Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers

Wang, Chi-Chuan; Lee, Chung-Cheng; Chang, Ching-Hung; Lin, Shun-Chieh

doi:10.1016/s0017-9310(98)00302-0

Cited by 209 publications

(69 citation statements)

References 5 publications

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“…Manglik et al [14] presented an overview of previous correlations for the slit fin geometry and a new correlation. Based on a large database of experimental data, thermo-hydraulic correlations were derived for the slit fin (Wang et al [15]) and for the louvered fin (Wang et al [16]). Next to these full scale heat exchanger tests, some authors have focused on the flow behaviour within these interrupted fin designs, in order to better grasp the physics of the heat transfer enhancement.…”

Section: Main Flow Manipulationmentioning

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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Section: Main Flow Manipulationmentioning

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 Figure 8, according to the design parameters of heat exchanger, variations in the heat transfer coefficient and fin efficiency are predicted using heat transfer model of Wang(1999). Heat transfer coefficient decreases when either the fin pitch or the transverse tube pitch increases.…”

Section: Variations In Heat Transfer Coefficient and Fin Efficiencymentioning

confidence: 99%

Modeling and Performance Simulation of a Gas Cooler for a CO ₂ Heat Pump System

Chang¹,

Kim

2007

HVAC&R Research

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The outlet temperature of gas cooler has a great effect on the efficiency of carbon dioxide heat pump system. In order to obtain a small approach temperature difference at gas cooler, near-counter flow type heat exchanger has been proposed, and larger heat transfer area is demanded. The optimum design of gas cooler involving the analysis of trade-offs between heat transfer performance and cost is desirable. In this study, a simulation model has been developed for fin-tube type gas cooler, and the air-side heat transfer correlation has been proposed. A developed model was confirmed by experimental results. The effects of geometric parameters, such as the tube arrangement, transverse tube spacing, longitudinal tube spacing and the number of tube rows and fin spacing on the performance of heat transfer were investigated using the developed model. This study suggested various simulation results for optimum designs of gas cooler.

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“…In modern heat exchangers this is done through a transition of the angled louvers to a flat fin surface (the so called landing), which is then connected to the tubes through mechanical or hydraulic expansion [10]. Cui and Tafti [11] showed that the flow on the angled louver is nominally two-dimensional, which justifies the two-dimensional studies of the flow efficiency discussed above.…”

Section: Introductionmentioning

confidence: 90%

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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Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers

Cited by 209 publications

References 5 publications

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

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

Modeling and Performance Simulation of a Gas Cooler for a CO ₂ Heat Pump System

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

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Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers

Cited by 209 publications

References 5 publications

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

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

Modeling and Performance Simulation of a Gas Cooler for a CO 2 Heat Pump System

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

Contact Info

Product

Resources

About

Modeling and Performance Simulation of a Gas Cooler for a CO ₂ Heat Pump System