Friction Reynold's number vs Bulk Reynold's number

aliabdullahnust · December 16, 2022, 03:57

What is the relationship between Friction Reynold's number vs Bulk Reynold's number?

Can we calculate friction Reynold's number if the bulk Reynold's number is known, if yes then how? Because the formula for friction Reynolds number invovle a derivative of velocity.

sbaffini · December 16, 2022, 05:38

Chapter 7 in Turbulent Flows by Pope covers it very well. You want to read that over anything possibly written here.

The answer, however, is no, not without assumptions. And even in that case, most times you would also need to solve a non linear equation

December 16, 2022, 03:57	Friction Reynold's number vs Bulk Reynold's number	#1
aliabdullahnust New Member Ali Abdullah Join Date: Aug 2018 Posts: 3 Rep Power: 7	What is the relationship between Friction Reynold's number vs Bulk Reynold's number? Can we calculate friction Reynold's number if the bulk Reynold's number is known, if yes then how? Because the formula for friction Reynolds number invovle a derivative of velocity.

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December 16, 2022, 05:38		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,168 Blog Entries: 29 Rep Power: 39	Chapter 7 in Turbulent Flows by Pope covers it very well. You want to read that over anything possibly written here. The answer, however, is no, not without assumptions. And even in that case, most times you would also need to solve a non linear equation