Sludge Viscocity
Sludge Viscocity
(OP)
Hi all,
I'm a process modeller working in the UK water industry. I'm looking at pre-pasteurisation technologies, which involve cooking the sludge up to 70 degC! The problem is that I don't know what happens to the laminar and turbulent velocity functions at such a high temperature! My worry is that the sludge will turn marmeladey and block up the heat exchangers / pipework and be really viscous! Does anybody know of a reference paper on viscocity of hot sludge? The old WRC TR185 (1983) equation is only valid up to 25 degC!
Cheers
MadC
I'm a process modeller working in the UK water industry. I'm looking at pre-pasteurisation technologies, which involve cooking the sludge up to 70 degC! The problem is that I don't know what happens to the laminar and turbulent velocity functions at such a high temperature! My worry is that the sludge will turn marmeladey and block up the heat exchangers / pipework and be really viscous! Does anybody know of a reference paper on viscocity of hot sludge? The old WRC TR185 (1983) equation is only valid up to 25 degC!
Cheers
MadC





RE: Sludge Viscocity
Vkin (kinematic viscosity) of water:
@ 60^C = 4.78 * 10^-7 m^2/s
@ 80^C = 3.66 * 10^-7 m^2/s
Usually sludge doesn't get thick if warmed up, not until 100^C (of course!), quite the contrary happens - it gets less viscous! Good luck!
RE: Sludge Viscocity
Suggest you may need to do somework on the sludge in your domain and research the data you seek.
A paper by Hisashi Murakami, Hideaki Katayama & Hidetsugu Matsuura covered a great del of information but this was all at 20 C. They may have or know of other researches who have datat that you seek. Good luck.