Ko Minakami

Visualization of Flow Mixing Mechanisms in Pin-Fin Arrays

The flow visualization tests were carried out for enlarged pinarray models using a reacting-dye injection technique in order to evaluate the effects of the pin cross-sectional shape. Measurements on heat transfer characteristic of pin-fin arrays were also conducted. The test results showed a good correspondence between the heat transfer phenomenon and the flow pattern characteristic.

Evaluation of Heat Transfer Coefficient for Heat Exchanger's Fins Using a Scannning Infrared Camera

The improvement and compactness of heat exchangers need the technique for fins heat transfer promotion. Several ideas have been created, for example, setting slits on fins etc.. However, it is impossible that prototypes for all the ideas are produced, and their performance are estimated.Therefore, we considered the heat transfer characteristics for one fin. In order to investigate them, the surface temperature of the fin, which was heated uniformly by direct current, was measured using a scanning infrared camera. And the heat transfer coefficient was calculated.It is significant to change the visualization data to the heat transfer coefficient, which is quantitative value, in this study.