Numerical investigation of laminar heat transfer in a square channel with 45° inclined baffles

Promvonge, Pongjet; Sripattanapipat, Somchai; Tamna, Sombat; Kwankaomeng, Sutapat; Thianpong, Chinaruk

doi:10.1016/j.icheatmasstransfer.2009.09.010

Cited by 86 publications

(46 citation statements)

References 15 publications

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“…Saini [13] experimentally investigate the relation between heat transfer and friction factor for solar air heater duct with v-ribs artificial rougnness. Eiamsa-ard et al [14] investigated the heat transfer augmentation in a SAC with winglet delta twisted tape baffles with different βO and Hb/Hd. Their studies shows that Nurs and frs data with winglet delta twisted tape were superior as compared to without winglet delta twisted tape.…”

Section: IImentioning

confidence: 99%

Performance Evaluation on Double Pass Solar Air Heater with Broken Multiple V-Type Baffles- A Review

Kumar¹

2018

IJRASET

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Thermal performance of double pass solar air heater has been found to be improved by the use of artificial roughness provided on the both side of the absorber plate. The roughness provided on the absorber plate for increasing the heat transfer is also used to increase the pressure drop due increased friction. The heat transfer enhancement of absorber plate has been experimentally determined by using v-shaped baffle with multiple gaps. An experimental study will be carried out to analyze the effect of v-shape with gap baffles used as roughness geometry on heat transfer along its friction factor. The heat transfer and friction factor data obtained from the experiment is compared with the data obtained from smooth duct under the same condition. Correlation will also develop for Nusselt number (Nu) and friction factor (f) as a function of roughness and flow parameter. The maximum enhancement in the Nusselt number and friction factor is observed.

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Section: IImentioning

confidence: 99%

Performance Evaluation on Double Pass Solar Air Heater with Broken Multiple V-Type Baffles- A Review

Kumar¹

2018

IJRASET

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“…They summarized that the two baffles perform higher heat transfer rate than the single baffle. Promvonge et al (2010) selected the 45° inclined baffles to enhance heat transfer rate and thermal performance in a square channel heat exchanger. They reported that the 45° inclined baffles can generate the vortex flow through the test section that the reason for heat transfer augmentation.…”

Section: Introductionmentioning

confidence: 99%

Laminar Flow and Heat Transfer in a Square Channel Installed with Inclined Wavy Surface

Boonloi¹,

Jedsadaratanachai²

2017

Journal of Mathematics and Statistics

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Laminar flow and heat transfer characteristic in a square channel heat exchanger installed with inclined wavy surface are investigated numerically. The inclined wavy surface is designed with the main the aim to help the installation, production and maintenance when using the inclined wavy surface in the heat exchanger. The finite volume method with SIMPLE algorithm is selected to solve the present problem. The effects of flow attack angle (α = 15°-60°) and Reynolds number (Re = 100-1200) on heat transfer, friction loss and thermal performance are considered. The numerical model is validated with the smooth channel. The grid independence of the computational domain is checked. The numerical results show that the heat transfer enhancement is around 1.9-7.5 times above the smooth channel. The optimum thermal performance is found at the flow attack angle of 45° around 2.35 at Re = 1200.

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“…However, most studies in the past [1][2][3] showed that when solid rib is placing with attack angle normal to the main flow direction, it induces local heat transfer deterioration and subsequent hot spot formation behind the rib or baffle. There are many researches for developing new baffle to enhance heat transfer using inclined baffles or wavy baffles [4][5][6][7][8][9][10][11][12]. Promvonge et al [5] studied the heat transfer and fluid flow behaviors in a square channel fitted with 45° inclined baffles on one channel wall for Reynolds numbers ranging from 100 to 1200 and flow blockage ratios (BR) ranging from 0.1 to 0.5.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics in a channel fitted with zigzag-cut baffles

et al. 2015

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The heat transfer characteristics were experimentally investigated in a wind channel with different types of cut baffles for heat transfer augmentation. The aim of using zigzag-cut baffles is to create 3D flow structure behind the baffles instead of transverse vortex flow leading to enhance heat transfer. In this study, 4 types of baffles were examined; conventional baffle (Rectangular cross section with no cut), baffle with rectangular zigzag-cut, baffle with triangle zigzag-cut at 45 degree and at 90 degree. All of the baffles have the same height at H = 15 mm and flow blocking area. In the experiment, the row of seven baffles was attached on the inner surface of wind channel. The effects of pitch spacing length were also investigated at baffle pitch distance P/H = 4, 6 and 8 (H: Height of baffle). The experiments were performed at constant Reynolds number (Re) of 20000. The heat transfer patterns via Thermochromic liquid crystal sheet were visualized and recorded with a digital camera. The recorded images were then analyzed with image processing technique to obtain the distribution of Nusselt number. The flow characteristics pass through the baffles were also numerically studied with CFD simulation for understanding the heat transfer characteristics. The friction losses were measured to evaluate the thermal performance for each baffle. It was found that the baffle with rectangular zigzag-cut gives the best thermal performance due to heat transfer augmentation in upstream and downstream side of baffle.

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Numerical investigation of laminar heat transfer in a square channel with 45° inclined baffles

Cited by 86 publications

References 15 publications

Performance Evaluation on Double Pass Solar Air Heater with Broken Multiple V-Type Baffles- A Review

Performance Evaluation on Double Pass Solar Air Heater with Broken Multiple V-Type Baffles- A Review

Laminar Flow and Heat Transfer in a Square Channel Installed with Inclined Wavy Surface

Heat transfer characteristics in a channel fitted with zigzag-cut baffles

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