Experimental and numerical heat transfer investigation in turbulent square-duct flow through oblique horseshoe baffles

Skullong, Sompol; Thianpong, Chinaruk; Jayranaiwachira, Nuthvipa; Promvonge, Pongjet

doi:10.1016/j.cep.2015.11.008

Cited by 67 publications

(14 citation statements)

References 45 publications

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“…A data acquisition system (Fluke 2680A) was used to receive the signal from the mentioned thermocouples and was recorded by a laptop. More details of the method and uncertainty analysis are similar as reported in earlier paper [23]. …”

Section: Methodsmentioning

confidence: 71%

Turbulent Heat Transfer and Pressure Loss in a Square-Duct Heat Exchanger with Inclined-Baffle Inserts

Koolnapadol¹,

Hoonpong²,

Skullong³

et al. 2017

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Abstract. Thermal and friction loss characteristics in a square-duct heat exchanger fitted with inclinedbaffles are experimentally examined. Air as the test fluid enters the test duct having a uniform surface heatflux. The baffles are placed repeatedly on both sides of a rectangular centre-cleared tape/frame before diagonally inserting the baffled frame into the test duct to produce longitudinal vortex flows through the test section. Effects of five different relative baffle height or flow blockage ratios (b/H=BR=0.1, 0.2, 0.3, 0.4 and 0.5) on heat transfer, pressure loss and thermal performance in the square duct are investigated for Reynolds number ranging from 4100 to 25,600. The relative baffle pitch or pitch ratio (P/H=PR) and baffle attack angle () are fixed at 3.0 and 30°, respectively. The experimental results reveal that the heat transfer and pressure drop in the form of respective Nusselt number (Nu) and friction factor (f) from using the baffle tend to increase with the rise of Reynolds number (Re) and BR. The maximum enhancement in Nu and f has been found to be 4.61 and 63.67 times above the smooth duct, respectively. The thermal enhancement factor () is maximum at BR=0.3.

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Section: Methodsmentioning

confidence: 71%

Turbulent Heat Transfer and Pressure Loss in a Square-Duct Heat Exchanger with Inclined-Baffle Inserts

Koolnapadol¹,

Hoonpong²,

Skullong³

et al. 2017

Self Cite

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“…In this study, baffles have placed in various angles (α= 45°,60°, and 90°) and different numbers (9,13). (1)…”

Section: Problem Descriptionmentioning

confidence: 99%

“…The results showed a high effect of heat transfer performance with diagonal baffles for heat exchanger (shell and tube). Skullong et al, [13] performed a numerical and experimental investigation to study the heat transfer enhancement in a heat exchanger square-duct fitted with 30_ oblique horseshoe baffles (HB). Various geometrical parameters of baffles are applied; air flow and heat transfer behaviors are presented for turbulent flow region, Reynolds number ranging from 4000 to 25,000.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Al-Juhaishi

Fawzi

Mohammad

2020

ARFMTS

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Curved channel is commonly used in cement mill's journal bearing. In this study, heat transfer enhancement of curved channel having a rectangular cross-section with using inclined shape baffles is numerically investigated. The effects of different parameters of baffles, i.e. attack angle (α= 45°, 60°, and 90°), and the number of baffles (NB=9 and 13 baffles) are examined. The water is selected as working fluid for laminar and turbulent flow region. A standard k-turbulence model together with enhanced wall treatment is applied to solve the complex flow in Re of 500-5000. Influences of those parameters on heat transfer and friction performances in terms of Nusselt number, friction factor , Nussellt number enhancement ratio, and thermal performance factor, respectively are studied. The results show that the best condition to achieve maximum heat transfer at angle = 90°, NB=13 and Re=5000 compared with other conditions. Furthermore, the maximum thermal performance factor (TEF) of the curved channel with using baffles is 4.4 at the same condition. This indicated that the geometry of baffles inside curved channel can improve the heat transfer significantly with reasonable increase in friction losses.

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“…Skullong et al [10] carried out an experimental and numerical work to study the heat transfer enhancement in a heat exchanger square-duct fitted with 30° oblique horseshoe baffles (HB). Numerical flow and heat transfer behaviors such as streamlines, temperature and Nusselt number contours of the duct flow model were also reported.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Air Flow Past a Bottom Channel Wall-Attached Diamond-Shaped Baffle – Using a CFD Technique

Menni

Chamkha

Zidani

et al. 2019

Period. Polytech. Mech. Eng.

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A computational analysis has been conducted to investigate turbulent flow and convective thermal transfer characteristics in a two-dimensional horizontal rectangular section channel with a hot lower wall-mounted diamond-shaped baffle. The calculations are based on the finite volume method, by means of Commercial Computational Fluid Dynamics software FLUENT, standard k-epsilon turbulence model with QUICK numerical scheme, and the SIMPLE discretization algorithm has been applied. The fluid flow and heat transfer characteristics, i.e., dynamic pressure coefficient, stream function, mean, axial, and transverse velocities, turbulent viscosity, temperature field, skin friction coefficients, local and average Nusselt numbers, and thermal enhancement factor are presented for flow Reynolds numbers based on the aeraulic diameter of the computational domain ranging from 12,000 to 32,000 at constant surface temperature condition along the upper and lower walls. Effect of the diamond configuration of the insulated baffle is studied numerically and the data obtained from this same baffle model are also compared with that of the simple flat rectangular baffle under similar operating conditions. Over the range under investigation, the improvements are found to be around 3.962 and 29.820 times higher than the smooth air channel with no baffle for heat thermal transfer and skin friction factor, respectively. The maximum TEF is around 1.292 at the highest Reynolds number value, Re = 32,000.

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Experimental and numerical heat transfer investigation in turbulent square-duct flow through oblique horseshoe baffles

Cited by 67 publications

References 45 publications

Turbulent Heat Transfer and Pressure Loss in a Square-Duct Heat Exchanger with Inclined-Baffle Inserts

Turbulent Heat Transfer and Pressure Loss in a Square-Duct Heat Exchanger with Inclined-Baffle Inserts

Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Heat Transfer in Air Flow Past a Bottom Channel Wall-Attached Diamond-Shaped Baffle – Using a CFD Technique

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