微流控氧化硅纳米流体强化流动沸腾传热

Enhanced microchannel flow boiling heat transfer using nanofluids is an effective method to improve the heat transfer Performance of high-power electronic devices. However,conventional nanofluids face the challenges of complex fabrication processes,poor stability,and the inability to control nanoparticle size,which negatively affect the overall heat transfer efficiency. A simple microfluidic synthesis strategy is developed to prepare highly stable and size-controlled silica nanofluids in a continuous* efficient and high-throughput manner. A specially designed helical microchannel reactor enables continuous flow one-step synthesis of stable nanofluids with controllable particle sizes ranging from 30 nm to 110 nm simply by flow rate adjustment. The results of flow-boiling heat transfer experiments show that at higher flow rates(0. 4 m/s) > the heat transfer Performance of smaller-sized nanoparticles (^J 55 nm) is better than that of larger-sized nanoparticles (110 nm), and the enhancement for critical heat flux(CHF) and heat transfer coefficient (HTC) reaches 90.9% and 68% respectively. The enhanced wettability of the boiling surface, efficient surface nucleation>and improved bubble dynamics provide theoretical explanations for the enhanced heat transfer Performance.These findings provide not only a new method for controllable preparation of nanofluids,but also new ideas for efficient two-phase chip cooling of power devices in aerospace and power electronics.