Heat transfer and performance characteristics of axial cooling fans with downstream guide vanes |
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Authors: | Alexandros Terzis Ioannis Stylianou Anestis I Kalfas Peter Ott |
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Affiliation: | 2. Group of Thermal Turbomachinery (GTT) School of Engineering, EPFL-SCI-STI-PO, CH-1015, Lausanne, Switzerland 1. Laboratory of Fluid Mechanics and Turbomachinery Dept. of Mechanical Engineering, School of Engineering, Aristotle University of Thessaloniki (AUTH), GR-54124, Thessaloniki, Greece
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Abstract: | This study examines experimentally the effect of stators on the performance and heat transfer characteristics of small axial
cooling fans. A single fan impeller, followed by nine stator blades in the case of a complete stage, was used for all the
experimental configurations. Performance measurements were carried out in a constant speed stage performance test rig while
the transient liquid crystal technique was used for the heat transfer measurements. Full surface heat transfer coefficient
distributions were obtained by recording the temperature history of liquid crystals on a target plate. The experimental data
indicated that the results are highly affected by the flow conditions at the fan outlet. Stators can be beneficial in terms
of pressure drop and efficiency, and thus more economical operation, as well as, in the local heat transfer distribution at
the wake of the stator blades if the fan is installed very close to the cooling object. However, as the separation distance
increases, enhanced heat transfer rate in the order of 25% is observed in the case of the fan impeller. |
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Keywords: | axial fans stators performance thermochromic liquid crystals transient heat transfer |
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