The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement....The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement. The effects on absorption coefficient were systematically assessed. The results show that the sound absorption performance is improved by increasing the sample porosity and/or thickness, and/or increasing the air-cavity thickness. Meanwhile, increasing the temperature gives better acoustic absorption performance in the low frequency range but also lowers the performance in the high frequency range, while double-layer structure enables better acoustic absorption performance.展开更多
The electric field enhancement of natural convection and pool boiling heat transfer on a plate surface immersed in ether was investigated.The experimental data indicated that electric field could enhance natural conve...The electric field enhancement of natural convection and pool boiling heat transfer on a plate surface immersed in ether was investigated.The experimental data indicated that electric field could enhance natural convection and pool boiling heat transfer.The enhancement effect of electric field on natural convection heat transfer was larger than the effect on pool boiling heat transfer.For natural convection heat transfer on plate surface immersed in ether,the enhancement effect of electric field gradually increased as voltage rose and decreased with increasing heat flux.For pool boiling heat transfer on plate surface immersed in ether, the enhancement effect of electric field gradually increased as voltage rose at heat flux q=5—9 kW·m-2.At the other testing heat flux(q≥10 kW·m-2), the increase of pool boiling heat transfer coefficient by applying electric field was much less.In the experimental condition, the enhancement effect of electric field on pool boiling heat transfer decreased with increasing heat flux.展开更多
基金Projects(51671152,51304153)supported by the National Natural Science Foundation of China
文摘The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement. The effects on absorption coefficient were systematically assessed. The results show that the sound absorption performance is improved by increasing the sample porosity and/or thickness, and/or increasing the air-cavity thickness. Meanwhile, increasing the temperature gives better acoustic absorption performance in the low frequency range but also lowers the performance in the high frequency range, while double-layer structure enables better acoustic absorption performance.
文摘The electric field enhancement of natural convection and pool boiling heat transfer on a plate surface immersed in ether was investigated.The experimental data indicated that electric field could enhance natural convection and pool boiling heat transfer.The enhancement effect of electric field on natural convection heat transfer was larger than the effect on pool boiling heat transfer.For natural convection heat transfer on plate surface immersed in ether,the enhancement effect of electric field gradually increased as voltage rose and decreased with increasing heat flux.For pool boiling heat transfer on plate surface immersed in ether, the enhancement effect of electric field gradually increased as voltage rose at heat flux q=5—9 kW·m-2.At the other testing heat flux(q≥10 kW·m-2), the increase of pool boiling heat transfer coefficient by applying electric field was much less.In the experimental condition, the enhancement effect of electric field on pool boiling heat transfer decreased with increasing heat flux.
