Experimental analysis of flow boiling heat transfer characteristics in parallel microchannels under vertical vibration

In various thermal management systems, vibrations caused by external factors, such as road surface irregularities during vehicle operation, but the effect of vibration on the boiling characteristics of small-channel flow is unclear. Therefore, this study investigates the impact and underlying mechanisms of vibration acceleration ranging from 0 to 34.785 m/s2 on the heat transfer characteristics in small channels at volumetric flow rates of 158 mL/ min and 189 mL/min. The experimental heat flux density ranges from 11,680 to 30,680.5 W/m2. The results show that vibration enhances heat transfer, with the enhancement being more pronounced at lower volumetric flow rates. The boiling heat transfer coefficient can increase by up to 57.9 % compared to the stationary channel. For lower volumetric flow rates, when the heat flux density reaches 21,125 W/m2, the heat transfer coefficient in the small channel no longer increases with the vibration intensity but decreases at a vibration acceleration of 19.32 m/s2, before rising again. Compared to lower volumetric flow rates, the heat flux density and vibration acceleration at which the heat transfer coefficient decreases at higher volumetric flow rates are both higher.