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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: oj.bulmer

Forum: FLUENT June 3, 2013, 06:49

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Let me ask you a simple question, is the... Let me ask you a simple question, is the following statement right? "In a real perforated sheet, the fuel can pass in normal direction but not in transverse direction. So the loss in normal...

Forum: FLUENT May 31, 2013, 04:35

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Like I said, since the hole is opaque in all two... Like I said, since the hole is opaque in all two directions and open in only one, it is recommended that the transverse multiplier of 1000 should be used, as ANSYS documentation mentions. If...

Forum: FLUENT May 29, 2013, 14:47

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Your images do not exactly tell your story. Can... Your images do not exactly tell your story. Can you clearly show where is the passing stream? Also, for some reason, I think that your second image is a bit dodgy, and unrealistic. Why the velocity...

Forum: FLUENT May 29, 2013, 10:30

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Guo, B. Y., et al. "Numerical modelling of the... Guo, B. Y., et al. "Numerical modelling of the gas flow through perforated plates." Chemical Engineering Research and Design (2012). You mean 60% open area? How can you check the effect of...

Forum: FLUENT May 28, 2013, 06:54

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer You should be careful here. Yes porous jump can... You should be careful here. Yes porous jump can be used in 3D problems, but it is more relevant only when the flow is incident at normal angle. Please understand that regardless of how the flow is...

Forum: FLUENT May 4, 2013, 10:37

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer That is what porous jump does, by introducing a... That is what porous jump does, by introducing a source term of negative pressure gradient in momentum equations. Value of C2 is derived from Idelchik values. OJ

Forum: FLUENT April 30, 2013, 04:17

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Okay, I admittedly generalized a situation a... Okay, I admittedly generalized a situation a bit! I typically work with applications where the Reynolds number is high (in excess of 1e5). In such cases, the contribution due to viscous effects is...

Forum: FLUENT April 29, 2013, 11:53

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer I think I would disagree. Idelchik's values are... I think I would disagree. Idelchik's values are based on the the given percentage open area, thus giving us the loss coefficient for that open area, ie the ratio of dynamic to static head. Since...

Forum: FLUENT April 29, 2013, 10:00

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Indeed, and hence I used the prefix "if you are... Indeed, and hence I used the prefix "if you are happy to use" :) In case if you aren't happy, you could use the 3d porous model. Since perforated sheet doesn't have any flow in transverse...

Forum: FLUENT April 29, 2013, 09:10

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer If you are happy to use "porous jump", then only... If you are happy to use "porous jump", then only one coefficient (C2) needs to be specified, which can be easily calculated from the value of Idelchik OJ

Forum: FLUENT April 29, 2013, 09:05

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer Wouldn't this be computationally extremely... Wouldn't this be computationally extremely expensive? Even the mesh independence study will require significant time and effort! OJ

Forum: FLUENT April 29, 2013, 05:22

Replies: 39 PERFORATED PLATES Views: 13,372 Posted By oj.bulmer The only chance you have got is to select a small... The only chance you have got is to select a small symmetrical element of perforated sheet with few holes, and simulate at your angle to find out the resistance coefficient. This you can further use...

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