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Roland Paterson-Jones
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 Posted: Sun Aug 10, 2003 3:15 am Post subject: Viscosity of HC mixture? |
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Is there an easy way to predict the viscosity of a mixture of hydrocarbons,
perhaps according to their individual viscosities?
The domain of interest is hydrocarbon fuels (i.e. pure hydrocarbons, but
also commercial gasoline, diesel, kerosine, etc.), and vegetable oils such
as sunflower, rape-seed. I>d also like to extend this to oxygenated
hydrocarbons such as methanol and ethanol.
Is there a more general way to predict viscosities of (multi) fluid
solutions, according to their individual properties?
Are viscosities linearly additive (i.e. a 50-50 solution of low-viscosity
and high-viscosity fluid would have a viscosity exactly mid-way between the
two). Do viscosities of solutions tend towards the least or the most
viscous?
Thanks for any help
Roland
--
Roland and Lisa Paterson-Jones
Forest Lodge, Stirrup Lane, Hout Bay
http://www.rolandpj.com/forest-lodge
mobile: +27 72 386 8045
e-mail: forest-lodge@rolandpj.com |
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Uncle Al
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| Posted: Sun Aug 10, 2003 5:45 am Post subject: Re: Viscosity of HC mixture? |
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Roland Paterson-Jones wrote:
[quote]
Is there an easy way to predict the viscosity of a mixture of hydrocarbons,
perhaps according to their individual viscosities?
The domain of interest is hydrocarbon fuels (i.e. pure hydrocarbons, but
also commercial gasoline, diesel, kerosine, etc.), and vegetable oils such
as sunflower, rape-seed. I>d also like to extend this to oxygenated
hydrocarbons such as methanol and ethanol.
Is there a more general way to predict viscosities of (multi) fluid
solutions, according to their individual properties?
Are viscosities linearly additive (i.e. a 50-50 solution of low-viscosity
and high-viscosity fluid would have a viscosity exactly mid-way between the
two). Do viscosities of solutions tend towards the least or the most
viscous?
Thanks for any help
Roland
[/quote]
Inert small molecules might mole weight-average properties near
enough. Long molecules can bundle or extend (look up "theta solvent")
and tangle. Functionalized stuff can interact (fumed silica in
hydrocarbon, organic gelants in near anything, amines plus alcohols
and hydrogen bonding). Paraffins go weird near pour points by network
formation. Consider co-solvent properties among paraffins,
microcrystalline waxes, naphthenes, aromatics...
It depends.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net! |
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Roland Paterson-Jones
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| Posted: Sun Aug 10, 2003 7:52 am Post subject: Re: Viscosity of HC mixture? |
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"Thiophilus" <Thiophilus@fake.com> wrote in message
news:24bbjv06bvi8spojcslqhd60shdj0d1775@4ax.com...
[quote]roland@rolandpj.com> wrote:
Is there an easy way to predict the viscosity of a mixture of
hydrocarbons,
perhaps according to their individual viscosities?
Check out API Procedure 11A4.3. It is a method to blend viscosities of
two hydrocarbon components. The method has been extended to 30
components by Luinstra - see Hydrocarbon Processing, 1983.
[/quote]
What and where is API Procedure 11A4.3?
Roland
--
Roland and Lisa Paterson-Jones
Forest Lodge, Stirrup Lane, Hout Bay
http://www.rolandpj.com/forest-lodge
mobile: +27 72 386 8045
e-mail: forest-lodge@rolandpj.com |
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Roland Paterson-Jones
Guest
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| Posted: Sun Aug 10, 2003 8:05 am Post subject: Re: Viscosity of HC mixture? |
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"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:3F3595BE.8F5750E0@hate.spam.net...
[quote]Roland Paterson-Jones wrote:
Is there an easy way to predict the viscosity of a mixture of
hydrocarbons,
perhaps according to their individual viscosities?
Inert small molecules might mole weight-average properties near
enough. Long molecules can bundle or extend (look up "theta solvent")
and tangle. Functionalized stuff can interact (fumed silica in
hydrocarbon, organic gelants in near anything, amines plus alcohols
and hydrogen bonding). Paraffins go weird near pour points by network
formation. Consider co-solvent properties among paraffins,
microcrystalline waxes, naphthenes, aromatics...
[/quote]
Al, don>t go bezerk, most of the time my molecules are just hanging out. I>m
limiting my domain to straight hydrocarbons (HC>s) and standard mixes
thereof (gasoline, diesel fuel).
I>d like to bundle, extend, or even tangle with you, but I>d settle for a
simple formula for my viscosity.
Thanks
Roland
--
Roland and Lisa Paterson-Jones
Forest Lodge, Stirrup Lane, Hout Bay
http://www.rolandpj.com/forest-lodge
mobile: +27 72 386 8045
e-mail: forest-lodge@rolandpj.com |
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Thiophilus
Guest
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| Posted: Sun Aug 10, 2003 8:45 am Post subject: Re: Viscosity of HC mixture? |
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On Sun, 10 Aug 2003 04:52:21 +0200, "Roland Paterson-Jones"
<roland@rolandpj.com> wrote:
[quote]"Thiophilus" <Thiophilus@fake.com> wrote in message
news:24bbjv06bvi8spojcslqhd60shdj0d1775@4ax.com...
roland@rolandpj.com> wrote:
Is there an easy way to predict the viscosity of a mixture of
hydrocarbons,
perhaps according to their individual viscosities?
Check out API Procedure 11A4.3. It is a method to blend viscosities of
two hydrocarbon components. The method has been extended to 30
components by Luinstra - see Hydrocarbon Processing, 1983.
What and where is API Procedure 11A4.3?
[/quote]
API = American Petroleum Institute. API has published many books over
the years, including some fat reference volumes. This includes the
well-known API Technical data book. The procedure might be in there, I
don>t remember. Go to a university library and browse around.
Thiophilus |
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John Popelish
Guest
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| Posted: Sun Aug 10, 2003 8:49 am Post subject: Re: Viscosity of HC mixture? |
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Uncle Al wrote:
[quote]
Roland Paterson-Jones wrote:
Is there an easy way to predict the viscosity of a mixture of hydrocarbons,
perhaps according to their individual viscosities?
The domain of interest is hydrocarbon fuels (i.e. pure hydrocarbons, but
also commercial gasoline, diesel, kerosine, etc.), and vegetable oils such
as sunflower, rape-seed. I>d also like to extend this to oxygenated
hydrocarbons such as methanol and ethanol.
Is there a more general way to predict viscosities of (multi) fluid
solutions, according to their individual properties?
Are viscosities linearly additive (i.e. a 50-50 solution of low-viscosity
and high-viscosity fluid would have a viscosity exactly mid-way between the
two). Do viscosities of solutions tend towards the least or the most
viscous?
Thanks for any help
Roland
Inert small molecules might mole weight-average properties near
enough. Long molecules can bundle or extend (look up "theta solvent")
and tangle. Functionalized stuff can interact (fumed silica in
hydrocarbon, organic gelants in near anything, amines plus alcohols
and hydrogen bonding). Paraffins go weird near pour points by network
formation. Consider co-solvent properties among paraffins,
microcrystalline waxes, naphthenes, aromatics...
It depends.
[/quote]
People hate it when reality is complicated. Oh well...
--
John Popelish |
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Terry Wilder
Guest
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| Posted: Tue Aug 12, 2003 5:44 am Post subject: Re: Viscosity of HC mixture? |
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"Roland Paterson-Jones" <roland@rolandpj.com> wrote in message
news:3f35b67d$0$229@hades.is.co.za...
[quote]"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:3F3595BE.8F5750E0@hate.spam.net...
Roland Paterson-Jones wrote:
Is there an easy way to predict the viscosity of a mixture of
hydrocarbons,
perhaps according to their individual viscosities?
Inert small molecules might mole weight-average properties near
enough. Long molecules can bundle or extend (look up "theta solvent")
and tangle. Functionalized stuff can interact (fumed silica in
hydrocarbon, organic gelants in near anything, amines plus alcohols
and hydrogen bonding). Paraffins go weird near pour points by network
formation. Consider co-solvent properties among paraffins,
microcrystalline waxes, naphthenes, aromatics...
Al, don>t go bezerk, most of the time my molecules are just hanging out.
I>m
limiting my domain to straight hydrocarbons (HC>s) and standard mixes
thereof (gasoline, diesel fuel).
I>d like to bundle, extend, or even tangle with you, but I>d settle for a
simple formula for my viscosity.
Thanks
Roland
--
Roland and Lisa Paterson-Jones
Forest Lodge, Stirrup Lane, Hout Bay
http://www.rolandpj.com/forest-lodge
mobile: +27 72 386 8045
e-mail: forest-lodge@rolandpj.com
[/quote]
Well you could always decide to try to calculate the london and van der
waals forces! |
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