A fast running numerical model based on the implementation of volume forces for prediction of pressure drop in a fin-tube heat exchanger
2014 (English)In: Applied Mathematical Modelling, ISSN 0307-904X, E-ISSN 1872-8480, no 24, 5822-5835 p.Article in journal (Refereed) Published
Numerical based design of geometrical structures is common whenstudying systems involving heat exchangers, a central component inseveral fields, such as industrial, vehicle and household systems. Thegeometrical structure of heat exchangers is generally comprised byclosely placed fins and tube bundles. The creation of a mesh grid for ageometrically compact heat exchanger will result in a dense structure,which is not feasible for personal computer usage. Hence, volume forceswere created based on Direct Numerical Simulations (DNS) on a FlowRepresentative Volume (FRV) of a tube fin heat exchanger in an internalduct system of a heat pump tumble dryer. A relation of the volumeaveraged velocity and the volume averaged force was established in twodifferent FRV-models with a finite element simulation in COMSOL. Thisrelation was subsequently used to create flow resistance coefficientsbased on volume averaged expressions of fluid velocity and volume forces.These flow resistance coefficients were implemented in two respectiveporous models, which represent the entire heat exchanger except theinterior arrangements of fins and tube bundles. Hence, the computationtime was reduced thanks to the absence of a dense mesh grid. Experimentalresults of the entire heat exchanger showed good agreement with thesecond porous model in terms of pressure drop and volume flow rate.
Place, publisher, year, edition, pages
Elsevier, 2014. no 24, 5822-5835 p.
CFD, Heat exchanger, Tumble dryer, Comsol MultiPhysics, Volume forces
Fluid Mechanics and Acoustics
Research subject Environmental and Energy Systems
IdentifiersURN: urn:nbn:se:kau:diva-31951DOI: 10.1016/j.apm.2014.04.051ISI: 000346214000005OAI: oai:DiVA.org:kau-31951DiVA: diva2:713393