Title: Calculation of surface power density at bottom of crack between innerwall tiles
1 Calculation of surface power density atbottom of crack between inner-wall tiles
March 4 2005
2 qT tan-1(y/D) _at_ y/D y D qT qF tan-1(y/F) _at_ y/F qT(D/F) qF tan-1(y/F) _at_ y/F D Dq qF - qT Inner wall y qT qF DNB CL F grid seff F400 D 450 Þ seff 8s 4.4o qT 1.02o 3 In the limit where the inner wall and the DNB focal point are co-located the angular distribution of power is a square wave. 4 Power from right min (0.5 (0.5w-x)/dqTmax) Powe r from left min(0.5 (0.5wx)/dqTmax) dqTmax x d qTmax w If we define a crack angle qc º w/d then Total power density min(0.5 (qc/qTmax)(0.5-x/w) min(0.5 (qc/qTmax)(0.5-x/w)
5 Surprise !!! Power density at center of bottom of crack is equal to power density at upper tile surface The power density is not reduced by a factor like w/d so the heating problem at the bottom of the tile will be 30-40 times worse than we thought. Why Because the angular distribution of incident power is very narrow it is basically a square-wave with half-width 8/450 1.02o. Angular size of crack w/d 0.05/2 1.4o. Calculation for nominal parameters F 400 cm D 450 cm Crack depth 2.0 cm Crack witdh 0.05 cm
PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.
You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!
For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!