Leni k

Thank you for your reply...I have seen negative values in a paper that I read, but I thought it would be something wrong.

Good evening! Could anybody inform me in which circumstances the reynolds number takes low or negative values? Thank you!

Hello , I prepare my thesis whose subject is: simulation of vortex tube performance. I use a group of equations that have been referred on the thesis :''QUANTITATIVE OBSERVATIONS ON MULTIPLE FLOW STRUCTURES INSIDE RANQUE HILSCH VORTEX TUBE'', but i met some problems in the implementetion of them. Has anybody any idea about the coefficients of friction that are used in this thesis in the last pages? Thank you in advance.