A master thesis from Aalborg University
Numerical optimisation of vortex generators in fin and tube heat exchangers
[Numerisk optimering af vortexgeneratorer i finne og rør varmevekslere]
Author(s)
Term
4. semester
Education
Publication year
2019
Submitted on
2019-05-31
Pages
111 pages
Abstract
Denne tese søgte at undersøge den optimal konfiguration a vortexgeneratorer (VG) til at øge ydeenvnen i plade og rør varmevekslere. Dette blev udført ved brug af en konjugeret varmeoverførsels CFD model og numerisk optimering baseret på en surrogat model og en genetisk algoritme. I alt blev fem parametre undersøgt: Angrebsvinkel, VG-længde og -højde og x- og y-koordinater af VG'erne i forhold til rørcentret. Den numeriske optimering gav en konfiguration, der gav en forhøjning af varmeveksling på ≈ 24% med et øget tryktab på ≈ 7% forhold til en almindelig finnegeometri. Den nye konfiguration blev sammenlignet med resultaterne fra CFD-modellen. CFD-modellen viste at optimeringen havde en afvigelse på 1.91% for tabskoefficienten og 0.06% på Nusselt-tallet.
This thesis sought to investigate the optimal configuration for vortex generators (VG’s) for increase of performance in fin and tube heat exchangers. This was done with a conjugate heat transfer CFD model and numerical optimisation based on a surrogate model and a genetic algorithm. A total of five parameters were investigated: Angle of attack, VG -length and height and x - and y-coordinates of the VG’s relative to the tube centre. The numerical optimisation produced a configuration, that yielded a heat transfer increase of ≈ 24% with a pressure drop increase ≈ 7% in comparison to a plain fin geometry. The new configuration was compared with results from the CFD model. The CFD model showed that the optimisation had a deviation of 1.91% on the loss coefficient and 0.06% of the Nusselt number.
Keywords
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