Thermal Performance Analysis and Empirical Correlations for Laminar Forced Convection over 30° V-Baffled Square Channel

Boonloi, Amnart; Jedsadaratanachai, Withada

doi:10.1155/2014/930272

Cited by 7 publications

(10 citation statements)

References 16 publications

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“…The pressure drop or pressure loss across the HESC is reported in form of friction factor. The friction factor is calculated by equation (2).…”

Section: Mathematical Foundation Numerical Method Assumption and Bmentioning

confidence: 99%

“…The numerical model of the HESC inserted with the WTR is illustrated as Figure 1. The square channel height, H, is set around 0.05 m. 1,2,[18][19][20][21][22][23][24] The hydraulic diameter of the square channel, D h , is equal to the square channel height or D h = H. The WTRs (likes as wavy orifices) are installed in the HESC as the figure. The WTR height and WTR pitch represent with ''e'' and ''P,'' respectively.…”

Section: Physical Model Of Hesc Equipped With Wtrmentioning

confidence: 99%

“…The generation of the vortex flow will disturb the thermal boundary layer that is the important reason for the augmentation of the heat transfer ability and thermal efficiency. 1,2 The investigation on heat transfer ability and thermal efficiency in the heat exchangers can be done both experimental and numerical methods. The credibility of the experimental result is higher than the numerical result, while the numerical study can help to describe the flow and heat transfer patterns in the tested section.…”

Section: Introductionmentioning

confidence: 99%

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Forced convective heat transfer and thermal efficiency assessment in square channel equipped with 10° wavy thin rib

Boonloi

Jedsadaratanachai

2014

Advances in Mechanical Engineering

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Forced convective heat transfer and thermo-hydraulic efficiency in the heat exchanger square channel (HESC) inserted with 10° wavy thin rib (WTR) are reported numerically. The effects of rib height, pitch distance and flow velocity on flow and heat transfer profiles are considered. The rib height to the channel height; e/H or HR, is varied in the range 0.05–0.30, while the rib pitch to the channel height; P/H or PR, is varied in the range 0.50–1.25. The air velocity in the HESC inserted with the WTR is considered in terms of Reynolds number. The Reynolds numbers (Re = 100–2000) for the present investigation is analyzed at the inlet condition. The finite volume method (commercial code) with SIMPLE algorithm is picked to solve the present problem. The numerical model of the HESC inserted with the WTR is validated for both grid independence and verification of the smooth HESC. The numerical results of the HESC inserted with the WTR are printed in terms of flow and heat transfer profiles. The values of Nusselt number, friction factor and thermal efficiency factor in the HESC inserted with the WTR are also plotted. As the numerical result, it is found that the WTR in the HESC can produce the vortex flow that the reason for the enhancements of heat transfer and efficiency. The increment of the heat transfer ability in the HESC is detected when increasing rib height and Reynolds number. In addition, the greatest thermal efficiency factor in the HESC inserted with the WTR is around 3.43 at HR = 0.20, PR = 1, and Re = 2000.

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“…The pressure drop or pressure loss across the HESC is reported in form of friction factor. The friction factor is calculated by equation (2).…”

Section: Mathematical Foundation Numerical Method Assumption and Bmentioning

confidence: 99%

Section: Physical Model Of Hesc Equipped With Wtrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forced convective heat transfer and thermal efficiency assessment in square channel equipped with 10° wavy thin rib

Boonloi

Jedsadaratanachai

2014

Advances in Mechanical Engineering

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“…The V-baffle can induce the vortex flow, which disturbs the thermal boundary layer on the channel wall, that the reason for heat transfer rate and thermal performance enhancements. Many investigators had been reported about the augmentations on heat transfer rate and thermal efficiency by inserted the V-shaped baffle/rib in the heat exchanger channel [Boonloi (2014), Boonloi and Jedsadaratanachai (2014), Boonloi and Jedsadaratanachai (2016), Jedsadaratanachai and Boonloi (2014), Jedsadaratanachai et al (2015), Kumar et al (2017a), Kumar et al (2017b), Kumar et al (2016), Li et al (2018), Promvonge (2010), Promvonge and Kwankaomeng (2010), Promvonge et al (2012), Kumar et al (2019)]. The researchers reported that the V-shaped baffle gives higher heat transfer rate and efficiency when compared with the other types of the vortex generators.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Gap Spacing Ratio on Flow Structure and Heat Transfer Characteristic for the v-Orifice in the Square Channel Heat Exchanger

Jedsadaratanachai¹,

Boonloi²

2019

Frontiers in Heat and Mass Transfer

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The variations of flow and heat transfer in the square channel heat exchanger inserted with various parameters of V-orifice are investigated numerically. The influences of flow directions (V-Downstream and V-Upstream), gap spacing ratios (g/H or GR = 0, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) and blockage ratios (b/H or BR = 0.05, 0.10, 0.15, 0.25 and 0.30) on flow topology and heat transfer behavior are reported. The laminar flow regime with the Reynolds number in the range 100 -2000 is considered. The numerical results are presented in terms of flow and heat transfer structure in the heat exchanger channel. The thermal performance assessments in the square channel with V-orifice are also concluded. As the numerical results, the gap between the V-orifice and channel walls changes the flow and heat transfer mechanisms in the channel. The gap can reduce the friction loss in the channel and also helps to increase the turbulence of the flow. The optimum gap spacing ratio may help to increase the thermal performance of the square channel heat exchanger.

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“…They concluded that the influence of the aspect ratio is more significant for the continuous Vshaped ribs than the multiple V-shaped ribs. Boonloi and Jedsadaratanachai (2014a) presented the thermal improvement of a square channel heat exchanger with modified V-shaped baffle. The use of reformed Vshaped baffle in a square duct was also reported by Jedsadaratanachai and Boonloi (2014b).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

Boonloi¹,

Jedsadaratanachai²

2016

Journal of Mathematics and Statistics

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The numerical examinations on flow visualization, heat transfer characteristic and performance improvement in a square duct inserted with discrete V-shaped baffles (DVB) are reported. The DVB is designed to reduce the pressure loss when compared with the V-shaped baffle. The influences of the flow blockage ratios (b/H, BR = 0.05-0.20), V-tip directions (V-Downstream and V-Upstream) are investigated for Reynolds number, Re = 3000-20,000, with a single pitch ratio and flow attack angle of 1 and 30°, respectively. As the results, the DVB can generate the vortex flow and impinging flow through the test section that assists to develop the thermal efficiency. The augmentations on the heat transfer coefficient and pressure drop are around 2.5-5.75 and 4-22.5 times above the smooth duct, respectively. The best thermal efficiency in forms of thermal enhancement factor, TEF, around 2.32 is detected at Re = 3000, BR = 0.10 and V-Upstream.

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Thermal Performance Analysis and Empirical Correlations for Laminar Forced Convection over 30° V-Baffled Square Channel

Cited by 7 publications

References 16 publications

Forced convective heat transfer and thermal efficiency assessment in square channel equipped with 10° wavy thin rib

Forced convective heat transfer and thermal efficiency assessment in square channel equipped with 10° wavy thin rib

The Effects of Gap Spacing Ratio on Flow Structure and Heat Transfer Characteristic for the v-Orifice in the Square Channel Heat Exchanger

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

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