Three-dimensional numerical study of wavy fin-and-tube heat exchangers and field synergy principle analysis

Tao, Yu; He, Yun; Huang, Jun; Wu, Zhengwang; Tao, Wen‐Quan

doi:10.1016/j.ijheatmasstransfer.2006.03.019

Cited by 85 publications

(15 citation statements)

References 18 publications

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“…To the author best knowledge, the literature lacks accurate theoretical investigations that characterize the heat transfer enhancements inside wavy fins but it is rich with experimental evidences supporting this topic (Wang et al, 1999;Ma et al, 2009;Dong et al, 2013;Tao et al, 2007a, b;Junqi et al, 2007;Du et al, 2014;Lorenzini et al, 2007;Pirompugd et al, 2006;Goldstein et al, 2010a, b;Pirompugd et al, 2008;Wiksten and Assad, 2010;Tsai et al, 1999;Tao et al, 2007b). For example, Pirompugd et al (2008) considered that the fin efficiency of the wavy fin is the same as the fin efficiency of the typical circular fin.…”

Section: Thermal Performancementioning

confidence: 99%

Thermal performance of six different types of wavy-fins

Khaled

2015

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -Heat transfer inside wavy fins is analyzed in this work. The paper aim to discuss this issue. Design/methodology/approach -Six different types of wavy fins are considered. The fin equation for each fin type is solved using a high accurate finite difference method. Excellent agreement is obtained between the numerical solution under zero wave amplitude and the exact solution of the plain fin. Findings -The following wavy fin types and conditions are found to produce larger heat transfer rate and its volumetric value than those for the plain fin and other wavy fins: short fins with parallel wavy profiles and large surface-wave frequency; long fins with symmetric wavy surface around the length axis, positive cross-sectional area gradient at the base, and large surface-wave frequency; and long fins with symmetric wavy profiles around the length axis, positive cross-sectional area gradient at the base, and small surface-wave frequency.Research limitations/implications -In addition, both fins with symmetric wavy surface around the width axis and parallel wavy surfaces along the width axis have same performance indicators. Also, these wavy fins possess higher fin efficiency than either that of the plain fin or those of the other types of wavy fins. Originality/value -Finally, heat transfer enhancements in the studied wavy fins are increased by increases in the excess of the surface area, cross-sectional area gradient at the base, arc length and arc width relative to those of the plain fin. NomenclatureA c fin cross-sectional area (m 2 ) A c, b fin cross-sectional area at the base (m 2 ) A s fin surface area (m 2 ) a L fin profile aspect ratio (a L ¼ H o /L) a W o fin cross-section aspect ratio a W o ¼ H o =W o À Á H o fin base half height (m) H fin half height (m) H o fin base half height (m) H fin dimensionless height H ¼ H =H o À Á h fin convective heat transfer coefficient (W m À 2 K À 1 ) i location of the discretized point in the numerical domain k fin thermal conductivity (W m À 1 K À 1 ) L fin length displacement (m) L l wavy fin fin total arc length (m) l fin center-line axis if it is wavy (m) l dimensionless fin center-line axis if it is wavy l ¼ l=L À Á M total number of discretized points in the domain m fin index (m À 1 ) n number of surface waves per fin surface q f fin heat transfer rate per unit volume (W m À 3 ) q 000 f fin heat transfer rate (W) T f fin temperature (K) T b fin base temperature (K) T ∞ fin free stream temperature (K) W fin width (m)

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Section: Thermal Performancementioning

confidence: 99%

Thermal performance of six different types of wavy-fins

Khaled

2015

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…The numerical simulation results implied that with the increase of the wave angles, decrease of the fin pitch, and decrease of the tube row number, the heat transfer of the finned tube bank enhances, but with some penalty in pressure drop (Tao et al, 2007). Two-and three-dimensional numerical simulations have been performed on rectangular wavy-plate-fin cores to determine the velocity and temperature distributions, the j factor and the isothermal f factor in the range of low Reynolds number (10-1000), wall-corrugation severity (0.125-0.5), and fin spacing (0.1-3) (Zhang et al, 2004;Manglik et al, 2005).…”

Section: Introductionmentioning

confidence: 96%

3D-CFD simulation and neural network model for the j and f factors of the wavy fin-and-flat tube heat exchangers

Khoshvaght-Aliabadi

Samani

Hormozi

et al. 2011

Braz. J. Chem. Eng.

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A three dimensional (3D) computational fluid dynamics (CFD) simulation and a neural network model are presented to estimate the behaviors of the Colburn factor (j) and the Fanning friction factor (f) for wavy fin - and - flat tube (WFFT) heat exchangers. Effects of the five geometrical factors of fin pitch, fin height, fin length, fin thickness, and wavy amplitude are investigated over a wide range of Reynolds number (600

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“…The previous studies show that the performance can be influenced by many factors like tube diameter size, pitch in transverse and longitudinal direction, thickness of fin, material of fin, fin geometry, etc. the tube bank with fins has been investigated by [1,2]. And this investigation carried out on the outer fluid only and different pitch sizes.…”

Section: Introductionmentioning

confidence: 99%

Comparative Three Dimensional CFD Study for Inline Cross Flow Plate Finned Tube Heat Exchanger

Ismail¹,

Hassab²,

El‐Maghlany³

2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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In this paper, three dimensional study has been investigated on finned-tubes cross flow heat exchanger. The investigation takes into account the outer cold fluid flow (air). The inner hot fluid flow (water) and the conjugated solid domain. The hot water flowing inside the tube is considered laminar while the air flowing outside the tubes inside the fin passages is treated as turbulent. All heat transfer and fluid flow parameters have been studied at different velocities for air in the range between 1-to-6 m/s with fixed Re =1200 for inner water flow. In this study, the heat transfer coefficients and pressure drops on both sides of fluids are calculated numerically for both the conventional size and the selected micro size heat exchangers with plain-tube and finned-tubes arrangements. The results declare that the micro tube has higher performance with controllable pressure drop as the heat flux ratio is increased by 20% whereas, the heat per unit volume ratio is increased by 800-1200% with the increase of air velocity from the given lower to the higher one. It is found that the effects of using fins are profitable only for the conventional exchanger but not for the micro size exchanger. The most interesting results obtained from this study is the superiority of the micro tube heat exchangers over the typically conventional one in regards of the heat transfer rate per unit volume.

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Three-dimensional numerical study of wavy fin-and-tube heat exchangers and field synergy principle analysis

Cited by 85 publications

References 18 publications

Thermal performance of six different types of wavy-fins

Thermal performance of six different types of wavy-fins

3D-CFD simulation and neural network model for the j and f factors of the wavy fin-and-flat tube heat exchangers

Comparative Three Dimensional CFD Study for Inline Cross Flow Plate Finned Tube Heat Exchanger

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