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Interaction effects between parameters in a flat-tube louvered fin compact heat exchanger with delta-winglets vortex generators.

Author(s) : DEZAN D. J., SALVIANO L. O., YANAGIHARA J. I.

Type of article: Article

Summary

The combination of multi-louvered fins and delta-winglet vortex generators is a promising strategy to enhance heat transfer in flat-tube compact heat exchangers. This paper focuses on screening analysis and, pressure drop and heat transfer characteristics of some parameters of multi-louvered heat exchangers combined with delta-winglets. Two rows of delta-winglets were considered for this research. The thermal-hydraulic performance of two distinct geometries, GEO1 and GEO2, were evaluated. The main differences between those two geometries are the louver height and delta-winglet frontal area. The contribution of the input parameters such as louver angle, angle of attack of the delta-winglet and streamwise position of the delta-winglet are also investigated in order to understand which of these parameters strongly influences heat transfer and pressure drop. Reynolds numbers of 120 and 240, based on hydraulic diameter, were investigated. The Smoothing Spline ANOVA model was used to investigate main and interaction effects among the input parameters. The randomly sample generation is performed by the Latin Hypercubes Sampling (LHS) method. The results indicate that the louver angle is the main contributor to increase the Friction factor for GEO1 and GEO2 for both Reynolds numbers. At the lower Reynolds number, the most important heat transfer parameter was the louver angle for both geometries, while at the higher Reynolds number, the angles of attack of the first row of delta-winglets mostly contributed to GEO1, and the angle of attack of the first row of delta-winglets was as important as the louver angle for GEO2. Although those specific geometries can be considered a kind of compound enhancement technique, relevant interactions were not verified between louvers and delta-winglet vortex generators parameters, i.e., the main effects were predominant in heat transfer and pressure drop.

Details

  • Original title: Interaction effects between parameters in a flat-tube louvered fin compact heat exchanger with delta-winglets vortex generators.
  • Record ID : 30017193
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 91
  • Publication date: 2015/12/05
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.08.072

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