Impact of delta winglet vortex generators on the performance of a novel fin-tube surfaces with two rows of tubes in different diameters

Wu, Jiangbo; Tao, Wen‐Quan

doi:10.1016/j.enconman.2011.03.002

Cited by 59 publications

(18 citation statements)

References 14 publications

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“…It is noticed that for the same heat transfer area using di fferent diameter of tube in the succes sive row y ields better performance over the sam e diameter tube. A m ultiple correlations of friction factor and Nusselt num ber for large tube diameter an d large number of rows have been proposed by Wu and Tao at el [10], ], it is noticed that for the same heat transfer area using different diameter of tube in the succ essive row yields better performance over the sa me diameter tube. A multiple correlations of friction factor and Nusselt number for large tube diameter and large number of rows have been proposed by Xie at el [11].…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical Investigation of Finned-tube Heat Exchanger with Circular, Elliptical & Rectangular Tubes

Hasan

Mondal

2020

1790-5044

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A three dimensional numerical study has been conducted on fi nned-tube heat exchanger with multiple rows of tubes using ANSYS (Fluent). The objective of this study is to numerically investigate finned tube heat exchanger with different ty pe of tubes such as circular, elliptical an d rectangular tubes. As circular tubes has much pressure drop so elli ptical and recta ngular tubes has been introduced i n order to re duce pressure drop. As well as heat transfer has also been examined. The finite volume bas ed CFD code ANS YS Fluent 16.2 is used to calculate the flow and temperature fields and by applying SIMPLEC algorithm. At low velocity of air and water, nothin g significant occurred for the co mbination of tubes. At high velocit y in maximum tube combination there was heat transfe r (HT) enhance ment and pressure drop reduction when compared with circular tubes only in case of air. When the combinations of circular, elliptical and rectangular tubes has been compared with circular tube heat exchanger (CTHX) heat transfer reduces as well as pressure drop (PD) also reduces for air. In case of water vapor HT and PD behaves the same. When those combinations has been compared with elliptical tube HX, for air in some cases heat transfer remains same and on other case it increases. For pressure drop in case of air, in some cases it reduces and on other cases it reduces. For elliptical tube HX for the fluid water vapor HT and PD both remains same or reduces. This work has not been with conducted any numerical simulation on rectangular Heat exchanger reason behind i t there isn't an y existence of this kind of h eat exchanger. However, it could be nu merically conducted to examine the results between those combination and rectangular heat exchanger.

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Section: Literature Reviewmentioning

confidence: 99%

Numerical Investigation of Finned-tube Heat Exchanger with Circular, Elliptical & Rectangular Tubes

Hasan

Mondal

2020

1790-5044

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“…Lemouedda et al [88] DWPs in a finned circular-tube heat exchanger. [89] DWPs in a novel finned circular-tube heat exchanger.…”

Section: -12200mentioning

confidence: 99%

A Review of Airside Heat Transfer Augmentation with Vortex Generators on Heat Transfer Surface

Chai

Tassou

2018

Energies

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Heat exchanger performance can be improved via the introduction of vortex generators to the airside surface, based on the mechanism that the generated longitudinal vortices can disrupt the boundary layer growth, increase the turbulence intensity and produce secondary fluid flows over the heat transfer surfaces. The key objective of this paper is to provide a critical overview of published works relevant to such heat transfer surfaces. Different types of vortex generator are presented, and key experimental techniques and numerical methodologies are summarized. Flow phenomena associated with vortex generators embedded, attached, punched or mounted on heat transfer surfaces are investigated, and the thermohydraulic performance (heat transfer and pressure drop) of four different heat exchangers (flat plate, finned circular-tube, finned flat-tube and finned oval-tube) with various vortex-generator geometries, is discussed for different operating conditions. Furthermore, the thermohydraulic performance of heat transfer surfaces with recently proposed vortex generators is outlined and suggestions on using vortex generators for airside heat transfer augmentation are presented. In general, the airside heat transfer surface performance can be substantially enhanced by vortex generators, but their impact can also be significantly influenced by many parameters, such as Reynolds number, tube geometry (shape, diameter, pitch, inline/staggered configuration), fin type (plane/wavy/composite, with or without punched holes), and vortex-generator geometry (shape, length, height, pitch, attack angle, aspect ratio, and configuration). The finned flat-tube and finned oval-tube heat exchangers with recently proposed vortex generators usually show better thermohydraulic performance than finned circular tube heat exchangers. Current heat exchanger optimization approaches are usually based on the thermohydraulic performance alone. However, to ensure quick returns on investment, heat exchangers with complex geometries and surface vortex generators, should be optimized using cost-based objective functions that consider the thermohydraulic performance alongside capital cost, running cost of the system as well as safety and compliance with relevant international standards for different applications.

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“…Tian et al [14] compared the thermal performance between the winglet pairs arranged in both CFU and CFD configurations and fond that the increment of Nu of CFU is higher than that of CFD. Wu and Tao [15] also numerically studied a two-row tube-fin heat exchanger with the VGs arranged in pairs in a common flow up (CFU) or common flow down (CFD) configuration. The results showed that better heat transfer performance and lower pressure loss can be obtained by the optimization of the VG location, size and attack angle.…”

Section: Introductionmentioning

confidence: 99%

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

2020

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The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively.

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Impact of delta winglet vortex generators on the performance of a novel fin-tube surfaces with two rows of tubes in different diameters

Cited by 59 publications

References 14 publications

Numerical Investigation of Finned-tube Heat Exchanger with Circular, Elliptical & Rectangular Tubes

Numerical Investigation of Finned-tube Heat Exchanger with Circular, Elliptical & Rectangular Tubes

A Review of Airside Heat Transfer Augmentation with Vortex Generators on Heat Transfer Surface

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

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