Thermal enhancement in a solar air heater channel using rectangular winglet vortex generators

Depaiwa, Nattawoot; Chompookham, Teerapat; Promvonge, Pongjet

doi:10.1109/esd.2010.5598864

Cited by 27 publications

(12 citation statements)

References 8 publications

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“…Depaiwa et al [8] investigated the solar air heater channel with ten pairs of rectangular winglet vortex generators (RWVG) placed on the inlet region, and the influences of the flow attack angle, α=30 o -60 o with pointing upstream (PU) and pointing downstream (PD) for Re = 5000 -23,000 were reported. They concluded that the highest flow attack angle lead to the highest heat transfer rate and friction loss.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Turbulent forced convection in a heat exchanger square channel with wavy-ribs vortex generator

Boonloi

Jedsadaratanachai

2015

Chinese Journal of Chemical Engineering

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Section: Accepted Manuscriptmentioning

confidence: 99%

Turbulent forced convection in a heat exchanger square channel with wavy-ribs vortex generator

Boonloi

Jedsadaratanachai

2015

Chinese Journal of Chemical Engineering

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“…For the same area of LVGs, the increase in the length of the LVGs brings more heat transfer enhancement than increasing the height. Depaiwa et al [7] and Promvonge et al [8] found that the larger attack angle leads to higher heat transfer rate and flow loss than the lower one. Althaher et al [9] indicated that the Nu number and friction factor are relatively proportional to the size, number, and the inclination angle of the DWP of VG.…”

Section: Introductionmentioning

confidence: 97%

Experimental study of heat transfer augmentation in non-circular duct using combined nanofluids and vortex generator

Ahmed

Musse

Yusoff

et al. 2015

International Journal of Heat and Mass Transfer

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“…Some typical examples are heat transfer surfaces mounted with louvred fin, offset fin, offset strip fin, rectangular plate-fin, and vortex generators (VGs) such as fins, ribs and wings. Their mechanisms for heat transfer augmentation are usually to disrupt the boundary layer growth, to increase the turbulence intensity, and to generate secondary flows such as swirl or vortices [5][6][7].…”

Section: Introductionmentioning

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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Thermal enhancement in a solar air heater channel using rectangular winglet vortex generators

Cited by 27 publications

References 8 publications

Turbulent forced convection in a heat exchanger square channel with wavy-ribs vortex generator

Turbulent forced convection in a heat exchanger square channel with wavy-ribs vortex generator

Experimental study of heat transfer augmentation in non-circular duct using combined nanofluids and vortex generator

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

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