Friction and pressure drop in a steam pipe

[archioll]

Hi I am new to fluid mechanics and I wondering if anyone can explain to me in very simple terms why friction causes pressure loss when steam is moving through a pipe? I thought the friction would slow down the fluid which will lead to higher pressure but it seems its the opposite. I was trying to use Bernoulli's equation to see if I could figure it out but I couldn't.
Thanks very much

 

[russ_watters]

Welcome to PF!

The fluid loses energy to friction. Higher pressure would mean the fluid has more energy, not less. Also, if it were to slow down, it would accumulate. It has to have the same mass flow rate everywhere in the pipe (if it is a constant radius, of course).