Thermo-hydraulic characterization of a louvered fin and flat tube heat exchanger |
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Authors: | Cristian CuevasDanielle Makaire Laurent DardennePhilippe Ngendakumana |
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Institution: | a Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Concepción, Casilla 160-C, Concepción, Chile b Thermodynamics Laboratory, Aerospace & Mechanical Engineering Department, University of Liège, Building B49, 4000 Liege, Belgium |
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Abstract: | In the present study, a whole heat exchanger with a hydraulic diameter of 2.3 mm is tested, which is a minichannel heat exchanger according to the Kandlikar classification. This is a louvered fin and flat tube heat exchanger currently used in car cooling systems, also known as radiator. A glycol-water mixture (60/40 in volume) circulates through the tubes at flows ranging from 100 to 7800 l/h and at a supply temperature of 90 °C. This fluid is cooled with ambient air at a temperature of 20 °C and at frontal air velocities varying between 0.5 and 7 m/s. The thermohydraulic performance of the heat exchanger is compared with the classical correlations given in the literature for the heat transfer and the friction factor calculation. On the glycol-water side the heat exchanger is characterized for Reynolds numbers from 30 to 8000. A first comparison is carried out with the correlations available in the literature with a purely predictive model by obtaining a predictive value with a systematic under prediction lower than 10%. In a second step a semi-empirical model is considered to identify the experimental heat transfer coefficients for this application. |
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Keywords: | Louvered fin Heat transfer Friction factor Minichannel |
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