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viscosity for isopentane and pentane are incorrect #269
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First off, this is deprecated repository for CoolProp; issues should be
sent here: https://github.com/coolprop/coolprop/issues
Where is your data? :) CoolProp implements the models listed on each of
the info pages:
http://www.coolprop.org/fluid_properties/fluids/n-Pentane.html#fluid-n-pentane
and ECS with these parameters for isopentane:
http://www.coolprop.org/fluid_properties/fluids/Isopentane.html#fluid-isopentane
. Feel free to provide a better model, but I do not believe than any
exists.
…On Fri, Aug 25, 2017 at 9:56 AM, krule012 ***@***.***> wrote:
The calculated viscosity in coolprop for both isopentane and n-pentane
seems incorrect (specifically below 200 K). I would expect the viscosity
for isopentane to be greater than n-pentane at temperatures below 200 K. I
would also expect the gradient in viscosity to be larger for both pure
fluids below 200 K.
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Ian,
I observed a discrepancy between the calculated viscosity curve from
coolprop as compared with refprop. Unfortunately I am unable to provide a
better source for this calculation. Do you have a license for Refprop that
you could use to run a comparison?
I've been using coolprop extensively, no better free source for
thermophysical fluid properties exists (so far as I know). Thank you for
all of your contributions!
On Aug 27, 2017 1:05 PM, "Ian Bell" <notifications@github.com> wrote:
First off, this is deprecated repository for CoolProp; issues should be
sent here: https://github.com/coolprop/coolprop/issues
Where is your data? :) CoolProp implements the models listed on each of
the info pages:
http://www.coolprop.org/fluid_properties/fluids/n-Pentane.
html#fluid-n-pentane
and ECS with these parameters for isopentane:
http://www.coolprop.org/fluid_properties/fluids/Isopentane.
html#fluid-isopentane
. Feel free to provide a better model, but I do not believe than any
exists.
On Fri, Aug 25, 2017 at 9:56 AM, krule012 ***@***.***> wrote:
The calculated viscosity in coolprop for both isopentane and n-pentane
seems incorrect (specifically below 200 K). I would expect the viscosity
for isopentane to be greater than n-pentane at temperatures below 200 K. I
would also expect the gradient in viscosity to be larger for both pure
fluids below 200 K.
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Actually, I am now a developer of REFPROP. Do you know what models are
used in REFPROP for these two fluids?
…On Sun, Aug 27, 2017 at 4:00 PM, krule012 ***@***.***> wrote:
Ian,
I observed a discrepancy between the calculated viscosity curve from
coolprop as compared with refprop. Unfortunately I am unable to provide a
better source for this calculation. Do you have a license for Refprop that
you could use to run a comparison?
I've been using coolprop extensively, no better free source for
thermophysical fluid properties exists (so far as I know). Thank you for
all of your contributions!
On Aug 27, 2017 1:05 PM, "Ian Bell" ***@***.***> wrote:
First off, this is deprecated repository for CoolProp; issues should be
sent here: https://github.com/coolprop/coolprop/issues
Where is your data? :) CoolProp implements the models listed on each of
the info pages:
http://www.coolprop.org/fluid_properties/fluids/n-Pentane.
html#fluid-n-pentane
and ECS with these parameters for isopentane:
http://www.coolprop.org/fluid_properties/fluids/Isopentane.
html#fluid-isopentane
. Feel free to provide a better model, but I do not believe than any
exists.
On Fri, Aug 25, 2017 at 9:56 AM, krule012 ***@***.***>
wrote:
> The calculated viscosity in coolprop for both isopentane and n-pentane
> seems incorrect (specifically below 200 K). I would expect the viscosity
> for isopentane to be greater than n-pentane at temperatures below 200 K.
I
> would also expect the gradient in viscosity to be larger for both pure
> fluids below 200 K.
>
> —
> You are receiving this because you are subscribed to this thread.
> Reply to this email directly, view it on GitHub
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GogSiyD4jdPks5sbu7DgaJpZM4PC2Zu>
> .
>
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Based on the nature of your response, I would guess the same as Coolprop...
The curves I had referenced from Refprop we're from an older version (I
think v8 or v9). I had generated these back during my graduate research
work. I'll go ahead and update my model using the curves from coolprop
then.
Hopefully I didn't waste too much of your time.
I'll make sure to post any future issues at the link you provided below.
The help link I had used was from the "v4 documents" website.
On Aug 27, 2017 5:08 PM, "Ian Bell" <notifications@github.com> wrote:
Actually, I am now a developer of REFPROP. Do you know what models are
used in REFPROP for these two fluids?
On Sun, Aug 27, 2017 at 4:00 PM, krule012 ***@***.***> wrote:
Ian,
I observed a discrepancy between the calculated viscosity curve from
coolprop as compared with refprop. Unfortunately I am unable to provide a
better source for this calculation. Do you have a license for Refprop that
you could use to run a comparison?
I've been using coolprop extensively, no better free source for
thermophysical fluid properties exists (so far as I know). Thank you for
all of your contributions!
On Aug 27, 2017 1:05 PM, "Ian Bell" ***@***.***> wrote:
First off, this is deprecated repository for CoolProp; issues should be
sent here: https://github.com/coolprop/coolprop/issues
Where is your data? :) CoolProp implements the models listed on each of
the info pages:
http://www.coolprop.org/fluid_properties/fluids/n-Pentane.
html#fluid-n-pentane
and ECS with these parameters for isopentane:
http://www.coolprop.org/fluid_properties/fluids/Isopentane.
html#fluid-isopentane
. Feel free to provide a better model, but I do not believe than any
exists.
On Fri, Aug 25, 2017 at 9:56 AM, krule012 ***@***.***>
wrote:
> The calculated viscosity in coolprop for both isopentane and n-pentane
> seems incorrect (specifically below 200 K). I would expect the viscosity
> for isopentane to be greater than n-pentane at temperatures below 200 K.
I
> would also expect the gradient in viscosity to be larger for both pure
> fluids below 200 K.
>
> —
> You are receiving this because you are subscribed to this thread.
> Reply to this email directly, view it on GitHub
> <#269>, or mute the thread
> <https://github.com/notifications/unsubscribe-auth/ABxha5Cr8FbHAsyNxuAs-
GogSiyD4jdPks5sbu7DgaJpZM4PC2Zu>
> .
>
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The calculated viscosity in coolprop for both isopentane and n-pentane seems incorrect (specifically below 200 K). I would expect the gradient in viscosity to be larger for both pure fluids below 200 K. I don't have another data source that I can compare this to. Could you verify against pure fluid properties from NIST?
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