Thermal performance augmentation of fin-and-tube heat exchanger using rectangular winglet vortex generators having circular punched holes

Modi, Ashish J.; Kalel, Navnath A.; Rathod, Manish K.

doi:10.1016/j.ijheatmasstransfer.2020.119724

Cited by 64 publications

(14 citation statements)

References 50 publications

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“…Investigations by Liu et al [6] concluded that this new vortex generator (VG) geometry can improve thermal-hydraulic performance. Likewise, the findings of Modi et al show that wavy up and wavy down winglet VGs with a common flow down (CFD) configuration can improve thermal-hydraulic performance [7]. The results of a study by C. Zhai thermal-hydraulic performance of the delta winglet vortex generator (DWVG) pair with a CFD configuration is better than common flow up (CFU) [8] because the vortices formed from a pair of winglets create a downwash flow toward the wall between the vortex and the two upwash flows in the outer region of the vortex in the CFD configuration.…”

Section: Introductionmentioning

confidence: 95%

Thermal-Hydraulic Performance Analysis by Means of Rectangular Winglet Vortex Generators in a Channel: An Experimental Study

Heriyani¹,

Djaeni²,

Syaiful³

2021

EJERS

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Vortex generators (VGs) are one of the effective passive models used to increase the heat transfer rate in heat exchangers. In this experiment, heat transfer from six cylinders heated to the airflow was improved by attaching rectangular winglet vortex generators (RWVGs) to a plate in a rectangular channel. The installation aimed to increase the value of the thermal-hydraulic performance evaluation criteria in the line. This experimental study was carried out by varying the fluid flow velocity from 0.4 m/s to 2 m/s with an interval of 0.2 m/s in the channel. Three pairs of VGs were arranged in both in-line and staggered configurations. The experimental results show that the thermal-hydraulic performance evaluation criteria for three pairs of vortex generators in the staggered configuration was 15.17% higher than the baseline, while the thermal-hydraulic performance of the in-line arrangement was 1.54% higher than the staggered one.

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Section: Introductionmentioning

confidence: 95%

Thermal-Hydraulic Performance Analysis by Means of Rectangular Winglet Vortex Generators in a Channel: An Experimental Study

Heriyani¹,

Djaeni²,

Syaiful³

2021

EJERS

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“…The pressure drop is the difference between the outlet and inlet pressure of the flow, written as [7]:…”

Section: Parameters Definitionsmentioning

confidence: 99%

“…The flow in this type of HE is normally in the laminar range [2]. There has recently been a lot of research on the effect of geometric and process characteristics on the heat transfer performance of CHE [3][4][5][6][7][8]. Moreover, the pressure drop has been given attention to the HE performance as higher pressure requires higher cost.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from that, based on j/f factor evaluated by the author, 45° gives the overall best heat transfer performance followed by 60°. Many types of research work on tube arrangement on heat transfer performance were done by many researchers [7,8,13,14]. Moreover, numerous studies have been conducted on the effect of various tube angles on CHE heat transfer performance [3,4,12,15].…”

Section: Introductionmentioning

confidence: 99%

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Flow and Heat Transfer Simulation Analysis of 3D Compact Heat Exchanger

Nair

Oumer

Aziz

et al. 2021

ARFMTS

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Compact heat exchangers (CHEs) are one of the most commonly used heat exchangers in the industry due to their superior advantages over other types of heat exchangers. Various geometric (fin spacing, tube inclination angle, etc) and process (such as flow velocity, temperature, etc) parameters affect the performance of such compact HEs. This research aims to examine the effects of fin spacing, tube inclination angle, and airflow velocity on heat transfer and pressure drop performance of CHE in both inline and staggered configurations. A three-dimensional (3D) numerical method with the aid of Ansys FLUENT software was carried out for the laminar flow condition. Based on the obtained results, the highest average heat transfer coefficient was observed at 120° for both tube arrangements while the lowest average pressure drop penalty is at 30°. Therefore, the recommended inclination angle when high heat transfer is needed is at 120° while if the pumping power is the major problem, 30 °or 150° is recommended. based on the London area goodness factor (j/f), 30° and 150° show the highest value for both configurations. The j/f factor decreases with the increase of Reynolds number for both configurations. In addition, 120° shows the lowest j/f which can be due to the high pressure drop.

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“…There are many teams of researchers who have been trying to improve ability of heat transfer for various heat exchangers such as fin-and-tube heat exchangers (Jinlong and Hsiao Mun (2020), Modi et al (2020) and Gupta et al (2020)), shell-and-tube heat exchangers (Yu et al (2020), Chamoli et al (2018a), Liu et al (2018), Piriyarungrod et al (2018), Eiamsa-ard et al (2019)), plate-fin heat exchangers (Samadifar and Toghraie (2018) and Khoshvaght-Aliabadi et al (2016)), solar air heaters (Chamoli et al (2018b). The researchers have been selecting two modes; active and passive methods, to improve thermal efficiency and heat transfer coefficient in the heating/cooling systems.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Assessment in a Circular Tube Fitted With Various Sizes of Modified v-Baffle: A Numerical Investigation

Jedsadaratanachai¹,

Boonloi²

2021

Frontiers in Heat and Mass Transfer

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This research reports numerical examinations on fluid flow, heat transfer behavior and thermal performance analysis in a circular tube equipped with modified V-baffles (CTMVB). The modified V-baffle (MVB) is a combination vortex generator between V-baffles/V-orifices which are placed on the tube wall and V-baffles which are inserted at the core of the tested tube. The MVB height is separated into two parts; b1 represents the MVB height on the tube wall, while b2 represents the MVB height at the core of the tested round tube. The MVB height to tube diameter ratios, b/D, are adjusted; b1/D = 0.05, 0.1, 0.15 and 0.2, and b2/D = 0.025, 0.05, 0.075 and 0.1. The Reynolds numbers of about 100 -2000 (laminar regime) are considered. The flow directions in the tested section; V-tip directing downstream and V-tip directing upstream, are discussed. The flow attack angles for the MVB, α, of about 20 o and 30 o are compared. The finite volume method with SIMPLE algorithm (a commercial code) is opted to analyze the present investigation. The computational domain of the CTMVB is validated (grid independence and smooth tube validations). It is found that the MVB generates many vortex cores in the tested section. The vortex flows near the tube wall disrupt thermal boundary layer, while the vortex flows at the center of the tube help superior fluid blending. The disturbed thermal boundary layer and the better fluid blending are main two causes for heat transfer augmentation. In addition, the best thermal enhancement factor of the CTMVB is found to be around 3.92.

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Thermal performance augmentation of fin-and-tube heat exchanger using rectangular winglet vortex generators having circular punched holes

Cited by 64 publications

References 50 publications

Thermal-Hydraulic Performance Analysis by Means of Rectangular Winglet Vortex Generators in a Channel: An Experimental Study

Thermal-Hydraulic Performance Analysis by Means of Rectangular Winglet Vortex Generators in a Channel: An Experimental Study

Flow and Heat Transfer Simulation Analysis of 3D Compact Heat Exchanger

Thermal Performance Assessment in a Circular Tube Fitted With Various Sizes of Modified v-Baffle: A Numerical Investigation

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