Heat transfer and pressure drop characteristics of flat tube and louvered plate fin surfaces

Achaichia, A.; Cowell, T. A.

doi:10.1016/0894-1777(88)90032-5

Cited by 192 publications

(79 citation statements)

References 6 publications

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“…At high Reynolds numbers, however, the flow became nearly parallel to louvers. Achaichia and Cowell (4) further confirmed that, through heat transfer tests on flat tube heat exchangers having louvered plate fins, the heat transfer coefficients approached those of duct flow at sufficiently low Reynolds numbers. At high Reynolds numbers, the heat transfer coefficients were parallel to those of the laminar boundary layer for a flat plate.…”

Section: Introductionsupporting

confidence: 57%

Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Kim

Choi

et al. 2009

JTST

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The effect of inclination angle on the heat transfer and pressure drop characteristics of brazed aluminum heat exchangers having louvered fins is experimentally investigated. Three samples having different fin pitches (1.25, 1,5 and 2.0 mm) were tested. Results show that heat transfer coefficients are not affected by the inclination angle. Friction factors, however, increase as the inclination angle increases, with negligible difference between the forward and the backward inclination. Both the heat transfer coefficient and the friction factor are the smallest at F p = 1.5 mm, followed by 2.0 mm and 1.25 mm. Possible explanation is provided considering the louver layout. Comparison of the present data with existing correlations is also made.

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Section: Introductionsupporting

confidence: 57%

Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Kim

Choi

et al. 2009

JTST

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“…PF 2 and PFSF heat exchangers have basically the same dimensions, which are 152 mm length by 149 mm height by 21 mm width, and differ only in fin type (parallel fin and serpentine). PF 2 and PFSF were single-row heat exchanger with 19 mm tube major by 1.9 mm tube minor flat tube, while RTPF heat exchanger were two-row heat exchanger with the outside diameter of 9.5 mm round tubes. All three heat exchanger structures are shown in …”

Section: The Types Of Heat Exchangers Exploredmentioning

confidence: 99%

Air-side performance evaluation of three types of heat exchangers in dry, wet and periodic frosting conditions

Zhang

Hrnjak

2009

International Journal of Refrigeration

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The performances of three types of heat exchangers that use the louver fin geometry: 1. parallel flow parallel fin with extruded flat tubes heat exchanger (PF 2 ), 2. parallel flow serpentine fin with extruded flat tubes heat exchanger (PFSF) and 3. round tube wave plate fin heat exchanger (RTPF) have been experimentally studied under dry, wet and frost conditions and results are presented. The parameters quantified include air-side pressure drop, water retention on the surface of the heat changer, capacity for air face velocity 0.9, 2 and 3 m/s, air humidity 70% and 80%. The performances of three types of heat exchanger are compared and the results obtained are presented. The primary goal of this project is to explore the thermal hydraulic performance of PF 2 heat exchanger in refrigeration and heat pump systems. Using both the dip testing method and wind tunnel experiment assess the condensate drainage behavior of the air-side surface of these three heat exchanger types.

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“…The characteristic parameters of the louvered fin geometry are also indicated in Figure 1. Through a two-dimensional finitedifference analysis, Achaichia and Cowell [7] illustrated that increasing the Reynolds number results in a transition of the flow from duct-directed to more louver-directed. This is an example of 'boundary layer driven flows'.…”

Section: Introductionmentioning

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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Heat transfer and pressure drop characteristics of flat tube and louvered plate fin surfaces

Cited by 192 publications

References 6 publications

Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Air-side performance evaluation of three types of heat exchangers in dry, wet and periodic frosting conditions

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

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