The development of active vortex generators from shape memory alloys for the convective cooling of heated surfaces

Aris, Mohd Shiraz; Owen, I.; Sutcliffe, Christopher

doi:10.1016/j.ijheatmasstransfer.2011.03.030

Cited by 32 publications

(14 citation statements)

References 17 publications

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“…Four surface protrusion designs are commonly used for longitudinal-vortex-induced heat transfer enhancement. As shown in Figure 1, they are delta wing, rectangular wing, delta winglet and rectangular winglet [8,12,14]. The geometry parameters of these VGs, such as the angle of attack (α) and aspect ratio (Λ), can have a significant influence on their heat transfer capability, and have thus received increased research attention.…”

Section: Vortex Generatorsmentioning

confidence: 99%

“…The geometry parameters of these VGs, such as the angle of attack (α) and aspect ratio (Λ), can have a significant influence on their heat transfer capability, and have thus received increased research attention. [8,12,14].…”

Section: Vortex Generatorsmentioning

confidence: 99%

“…Of particular note is the novel longitudinal tube fin designs proposed by Stehlík et al [10], shown in Figure 2f, which provides the heat transfer intensification through the increased heat transfer area and the flow turbulence, and could have the applications in heat recovery in power plants, where fin geometry and enhancement can effectively reduce the heat exchanger size and costs. [8,12,14].…”

Section: Vortex Generatorsmentioning

confidence: 99%

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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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Section: Vortex Generatorsmentioning

confidence: 99%

Section: Vortex Generatorsmentioning

confidence: 99%

Section: Vortex Generatorsmentioning

confidence: 99%

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

Chai

Tassou

2018

Energies

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“…The Nusselt number values obtained from combined ribs and WVGs are found to be much higher than those from ribs/WVGs alone. Aris et al 16 conducted an experimental work of transitional airflow to determine heat transfer enhancement and flow pressure losses due to the presence of active delta wing VGs on a heated rectangular channel surface. Both the heat transfer and the pressure loss resulting from this experiment have demonstrated the ability of active VGs as heat transfer enhancers.…”

Section: Vortex Generationmentioning

confidence: 99%

Numerical and experimental investigations of shape and location of vortex generators on fluid flow and heat transfer in a constant heat-fluxed rectangular duct

Al-khishali

Ebaid

2015

Advances in Mechanical Engineering

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A numerical and experimental study was conducted for heat transfer enhancement and fluid flow in a constant heatfluxed rectangular wooden duct fitted with two shapes of vortex generators (circular and square). These vortex generators are of the same area and placed at two different locations (X d = 1 cm and X d = 2 cm) ahead of the heater set and for Reynolds number from 32,000 to 83,000. The numerical and experimental results show an enhancement of heat transfer with the presence of vortex generators. This enhancement depends on the shape and location. Also, the numerical results show saving of 27% of the heater power with the presence of vortex generator. The experimental results of temperature distribution, Nusselt number distribution, effectiveness distribution, and pressure drop values of flow over heaters with vortex generators were reported and compared with the flow over heaters without vortex generators. The results show that heat transfer was enhanced by 2.186%-3.75% using circular type, and it enhanced by 1.3%-1.94% using square type. Also, pressure drop at the outlet of the duct increases by 166.7%-400% when using circular vortex generators and increases by 133.3%-300% when using square vortex generators. These values were obtained for the velocity ranging between 4 and 10 m/s and when vortex generators were placed at location X d = 2 cm. Finally, correlation equations for Nusselt number were obtained at location X d = 2 cm ahead of the heater set.

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“…The heat transfer enhancement method that makes use of vortex generators is known as vortex-induced enhancement technique. The experimental results for inline arrangement of delta wings as per M.S.Aris, Owen, C.J.Sutcliffe, 2011 [5]. for limited configurations are presented here.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Rate of Heat Transfer Using Vortex Generators in Air Heater

Angadi¹,

Katti²

2016

IJRET

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The development of active vortex generators from shape memory alloys for the convective cooling of heated surfaces

Cited by 32 publications

References 17 publications

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

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

Numerical and experimental investigations of shape and location of vortex generators on fluid flow and heat transfer in a constant heat-fluxed rectangular duct

Enhancement of Rate of Heat Transfer Using Vortex Generators in Air Heater

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