related with the volume goodness factor are discussed in terms of overall performance criteria. Finally, the correlations of the louvered fin heat exchanger and their tabulated data was summarized.

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Section: Performance Evaluation Criteria Of the Louvered Fin Heat Excsupporting

confidence: 65%

Section: Heat Exchangers-advanced Features and Applicationsmentioning

confidence: 65%

Section: Performance Evaluation Criteria Of the Louvered Fin Heat Excmentioning

confidence: 99%

Section: Heat Exchangers-advanced Features and Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive Study of Heat Exchangers with Louvered Fins

Erbay¹,

Doğan²,

Öztürk³

2017

Heat Exchangers - Advanced Features and Applications

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“…Extended Surfaces Wavy fin [9,10] Slit fin [11,12] Perforated fin [13,14] Louvered fin [15,16] Modifying the fin pattern and geometry by interrupting it periodically along the streamwise direction. The interrupting and restarting of the boundary layer and creation of secondary flows, which provide better airflow mixing.…”

Section: Passive Techniquesmentioning

confidence: 99%

Development of new finned tube heat exchanger: Innovative tube-bank design and thermohydraulic performance

Lotfi

Sundén

2019

Heat Transfer Engineering

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Three-dimensional numerical simulations are successfully carried out on thermo-hydraulic characteristics of a new plain fin-and-elliptical tube (PFET) heat exchanger with innovative types of tube-banks, namely-a slotted elliptical tube-bank (SETB) (Case B and Case C) and a slotted annular elliptical tube-bank (SAETB) (Case D and Case E). The new PFET heat exchanger contains elliptical cross-sectioned tubes that create narrow slots oriented in the streamwise or/and spanwise direction. The investigation on the effects of different shape tube-banks on the air-side heat transfer and fluid flow characteristics in the new PFET heat exchanger was performed using the ANSYS CFXV R package. The objectives of this investigation are to determine an optimal staggered tube-bank configuration for augmenting heat transfer rates with minimal pressure drop penalties, and compare the results against traditional non-slotted elliptical tube-bank heat exchangers. The averaged heat transfer rate of the SETB/SAETB heat exchanger is more than 15% greater than that of the traditional nonslotted elliptical tube heat exchanger. The overall performance evaluation criteria, estimated in terms of the area goodness factor and volume goodness factor for enhanced cases (SETBs/ SAETBs), were higher than there found by a non-slotted elliptical tube-bank case. Overall, the computational results showed that the Case D causes an appreciable increase of the heat transfer rate without a pressure drop penalty.

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Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Wan

Liu

et al. 2022

Advcd Theory and Sims

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The purpose of this paper is to study the effect of the structural parameters of louvered fin radiators on its thermal‐hydraulic performance, optimize its structural parameters, and improve the performance of louvered fin radiators in negative gauge pressure condition. The thermal calculation model of louvered fin radiator in negative gauge pressure is established. Then, the effects of design variables on thermal‐hydraulic characteristics are investigated. The second generation of nondominated sorting genetic algorithm (NSGA‐II) is applied to optimize the louvered fin heat exchanger in negative gauge pressure environment. Technique for order preference by similarity to an ideal solution is applied to choose the final optimal solution. Numerical simulation of the solution is conducted and the result is compared with literature in order to verify the optimization method. The optimal structural parameters are obtained under constraints. Compared with the original test piece, the heat transfer rate of optimal solution is increased by 7.7%, and total annual cost is reduced by 24.8%. The present paper establishes optimization method of louvered fin radiators in negative gauge pressure condition, the optimization result is superior to the original radiator. The optimization method can be used in the design of radiators operating in negative gauge pressure conditions.

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Numerical Investigation of the Air-Side Thermal Hydraulic Performance of a Louvered-Fin and Flat-Tube Heat Exchanger at Low Reynolds Numbers

Cited by 29 publications

References 32 publications

Comprehensive Study of Heat Exchangers with Louvered Fins

Comprehensive Study of Heat Exchangers with Louvered Fins

Development of new finned tube heat exchanger: Innovative tube-bank design and thermohydraulic performance

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

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