Heat transfer characteristics of a circular tube bank fin heat exchanger with fins punched curve rectangular vortex generators in the wake regions of the tubes

Gong, Bao; Wang, Liang-Bi; Lin, Zhihong

doi:10.1016/j.applthermaleng.2014.09.043

Cited by 86 publications

(28 citation statements)

References 37 publications

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“…Du et al [19] numerically studied the flow structure and heat transfer enhancement of LVGs applied in direct air e cooled condenser using RNG keε model and found that the delta winglet pair with attack angle of 25 could reach the optimum thermal and flow performances. Gong et al [20] fitted curved rectangular vortex generators in the wake regions of a fin e tube exchanger and found that the heat transfer performance was significantly improved.…”

Section: Introductionmentioning

confidence: 98%

Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

Zhou

2016

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 98%

Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

Zhou

2016

International Journal of Thermal Sciences

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“…Alongside the four main types, several other VGs have been proposed and investigated in recent years. Wang et al [6,9], Lin et al [15] and Gong et al [16] proposed annular winglets and wave-element VGs, as shown in Figure 2a, particularly for application to finned-tube heat exchangers. He et al [17] proposed V-deployed VG arrays, as shown in Figure 2b, to emulate locomotion of animals in nature.…”

Section: Vortex Generatorsmentioning

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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“…The result was that the EWVGs with 1.5 mm length were more effective than plain fins . In addition, some newly designed VGs, for example, curve rectangular VGs, curve delta WVGs, and perforated WVGs, were investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on heat transfer and flow characteristics in an alternating cross‐section flattened tube

Rukruang

Chimres

Kaew-On

2018

Heat Trans. Asian Res.

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An experimental and numerical study on convection heat transfer of water flowing through an alternating cross-section flattened (ACF) tube are investigated in this paper. The thermal-fluid characteristics were evaluated by numerical simulation. The test run conditions covered a mass flux of 200 to 800 kg m −2 s −1 , a heat flux of 10 kW/m 2 , and an inlettemperature of 40°C. The results showed that the Nusselt number increased with the increase in mass flux. Moreover, the heat transfer was also affected by the flow characteristics. Vortices were formed at the curved wall, and their intensities were increased along the flow direction. It was also found that the heat transfer and pressure drop were larger than that of the circular tube. However, the thermal performance was greater than the pressure loss penalty.The comparison results showed that the ACF tube had better performance than the circular tube. Further, the details of heat transfer, flow resistance, and fluid behavior were investigated and discussed in this study. K E Y W O R D S alternating flattened (AF) tube, computational fluid dynamics (CFD), flow characteristics, heat transfer enhancement, vortex generation Heat Transfer-Asian Res. 2019;48:817-834.wileyonlinelibrary.com/journal/htj

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Heat transfer characteristics of a circular tube bank fin heat exchanger with fins punched curve rectangular vortex generators in the wake regions of the tubes

Cited by 86 publications

References 37 publications

Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

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

Experimental and numerical study on heat transfer and flow characteristics in an alternating cross‐section flattened tube

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