2006年9月 的存档

Joined iMechanica.org

2006年9月13日 2 条评论

A blog/web for mechanics, former one known as Applied mechanics news.
Link as: http://imechanica.org/
The new one is running by Harvard University. Till now, most of the posters are writen by "Chinese" mechanicians. This is a very good idea to have a internet community to post and discuss new ideas, and maybe know different people.

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Three possible directions of further research on packed beds...

2006年9月13日 3 条评论

There are three possible directions in the futher work on thermomechanical modelling of pebble beds, but the discussion with my supervisor is needed first. These ideas are seperated, but still in the same framework.

1. Thermal contact conductance model, and its application in HELICA mock-up.
The first simulation has been carried out. The influences have been estimated by current TCC model, while for beryllium pebbles, the pebble-wall interactions are more significant.

2. Thermal conductivity of packed beds, with the consideration of temperature.
The basic of this activity can be traced back to 1970s-1980s, a professor (Schlunder) in University of Karlsruhe developed one model (SZB) describing the solid-gas conductivity, which consists well with existing experimental data. But, there are many other important facts to be taken into account, such as the pressure effects developed by Chan and Tien. And in the late 90s, the DEM has been used in different cases, but the theoretical work can be reconsidered and can surely predict more gerneral problems.

3. Failure analysis of packed beds, and analysis of single pebble compaction experiments.
First case has been simulated to find out the difference between Hertz solution and exact multi contact situations. But the current results show that the comparison with experiments is not so well, and the reason should be found first. An research assistant is needed for this project for systematic simulation on contacts.

Posted by Yang Yu

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2006年9月11日 没有评论





会议之后,有一个实验室参观的项目,NRG Petten可以实现材料中子辐照后的性能研究。因此实验室也是有一定放射性的,进出都需要检查。检查的机器是德国产品,没有问题就是“nicht contaminate”。不过人家老员工说,工作几十年,一直没有听过另外一个结果。进实验室需要穿防护服,比较夸张,想来幸好只是参观。


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2006年9月2日 1 条评论

下周,9月5日从Karlsruhe出发到荷兰Petten,经Amsterdam、Alkmaar。会议为6~8日,结束后直接回Karlsruhe。会议举办方,这一次是荷兰核技术研究与咨询中心(NRG, The nuclear research and consultancy group),位于荷兰Petten,从地图上看就在海边,应该是荷兰几世纪前围海造田的区域之内。


CBBI: 14th International Workshop on Ceramic Breeder Blanket Interaction
Hotel: Golden Tulip Jan van Scorel

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