03. Electronics Packaging and Thermal Management

This study conducted the condensation heat transfer experiment of HFE-7100 with non-condensable gases on the plain tube and fin tube. The saturation temperature of the system was 50°C, the heat flux ranges from 8000 to 18000W/m2. Four tubes are arranged in a vertical row. The outside diameter of the tubes is 19.05mm and 18.42mm for the plain and fin tubes, respectively. The mass fractions (Wa) of the non-condensable gas varied from 0, 0.5, 1, and 2% in the chamber. The cooling water flows into the tubes from either the top or bottom end, and the tube bundle with two tilting angles, 0°, 30°, were tested. The experimental results showed that the condensation heat transfer of both tube types decreases with the increase of non-condensable gas concentration. The heat transfer coefficient of the fin tube is about 10 times better than the plain tube in pure vapor, but the influence of non-condensable gas is more severe for the fin tube. When Wa is 2%, the heat transfer coefficient of the fin tube decreases by about 80% as compared with pure vapor. The heat transfer ability for cooling water entering from the top is better than that from the bottom, and it is better for a tilting angle 30° than that for 0° with fixing other test parameters.