低流量域熱交換器チューブにおける熱伝達促進の特性

抄録

According to the downsizing of automotive equipment, the present report discussed the heat exchange efficiency in intercoolers used in turbochargers system, etc. Due to the downsizing, low-flow-rate heat exchanger such as installed in a sub-radiator, or the electronic devices in hybrid and electric vehicles. In a low flow rate regime, we can propose a method for promoting convective heat transfer by installing a protrusion on the surface to generate a calm swirling flow. In this study, we visualized the flow using a temperature-sensitive liquid crystal that promotes the heat transfer coefficient while suppressing the increase in pressure loss caused by the method of generating swirl flow with protrusions. In this study, experiments were conducted using a model of the tube part without cooling fins. The size of the channel is 16mm x 120mm x 1.2mm. We visualized the flow using the temperature-sensitive liquid crystal that promotes the heat transfer coefficient while suppressing the increase of pressure loss caused by the method of generating the swirl flow by the protrusion using the temperature-sensitive liquid crystal. From the results obtained in the temperature-sensitive liquid crystal experiment and the results obtained from the numerical analysis, it can be confirmed that the temperature distribution of the entire flow path is increased by installing V-shaped projections. Therefore, it can be said that it is necessary to improve the experimental apparatus in the future and compare the obtained temperature boundary layer with the approximate solution to confirm the validity of the experiment.