Experimental and numerical investigation on air-side performance of fin-and-tube heat exchangers with various fin patterns

Tang, Linghong; Zeng, Min; Wang, Qiuwang

doi:10.1016/j.expthermflusci.2009.02.008

Cited by 157 publications

(54 citation statements)

References 25 publications

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“…Moreover, they play important role in electronics cooling. Compact HE has substantial small sizes due to the reason that the highest thermal resistance occurs in the air side of the HE compared to the tube side and wall conductive thermal resistance, which makes the air side heat transfer coefficient relatively small [4,[9][10][11]. Hence, to decrease the size of HE, significant improvements have been employed on the air side.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

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The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This paper investigates the effects of flat tube inclination angles on heat transfer and pressure drop characteristics of fined flat tube HE when the tubes are deployed in in-line and staggered arrangements. A symmetric numerical method based on FLUENT software was carried out with six different tube inclination angles (0°, 30°, 60°, 90°, 120°, and 150°) in moderately high Reynolds number. From the results, it was observed that heat transfer coefficient increased with the augmentation of the tube inclination angle from 0 o to 90 o and decreased for 120 o and 150 o . With the increase of tube inclination angle, the average Nusselt number rose by 36.3%. This might be due to the reason that the tube surface area increases with the inclination angle, which also results in the largest increment of the pressure drop by 42.0%. Overall, the 90 o tube inclination angle showed the highest enhancement in heat transfer for both inline and staggered configurations with a maximum enhancement of 41.2% for in-line and 32.2% for staggered arrangements. However, the heat transfer enhancements were accompanied by high-pressure drop penalties of up to 44.2% and 42.6% for in-line and staggered arrangements, respectively. Therefore, inclining the tubes at 90 o is recommended where high heat transfer is required. On the other hand, 0 o tube inclination angle is recommended where pumping power is a crucial issue.

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Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

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“…Vortex Generators have been intensively investigated recently [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Jacobi et al [22][23][24][25][26][27][28] studied on wavy finned tube with different configurations of delta wing vortex generators. From the literature review shows that in overall most of the research work focused on simple wave ratio.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer Enhancement and Entropy Generation of Laminar Flow of Water through a Wavy Channel

Bhattacharyya¹,

Chattopadhyay²,

Swami³

et al. 2016

IJHT

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Using computational analysis, convective heat transfer enhancement and entropy generation of laminar flows through wavy channels was examined. A three-dimensional geometry was used for simulation. The simulation was performed using non dimensional governing equations for a steady laminar flow. The flow is both thermally and hydrodynamically developing while the channel walls are kept at a constant temperature. The computations were conducted with Reynolds number ranging from 100 to 2000 using water (Pr = 7.0) as the working fluid. The numerical simulation was carried out by using two different diameter ratio (W = L/D) and three different wave ratio (Y = P/D) to reach the optimal geometry with the maximum performance evaluation criterion. The results showed that the heat transfer performance in wavy channel was enhanced than a typical circular channel. The pressure drop also increased in case of wavy channel and smaller wave ratio has more friction penalty. Generally, the heat transfer performance of wavy channel has an enhanced heat transfer performance because of the thermal boundary layer disturbance and block of longitudinal heat transfer.

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“…Colburn j-factor and Fanning friction factor (f -factor), which are dimensionless numbers, were used to determine the effective area factor, and the performance of the proposed enhanced fin configuration was compared to existing fin configurations. Tang et al [7] performed experimental and numerical analyses on fin-type and tube-type heat exchangers, the tube-type having a hydraulic diameter of 18 mm, with the performances of the vortex generators for the two types of exchangers compared in terms of both heat transfer and pressure drop. The results showed that the tube-type vortex generator had better heat performance than the slit fin-type vortex generator when the flow length was extended and as the height decreased in the high flux region.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Seo

Cho²,

Lee

et al. 2015

Entropy

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This paper presents the heat transfer and pressure drop characteristics of a primary surface heat exchanger (PSHE) with corrugated surfaces. The PSHE was experimentally investigated for a Reynolds number range of 156-921 under various flow conditions on the hot and cold sides. The inlet temperature of the hot side was maintained at 40˝C, while that of the cold side was maintained at 20˝C. A counterflow was used as it has a higher temperature proximity in comparison with a parallel flow. The heat transfer rate and pressure drop were measured for various Reynolds numbers on both the hot and cold sides of the PSHE, with the heat transfer coefficients for both sides computed using a modified Wilson plot method. Based on the results of the experiment, both Nusselt number and friction factor correlations were suggested for a PSHE with corrugated surfaces.

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Experimental and numerical investigation on air-side performance of fin-and-tube heat exchangers with various fin patterns

Cited by 157 publications

References 25 publications

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Convective Heat Transfer Enhancement and Entropy Generation of Laminar Flow of Water through a Wavy Channel

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

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