Flow, heat transfer, and pressure drop in the near-wall region of louvered-fin arrays

DeJong, N. C.; Jacobi, Anthony M.

doi:10.1016/s0894-1777(02)00224-8

Cited by 50 publications

(14 citation statements)

References 17 publications

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“…The fluid flow characteristics in plate-fin heat exchanger are symmetrical and repeatable, except in sections that are close to the boundary wall, outlet and inlet. DeJong and Jacobi [7] obtained the same conclusion in the experimental study work on plate-fin heat exchanger with louvered fins. The study result revealed that the boundary walls do not affect flow in the center of the array anywhere in its flow path, and fluid flow is spatially periodic far from the walls.…”

Section: Physical Modelsupporting

confidence: 59%

Numerical Study on Plate‐Fin Heat Exchangers with Plain Fins and Serrated Fins at Low Reynolds Number

et al. 2009

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A simpler numerical model for plate-fin heat exchangers with plain fins and serrated fins is presented, which incorporates the characteristics of fluid flow and heat transfer. The numerical simulations for heat exchangers with two fins at low Reynolds numbers are carried out by employing the simplified model and using the CFD code FLUENT. The results of heat transfer rate and pressure drop in numerical simulations are compared with the experimental results from the literature. It is shown that the results are in good agreement and the numerical model is reasonable and appropriate. The characteristics of fluid flow and heat transfer are analyzed and compared based on the numerical results. It is concluded that by applying the average heat transfer coefficient in practice, the heat transfer rate of the primary surface is overestimated, and the heat transfer rate and efficiency of the secondary surface are underestimated. The numerical modeling and conclusions provide the method and theoretical basis for the selection, optimization and analysis of plate-fin heat exchangers.

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Section: Physical Modelsupporting

confidence: 59%

Numerical Study on Plate‐Fin Heat Exchangers with Plain Fins and Serrated Fins at Low Reynolds Number

et al. 2009

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“…The scaling factor was selected in order to obtain sufficient spatial resolution, while maintaining a sufficiently large number of fin rows to ensure periodic flow behaviour. DeJong and Jacobi [28] showed that wall effects can result in a strong distortion of the measured mean flow angle in louvered fins and they presented a calculation method to determine the minimal number of fin rows required. This method was used to guide the scaling factor of the fin array.…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

T’Joen¹,

Huisseune²,

Canière³

et al. 2011

International Journal of Heat and Mass Transfer

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In this study the inclined louvered fin, a hybrid fin design based on the slit fin and louvered fin design is considered. The goal of the research program is to investigate the interaction between the flow behaviour (flow deflection and transition to unsteady flow) and the thermo-hydraulics of the fin design. This approach was selected in order to reveal the flow physics behind the transitions found in the thermo-hydraulic data.

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“…The scaling factor was selected to obtain sufficient spatial resolution, while keeping the dimensions of the test section within acceptable limits. DeJong and Jacobi [28] showed that the channel walls can have a profound impact on flow visualization in louvered fin arrays and they presented a calculation method to determine the minimum number of fins required to avoid wall effects. This method was used to guide the selection of the scaling factor.…”

Section: Scaled-up Modelsmentioning

confidence: 99%

Study of junction flows in louvered fin round tube heat exchangers using the dye injection technique

Huisseune

T’Joen

Jaeger

et al. 2010

Experimental Thermal and Fluid Science

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Detailed studies of junction flows in heat exchangers with an interrupted fin design are rare. However, understanding these flow structures is important for design and optimization purposes, because the thermal hydraulic performance of heat exchangers is strongly related to the flow behaviour. In this study flow visualization experiments were performed in six scaled-up models of a louver fin round tube heat exchanger. The models have three tube rows in a staggered layout and differ only in their fin spacing and louver angle. A water tunnel was designed and built and the flow visualizations were carried out using dye injection. At low Reynolds numbers the streakline follows the tube contours, while at higher Reynolds numbers a horseshoe vortex is developed ahead of the tubes. The two resulting streamwise vortex legs are destroyed by the downstream louvers (i.e. downstream the turnaround louver), especially at higher Reynolds numbers, smaller fin pitches and larger louver angles. Increasing the fin spacing results in a larger and stronger horseshoe vortex. This illustrates that a reduction of the fin spacing results in a dissipation of vortical motion by mechanical blockage and skin friction. Furthermore it was observed that the vortex strength and number of vortices in the second tube row is larger than in the first tube row. This is due to the thicker boundary layer in the second tube row, and the flow deflection, which is typical for louvered fin heat exchangers. Visualizations at the tube-louver junction showed that in the transition part between the angled louver and the flat landing a vortex is present underneath the louver surface which propagates towards the angled louver.

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Flow, heat transfer, and pressure drop in the near-wall region of louvered-fin arrays

Cited by 50 publications

References 17 publications

Numerical Study on Plate‐Fin Heat Exchangers with Plain Fins and Serrated Fins at Low Reynolds Number

Numerical Study on Plate‐Fin Heat Exchangers with Plain Fins and Serrated Fins at Low Reynolds Number

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

Study of junction flows in louvered fin round tube heat exchangers using the dye injection technique

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