Napkin ring problem - Wikipedia
Numerical simulation of a gas flow in a real geometry of random packed bed of Raschig rings - ScienceDirect
![Truly Singaporean Singapore Mathematics: [Enrich20161103NRP] The Napkin Ring Problem](https://4.bp.blogspot.com/-H9QLw4henXk/WBtQKXRXxHI/AAAAAAAACXY/CTivw9u0lRgxqaa5qSCCxZYN2htc9O4rACLcB/s1600/Napkin%2BRing%2BProblem%2B2.jpg "Truly Singaporean Singapore Mathematics: [Enrich20161103NRP] The Napkin Ring Problem")
Truly Singaporean Singapore Mathematics: [Enrich20161103NRP] The Napkin Ring Problem
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SOLVED: You are designing an absorption column for CO separation and you choose to use Raschig rings as packing materials. The Raschig rings are cylindrical in shape with the following dimensions: height
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