本文对烧结有厚度为30 mm的高孔隙率通孔铜泡沫的水平表面的池沸腾进行实验研究.并采用高速摄像仪对泡沫表面的汽泡生长形貌进行了可视化研究,研究了壁面过热度对热流密度、汽泡脱离直径、汽泡生长周期的影响关系.结果表明由于本文所研究的通孔泡沫厚度较大,限制了汽泡的脱离,使传热性能低于光表面,但是使沸腾起始点降低至3℃.
The pool boiling performance on a horizontal surface of high porosity copper foam with a thickness of 30 mm is experimentally studied.The bubble growth visualization in a nucleate boiling process is recorded by a high-speed camera.The influences of wall superheat on a wall heat flux,bubble growth cycle and bubble departure diameter are investigated.It reveals that the total nucleate pooling heat transfer coefficient is lower than that on a smooth surface since the foam thickness is too high to offer much friction force to bubble departure while wall superheat for the boiling starting point is reduced to 3℃.
参考文献
| [1] | 杨世铭;陶文铨.传热学[M].北京:高等教育出版社,1998 |
| [2] | Z. Wang;X. F. Peng;T. Liu .VISUALIZATION OF BOILING PHENOMENA IN A BEAD-PACKED STRUCTURE[J].Experimental heat transfer,2002(3):177-189. |
| [3] | WANG Z;PENG XF;Ochterbeck JM .Dynamic Bubble Behavior During Boiling in a Beadpacked Structures[J].International Journal of Heat and Mass Transfer,2004,47:4771-4783. |
| [4] | Cieslinski JT .Nucleate Pooi Boiling on Porous Metallic Coatings[J].Experimental Thermal and Fluid Science,2002,25:557-564. |
| [5] | Vemuri S;Kim KJ .Pool Boiling of Saturated FC-72 on Nano-porous Surface[J].Int Com Heat Mass Transfer,2005,32:27-31. |
| [6] | 刁彦华,赵耀华.R-141b池沸腾气泡行为的可视化及传热研究[C].中国工程热物理学会2004年传热传质学学术会议论文集(下册),2004:1083-1086. |
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