Comprehensive Study of Heat Exchangers with Louvered Fins

Erbay, L. Berrin; Doğan, Bahadır; Öztürk, M. Mete

doi:10.5772/66472

Cited by 9 publications

(3 citation statements)

References 26 publications

(47 reference statements)

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“…To choose the pertinent angle of inclination, it is necessary to evaluate the hydro-thermal performance index. This index is defined as the ratio between the Colburn factor j and the friction factor f: j/f 1/3 [23]. Figure 12 shows the performance index with independent parameters.…”

Section: Angle Jmentioning

confidence: 99%

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Minh

Thao

2021

CFDL

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Proper determination of inclination angle of a flat tube may increase the overall heat transfer performance without extending heat transfer surface. In this paper, the inclined flat tube heat exchanger with plain fins is numerically investigated. The influence of flat tube inclination angle and Reynolds number on the thermo-hydraulic performance index was evaluated. Tube pitch, fin spacing and flat tube size are fixed. Solving 3D computational domain with the symmetric boundary condition is used to reduce computation time. The results show that when increasing the inclination angle of the flat tube from 0 to 45°, both heat transfer and pressure loss increase because the free area of air flow decreases leading to an increase in air velocity and impingement heat transfer. The variation of inclination angle from 0 to 15°, the increase in heat transfer is stronger than the increase in the pressure loss penalty, so the performance index reaches a maximum of 0.405 at the angle of 15°. Contours of temperature, pressure and velocity at different inclination angles are presented to clarify the thermo-hydraulic characteristics of finned-tube heat exchangers using inclined flat tubes. The current work yields heat transfer enhancement ability by adjusting inclination angle of a heat transfer flat tube.

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Section: Angle Jmentioning

confidence: 99%

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Minh

Thao

2021

CFDL

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“…The air-cooled compact heat exchangers with louver fin are extensively used in vehicles radiators since it is the most efficient and advanced heat transfer fin surface [ [1] , [2] , [3] , [4] ]. The heat transfer between the louver fin surface and the air is what drives the predominant heat transfer by interrupting or breaking up the flow of air and creating thin boundary layers, which lowers the thermal resistivity and increases the heat dissipation [ [5] , [6] , [7] , [8] ].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of louver edges effect on the performances of louvered fin compact heat exchanger

Feleke,

Getie,

Minale

2024

Heliyon

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“…Looking at the historical development of the heat exchanger, surface density has been increased gradually by the time and therefore, the compact heat exchangers are emerged and gain importance among the heating and cooling systems. The surface density or compactness of the heat exchangers is increased by using varying types of extended surfaces such as plain, louvered, strip, wavy, and perforated fin [1,2]. These fin types also increase the heat transfer performance of the compact heat exchangers by breaking the boundary layer formed on the air-side [3,4].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of heat transfer and pressure drop characteristics in an offset strip fin heat exchanger

Doğan

Öztürk

Erbay

2021

Journal of Thermal Engineering

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This paper presents a numerical simulation to determine the air-side heat transfer and the pressure drop characteristics of a flat tube heat exchanger with offset strip fin. The effects of the fin bending ratio such as 29%, 36%, 44%, 50%, and the fin spacing such as 2.10 mm, 2.35 mm, 2.60 mm on the performance of the heat exchanger are studied by using a commercial CFD software. The air having constant viscosity, thermal conductivity, and density enters the heat exchanger at 298 K and the wall temperature of the strip fins is considered as constant at 314 K. Variations of the heat transfer coefficient and the pressure drop in the airside are presented with respect to the frontal air velocity while Colburn j-factor and the friction factor f are presented with respect to the airside Reynolds number ranging from 200 to 1200. Finally, the thermal-hydraulic performance of all investigated cases is compared by using the volume goodness factor, j/f 1/3 . The results show that the air-side heat transfer coefficient and the pressure drop increase when the frontal air velocity ascends. The air-side heat transfer coefficient decreases with the increase of fin spacing. The fin bending ratio does not have a significant effect on the pressure drop in the considered fin spacing. Both the Colburn j-factor and friction factor reduce with the increment of Reynolds number and fin spacing.

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Comprehensive Study of Heat Exchangers with Louvered Fins

Cited by 9 publications

References 26 publications

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Numerical investigation of louver edges effect on the performances of louvered fin compact heat exchanger

Numerical investigation of heat transfer and pressure drop characteristics in an offset strip fin heat exchanger

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