i have problem with viscous sublayer

From: <BABAK>
Date: Mon Aug 26 2002 - 05:50:00 EDT

hi!

can any body answer these quesiones?

here is that questiones:

when we protect internal of steel pipe lines with cement mortar lining it's very important for any engineer to calculate the value of friction factor or "c"H-W & you know these values depends on surface roughness. 1-how we can determine the value of these coefficiants for a new in-sith cement line pipe before hydrolic tests.
2-I read in some books & lectures that the viscous sublayer in turbulant flow decrease the roughness of surface in fully developed turbulant flow. how we can calculate the thicknass of viscous sublayer in this condition & is the thickness of viscous sublayer depends on type of lininwhen we protect internal of steel pipe lines with cement mortar lining it's very important for any engineer to calculate the value of friction factor or "c"H-W & you know these values depends on surface roughness. 1-how we can determine the value of these coefficiants for a new in-sith cement line pipe before hydrolic tests.
2-I read in some books & lectures that the viscous sublayer in turbulant flow decrease the roughness of surface in fully developed turbulant flow. how we can calculate the thicknass of viscous sublayer in this condition & is the thickness of viscous sublayer depends on type of lining or pipes?

thank you.

babak rad.

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[Non-text portions of this message have been removed] Received on Mon Aug 26 05:50:00 2002