The energy dissipation caused by the viscous force has great effects on the flow property of semi-solid metal during rheological processes such as slurry preparing, delivering and cavity filling. Experimental results in this paper indicate that the viscous friction between semi-solid metal and pipe wall, the collisions among the solid particles, and the liquid flow around particles are the three main types of energy dissipation. On the basis of the hydromechanics, the energy dissipation calculation model is built. It is demonstrated that the micro-structural parameters such as effective solid fraction, particle size and shape, and flow parameters such as the mean velocity, the fluctuant velocity of particles and the relative velocity between the fluid and solid phase, affect the energy dissipation of semi-solid metal.
参考文献
| [1] | K P Young;M C Flemings .[J].Metals Tech,1979,6(04):130. |
| [2] | X F Pan;H F Zhang;A M Wang .[J].Journal of Materials Science and Technology,2000,16(05):453. |
| [3] | I Diewwanit;M C Flemings.[A].UK,1996:30-34. |
| [4] | M Mada;F Ajersch .[J].Material Science and Engineering,1996,A212:171. |
| [5] | H B Dong;Y L Kang .[J].Journal of Materials Science and Technology,2003,19(zk):62. |
| [6] | Xiaobao ZHAO.Fluid Mechanics in Engineering[M].南京:东南大学出版社,2004:94-95. |
| [7] | Wenjuan XU.Fluid Mechanics[M].哈尔滨:哈尔滨工业大学出版社,2002:100-121. |
| [8] | W M Mao;Z S Zhen;S J Yan .[J].Journal of Materials Science and Technology,2004,20(05):580. |
| [9] | J Happel;H Brenner.Low Reyholds Number Hydrodynamics[M].Noord Hoff,Leyden,1973 |
| [10] | A S Kuwabara .[J].J Phys Sci Soc Jpn,1979,14 |
| [11] | Yuanjun ZHANG.Fluid Mechanics Encyclopedia[M].北京:北京航空航天大学出版社,1998:117-119. |
| [12] | Zhuoru CHEN.Fluid Mechanics in Engineering[M].哈尔滨:哈尔滨工业大学出版社,1987:125-130. |
| [13] | Jinren NI;Guangqian WANG.Basic Theory and New application of Fluid-solid Two-phase Flows[M].北京:科学出版社,1991:328-330. |
| [14] | Brown.Unit Operations[M].John Wiley and Sons Inc,New York,1950 |
| [15] | Hougen LU.Introduction of Micromeritics[M].上海:同济大学出版社,1997:40-42. |
| [16] | Nan WANG.Microscopic Structure and Rheological Behavior of Semi-solid Alloys[M].Nanjing Industrial College,1988:80-82. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%