Scaling of heat transfer coefficients along louvered fins

Lyman, Andrew C.; Stephan, Ryan A.; Thole, Karen A.; Zhang, L. W.; Memory, S.B.

doi:10.1016/s0894-1777(02)00163-2

Cited by 56 publications

(23 citation statements)

References 10 publications

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“…Only five louver rows were heated: those surrounding the center row where the temperature measurements are done. It is important to heat the adjacent fin rows in order to accurately capture any thermal wake effects, as shown by Lyman et al [23]. By measuring the local air velocity (using a pitot tube) and temperature in the wake of the fin array the heat balance was verified to be within 5%.…”

Section: Transition To Unsteady Flowmentioning

confidence: 97%

“…Flow efficiency increases with Re and louver angle, while decreasing with fin pitch and thickness ratio. Local heat transfer coefficients in louvered fins presented by Lyman et al [23] showed the impact of the local thermal field surrounding a louver. If a louver is surrounded by the hot thermal wake of an upstream louver, it will have a lower heat transfer coefficient.…”

Section: Main Flow Manipulationmentioning

confidence: 99%

“…As a reference temperature, the inlet air temperature was used to allow for an easy comparison with other researchers. Alternative reference temperatures include the bulk mean temperature (which can result in biased values due to thermal wake effects, as shown by Zhang and Tafti [35] and Lyman et al [23]) or the adiabatic mean temperature as introduced by Moffat [36]. The latter represents the actual driving potential for heat transfer and enables the effects of the flow field and thermal field to be separated.…”

Section: Data Reductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Transition To Unsteady Flowmentioning

confidence: 97%

Section: Main Flow Manipulationmentioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…Lyman et al performed experimental studies on different louver models with varied fin pitch and louver angles over a range of Reynolds numbers. A method for evaluating spatially resolved louver heat transfer coefficients was presented [3]. Weijuan and Pingfang presenteda method to predict the coefficient of performance (COP) of the heat pump and the COPs of ground source heat pump (GSHP) system with limited parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulant Study on the Ground Source Heat Pump in Winter of Hefei

Li¹,

Hu²,

Jiang³

et al. 2016

Proceedings of the 2015 4th International Conference on Sustainable Energy and Environmental Engineering

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Based on the operation of a Ground Source Heat Pump (GSHP) in Hefei, the heat exchange of the 100m depth vertical u-shaped pipe buried in the ground was analyzed, and the heat transfer performance, efficiency of the system and temperature variation of the ground were studied experimentally under the typical climate in Hefei. Temperature changes of the field near the heat exchanger after 8h and 24h were analyzed by numerical simulation. Results show that the system has a good performance in winter.

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“…They showed that the performance advantage of the elliptical tube arrangements resulted from the higher fin efficiency [6]. Lyman et al conducted experiments in a number of large-scale louver models with varied fin pitch and louver angle over a range of Reynolds numbers [3]. Nuntaphan et al analysed the effect of inclination angle on the louver finned tube heat exchanger in natural convection condition.…”

Section: Introductionmentioning

confidence: 99%

Fin-tube heat exchanger performance for different louver angles

Wais

2014

ZN PRz Mechanika

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To choose the proper design for a heat exchanger in engineering industry and to evaluate the finned surface performance it is important to calculate fin efficiency. The heat transfer conditions, in tube-fin heat exchangers, can be modified for instance by changing the fin shapes. The angle of louver inclination affects the fluid flow direction and it has the effect on the heat transfer and temperature changes. In the paper, the heat transfer is estimated numerically for fins with and without louvers to choose the optimal louver angle in the car radiator. Numerical analyses are carried out to examine finned tube heat exchanger and to determine the performance of the radiator for eight different louver angles. Solutions are obtained by means of ANSYS program. The tube material is kept fixed as well as the heat exchanger fin and tube pitches (spacing) and the inlet air velocity.

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Scaling of heat transfer coefficients along louvered fins

Cited by 56 publications

References 10 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

Experimental and Simulant Study on the Ground Source Heat Pump in Winter of Hefei

Fin-tube heat exchanger performance for different louver angles

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