An investigation of the average heat transfer coefficient in a heat exchanger for cooling of light-emitting diodes has been carried out by using CFD. The numerical calculations show good agreements with experimentally obtained data on a full scale model. Both CFD and experiments are carried out for Reynolds numbers in the range of 1000 to 10000, where the resulting average heat transfer coefficient is up to 5 times higher than expected values based on classical analytical expressions for the heat transfer coefficient. The explanation for the significant increase in the average heat transfer coefficient shall be found in a relative short tube length combined with a strong swirling flow inside the heat exchanger.

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