Heat Transfer Enhancement by Using Vortex Generators

TL;DRAbstract

The efficiency of energy converters, cooling units and heat exchangers is the most important aspect for their economical success. For heat transfer enhancement in micro heat exchangers most often passive devices like roughness elements, dimples or cavities are used. For conventional converter heat exchange is enhanced by modifying the flow with bigger scale control devices like e.g. guiding plates, diverter strakes or delta shaped winglets can be found. The main physical mechanisms causing the enhancement of heat transfer is the generation and amplification of sufficiently strong longitudinal vortices which are interacting with the thermal boundary layer. The stratification of the thermal boundary layer near the heated walls is disturbed by these vortices. The convection of warmer fluid perpendicular to the heated wall and the mixing with colder fluid is intensified, and, additionally, further external momentum is transported into the inner boundary layer region. Depending on the speci

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