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Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
The momentum of the polymer particles is given by mass*velocity.
Forces are created by a change in momentum according d(mv)/dt (Newton’s law)
However, a change in momentum is not necessarily a transfer of energy whereby heat is generated.
(f.i. a mass swinging around on the end of a rope is accelerated into a circle and is without energy transfer involved)
Therefore it is better to look at the kinetic energy (1/2.m.v^2) that is converted into heat during a not 100% elastic collision.
Anyway, the available energy is directly related to the velocity.
My assumption, however, is that the kinetic energy, which is transferred into heat (temperature rise) is not enough to increase the polymer (even locally) to the softening temperature (even at rather high velocities).
see my previous consideration.
Are there any research reports that address the mechanism of the formation of streamers, supported by measurements and theoretical calculations, rather than statistical observations?
much interested in your opinion,
Best regards
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
The momentum of the polymer particles is given by mass*velocity.
Forces are created by a change in momentum according d(mv)/dt (Newton’s law)
However, a change in momentum is not necessarily a transfer of energy whereby heat is generated.
(f.i. a mass swinging around on the end of a rope is accelerated into a circle and is without energy transfer involved)
Therefore it is better to look at the kinetic energy (1/2.m.v^2) that is converted into heat during a not 100% elastic collision.
Anyway, the available energy is directly related to the velocity.
My assumption, however, is that the kinetic energy, which is transferred into heat (temperature rise) is not enough to increase the polymer (even locally) to the softening temperature (even at rather high velocities).
see my previous consideration.
Are there any research reports that address the mechanism of the formation of streamers, supported by measurements and theoretical calculations, rather than statistical observations?
much interested in your opinion,
Best regards
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
Dear Teus,
My studies show that streamer generation is related to the term PV (Pressure* Velocity), not the velocity alone.
Yes, these results are based on lab work, not on theory..
Regards,
Amrit ■
Re: Design Calculations For Pneumatic Conveying
Dear Teus,
My studies show that streamer generation is related to the term PV (Pressure* Velocity), not the velocity alone.
Yes, these results are based on lab work, not on theory..
Regards,
Amrit ■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
Lab work is based on a theory and/or always results in a (more valid) theory.
The physical effects of the velocity (I assume solid velocity) is addressed in your earlier reply and can be calculated and tested on their validity.
When PV (pressure*velocity) is a better parameter to consider in relation to streamer generation, what are the physical effects of the pressure in the accompanying theory?
In the term “PV (pressure*velocity)”, I assume that “pressure” is the local gas pressure.
Is the “velocity” in the term the gas velocity or the solid velocity?
“gas pressure*gas velocity” is in combination with a pipe area representing a power (N/m2 * m/sec * m2 = Nm/sec)
“gas pressure*solid velocity” does not make much sense as a physical parameter, although the general theory, given in your previous reply, is based on the solid velocity.
Now the theory, based on the solid velocity, is extended with the gas pressure and the solid velocity is replaced by the gas velocity.
I am very much interested to understand the full story.
Thanks and have a nice day
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
Lab work is based on a theory and/or always results in a (more valid) theory.
The physical effects of the velocity (I assume solid velocity) is addressed in your earlier reply and can be calculated and tested on their validity.
When PV (pressure*velocity) is a better parameter to consider in relation to streamer generation, what are the physical effects of the pressure in the accompanying theory?
In the term “PV (pressure*velocity)”, I assume that “pressure” is the local gas pressure.
Is the “velocity” in the term the gas velocity or the solid velocity?
“gas pressure*gas velocity” is in combination with a pipe area representing a power (N/m2 * m/sec * m2 = Nm/sec)
“gas pressure*solid velocity” does not make much sense as a physical parameter, although the general theory, given in your previous reply, is based on the solid velocity.
Now the theory, based on the solid velocity, is extended with the gas pressure and the solid velocity is replaced by the gas velocity.
I am very much interested to understand the full story.
Thanks and have a nice day
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
A gracious thank you to Teus Tuinenburg, Amrit Agarwal, and Sven Ludwig for commenting on my question.
Let me recast my question this way - given a fixed conveying system, with all conveying parameters/velocities/pressures, etc remaining the same, which LDPE formula from our product wheel will be most prone to form fuzz, fines, and/or streamers? In other words, which properties of the LDPE are the most critical indicators of the propensity to form fuzz, fines, and/or streamers?
density (modulus, softness)?
yield stress?
softening point?
coefficient of friction against conveying system walls?
others?
Thanks again,
Kurt ■
Re: Design Calculations For Pneumatic Conveying
A gracious thank you to Teus Tuinenburg, Amrit Agarwal, and Sven Ludwig for commenting on my question.
Let me recast my question this way - given a fixed conveying system, with all conveying parameters/velocities/pressures, etc remaining the same, which LDPE formula from our product wheel will be most prone to form fuzz, fines, and/or streamers? In other words, which properties of the LDPE are the most critical indicators of the propensity to form fuzz, fines, and/or streamers?
density (modulus, softness)?
yield stress?
softening point?
coefficient of friction against conveying system walls?
others?
Thanks again,
Kurt ■
Re: Design Calculations For Pneumatic Conveying
Dear Kurt,
As long as it is not clearly investigated, how the streamers are formed, it is difficult to find a solution for this problem.
The most heard assumption is that the LDPE bonding is caused by heat, generated by friction.
It must be possible to test this theory outside a pneumatic conveying system and then relate the found energies to be existing also in the pneumatic conveying system.
Static electricity is one of the existing energies that need to be investigated too.
There are suggestions that moist air, preventing static electric build up, could be beneficial in this case.
This subject is discussed many times before and up till now, no satisfactory answer has emerged.
This should be an indication that the cause nor the real solution is found.
Correlating many pneumatic conveying installation calculations with the existence or non existence of streamers (if existing at all) did not show any correlation.
Success
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
Dear Kurt,
As long as it is not clearly investigated, how the streamers are formed, it is difficult to find a solution for this problem.
The most heard assumption is that the LDPE bonding is caused by heat, generated by friction.
It must be possible to test this theory outside a pneumatic conveying system and then relate the found energies to be existing also in the pneumatic conveying system.
Static electricity is one of the existing energies that need to be investigated too.
There are suggestions that moist air, preventing static electric build up, could be beneficial in this case.
This subject is discussed many times before and up till now, no satisfactory answer has emerged.
This should be an indication that the cause nor the real solution is found.
Correlating many pneumatic conveying installation calculations with the existence or non existence of streamers (if existing at all) did not show any correlation.
Success
Teus ■
Teus
Article
Please if armit or anybody can send me this interesting articles
My mail is diegobritezg@hotmail.com
regards to all ■
Article
Please if armit or anybody can send me this interesting articles
My mail is diegobritezg@hotmail.com
regards to all ■
Re: Design Calculations For Pneumatic Conveying
Kurt,
Of all the variables, melt index of the resin is most important.
Regards,
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Charleston, WV, USA
Email: polypcc@aol.com
Ph 304 346 5125 ■
Re: Design Calculations For Pneumatic Conveying
Kurt,
Of all the variables, melt index of the resin is most important.
Regards,
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Charleston, WV, USA
Email: polypcc@aol.com
Ph 304 346 5125 ■
Theory & Design Of Dilute Phase Pneumatic Conveying System
Dear Mr. Agarwal,
I got your copy on theory and design of dilute phase pneumatic conveying system. Being a neophyte in this area, I was thrilled and amazed while I was going through your article understanding each topic. Now, I can check and say the cause of problem of my pneumatic conveying system - supported with design computation.
Your article is very informative, easy to understand and a big help for neophyte practitioners like me. Thank you!
Sincerely,
Alex ■
Theory & Design Of Dilute Phase Pneumatic Conveying System
Dear Mr. Agarwal,
I got your copy on theory and design of dilute phase pneumatic conveying system. Being a neophyte in this area, I was thrilled and amazed while I was going through your article understanding each topic. Now, I can check and say the cause of problem of my pneumatic conveying system - supported with design computation.
Your article is very informative, easy to understand and a big help for neophyte practitioners like me. Thank you!
Sincerely,
Alex ■
Pneumatic Sizing
Thank you for this most comprehensive article written for everyone to understand. I will create a worksheet after completing my detailed review.
Thanks again for sharing your experience.
Regards,
Blowden ■
Pneumatic Sizing
Thank you for this most comprehensive article written for everyone to understand. I will create a worksheet after completing my detailed review.
Thanks again for sharing your experience.
Regards,
Blowden ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Amrit,
Thank you for a very informative article. As a conveyance system novice, it greatly helped my understanding of how these systems operate.
-Brent ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Amrit,
Thank you for a very informative article. As a conveyance system novice, it greatly helped my understanding of how these systems operate.
-Brent ■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
I am very interested in your article. Could you send me to check better?
Best Regards.
Rodrigo Sini ■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit,
I am very interested in your article. Could you send me to check better?
Best Regards.
Rodrigo Sini ■
Theory & Design Of Dilute Phase Pneumatic Conveying System
Dear mr Amrit Agarwal,
Thanks for the copy pof article. Its step by step approach for pneumatic conveying calculations is easy to follow. I am preparing the necessary worksheets after incorporating the equations and will write back if I faceany problem.
However, one immediate doubyt during my first reading is that for the equivalent length of 90° bend, long radius is given as "40, or 20 ft whichever is more". What does it mean? 40 is always more than 20, and then why you have taken it as 20 for the pellets conveying calculations?
Deenar Apte ■
Theory & Design Of Dilute Phase Pneumatic Conveying System
Dear mr Amrit Agarwal,
Thanks for the copy pof article. Its step by step approach for pneumatic conveying calculations is easy to follow. I am preparing the necessary worksheets after incorporating the equations and will write back if I faceany problem.
However, one immediate doubyt during my first reading is that for the equivalent length of 90° bend, long radius is given as "40, or 20 ft whichever is more". What does it mean? 40 is always more than 20, and then why you have taken it as 20 for the pellets conveying calculations?
Deenar Apte ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Dear Mr Amrit Agarwal,
Thank for you caption article sent to me. It gives the details calculation of the pneumatic conveying design. At the moment, I have generated the Excel worksheet and it works except minor deviation. Will post it to you for some queries later.
Regards,
KL Oo ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Dear Mr Amrit Agarwal,
Thank for you caption article sent to me. It gives the details calculation of the pneumatic conveying design. At the moment, I have generated the Excel worksheet and it works except minor deviation. Will post it to you for some queries later.
Regards,
KL Oo ■
Theory And Design Of Dilute Phase Conveying System
Dear Mister Agarwal
Many thanks for sending your article “Theory and Design of Dilute Phase Pneumatic Conveying Systems” in pdf-format.
At the first glance seems the calculation method very interesting and helpful. Anyway, the article is conveniently arranged. Of course I need some time to overview and to examine the matter. Unfortunately, it really is a pity because of the use of imperial units while most of the European countries calculate with SI units.
Best Regards
Danny ■
Theory And Design Of Dilute Phase Conveying System
Dear Mister Agarwal
Many thanks for sending your article “Theory and Design of Dilute Phase Pneumatic Conveying Systems” in pdf-format.
At the first glance seems the calculation method very interesting and helpful. Anyway, the article is conveniently arranged. Of course I need some time to overview and to examine the matter. Unfortunately, it really is a pity because of the use of imperial units while most of the European countries calculate with SI units.
Best Regards
Danny ■
Re: Design Calculations For Pneumatic Conveying
Dear Mr. Amrit,
I read your very useful articals on pneumatic systems and I would like to request a copy of your excel spreadsheet for "Theory and Design of Dilute Phase Pneumatic Conveying Systems". I'll also appreciate for your articals "Debottlenecking Pneumatic Conveying Systems" and "Product Quality in Pneumatic Conveying". Thanks in advance and all the best...
Serdar Ozmisirli
Sr. Process Engineer
Tasnee ■
Re: Design Calculations For Pneumatic Conveying
Dear Mr. Amrit,
I read your very useful articals on pneumatic systems and I would like to request a copy of your excel spreadsheet for "Theory and Design of Dilute Phase Pneumatic Conveying Systems". I'll also appreciate for your articals "Debottlenecking Pneumatic Conveying Systems" and "Product Quality in Pneumatic Conveying". Thanks in advance and all the best...
Serdar Ozmisirli
Sr. Process Engineer
Tasnee ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Dear Amrit,
I would like to thank you for the copy of your article. It is very well presented and easy to understand. I wish I had found you earlier as I just spent the better part of the last month compiling what amounts to about half of the information you present here.
I recommend this article as a first step (or second or twentieth step) to anyone plunging into the study of pneumatic conveyance.
Sincerely,
Justin Clark
Project / Sr. Design Engineer
Nordson Corp. ■
Theory And Design Of Dilute Phase Pneumatic Conveying Systems
Dear Amrit,
I would like to thank you for the copy of your article. It is very well presented and easy to understand. I wish I had found you earlier as I just spent the better part of the last month compiling what amounts to about half of the information you present here.
I recommend this article as a first step (or second or twentieth step) to anyone plunging into the study of pneumatic conveyance.
Sincerely,
Justin Clark
Project / Sr. Design Engineer
Nordson Corp. ■
Re: Design Calculations For Pneumatic Conveying
Dear Justin,
Compiling half the information of pneumatic conveying in the better part of the last month is really quite an achievement.
have a nice day
Teus ■
Teus
Re: Design Calculations For Pneumatic Conveying
Dear Justin,
Compiling half the information of pneumatic conveying in the better part of the last month is really quite an achievement.
have a nice day
Teus ■
Teus
Theory And Design Of Dilute Phase Pneumatic Conveying
Dear Mr Amrit Agarwal,
I receive your article and it is very useful and a practically approach method. I now generated the MS Excel the results are more or less same.
Can we combine the section 1 to 8 to ONE section and calculate?
Again thank you for sharing your knowledge.
Best Regards,
Kyi Lwin Oo ■
Theory And Design Of Dilute Phase Pneumatic Conveying
Dear Mr Amrit Agarwal,
I receive your article and it is very useful and a practically approach method. I now generated the MS Excel the results are more or less same.
Can we combine the section 1 to 8 to ONE section and calculate?
Again thank you for sharing your knowledge.
Best Regards,
Kyi Lwin Oo ■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit T. Agarwal
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit T. Agarwal
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
■
Re: Design Calculations For Pneumatic Conveying
I received your article and found it very interesting.
Helped me in some points where I was in doubt.
Thanks for your work.
Best Regards.
Rodrigo Sini
Brazil
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
■
Hi
Hi Amrit,
Can you please send me a copy of the calculation sheet to my mail id kiran.rao.k@gmail.com
Thanks,
Kiran Koppula ■
Re: Design Calculations For Pneumatic Conveying
Dear Sir,
We have a pneumatic conveying of lime system with lime of size -5mm, and bulk density of 1000kg/cu.m.. Material flow is 50 T/hr..I am trying to calculate parameters as per your Theory and Design of Dilute Phase Pneumatic Conveying Systems to ascertain and improve the system. I will be grateful if you could let me know value of K.
Best Regards ■
Re: Design Calculations For Pneumatic Conveying
Dear Kiran and Lotech,
Please send your requests by email to me. My email address is given below. Thank you.
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Charleston, WV, USA
Email: polypcc@aol.com
Ph 304 346 5125 ■
Re: Design Calculations For Pneumatic Conveying
What will be values of Vg and Vp in the formula for burnt lime -5mm, bulk density 1000 kg/cu.m. ■
Re: Design Calculations For Pneumatic Conveying
Dear Lotech,
Use the Rizk Equation to calculate the value of Vp and then add a 50% safety factor to the calculated value for design purposes.
Vg = 0.8 x Vp. This 0.8 factor should be close enough for coarse and relatively heavy particles.
Regards,
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Charleston, WV, USA
Email: polypcc@aol.com
Ph 304 346 5125 ■
Re: Design Calculations For Pneumatic Conveying
Dear Amrit, Iotech (not Lotech)
Sometimes a rule of thumb tells more than it seems at first instance.
Vproduct = 0.8 x vgas (Not vgas = 0.8 * vproduct)
Assume vertical pneumatic conveying.
then
vproduct=vgas – v suspension
vproduct/vgas = 1 – v suspension/vgas = 0.8
thus
v suspension/vgas = 0.2
Resulting in:
vgas = 5 times v suspension.
Exactly the same basis, how I estimate the airflow to begin with depending on particle size.
Calculating the product velocity in the design is a step further.
Have a nice day
Teus ■
Teus
Thanks
Hi Amrit,
Thanks for the copy of calculations on pneumatic conveying.
Thanks,
Kiran
kiran.rao.k@gmail.com ■
Re: Design Calculations For Pneumatic Conveying
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
Dear Mr. Amrit,
I would like to thank you for sending this very useful article "Debottlenecking Pneumatic Conveying Systems" which gives very good understanding to phenomena. I believe that the article is a very good starting point while focusing pneumatic bottlenecks. I wish you success for your further studies and I'll appreciate if you send your ""Theory and Design of Dilute Phase Pneumatic Conveying Systems" article as well.
Best regards
Serdar ■
Re: Design Calculations For Pneumatic Conveying
Hi Amrit,
Can you please send me a copy of the calculation sheet to my mail adress?
erica.risimini@gmail.com
Thanks, best regards,
Erica Risimini
PS - I got a question, can i ask it to you by email? Thank you a lot! ■
Re: Design Calculations For Pneumatic Conveying
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
Dear Mr. Amrit,
Thank you for your article "Theory and Design of Dilute Phase Pneumatic Conveying Systems". Article is very useful and very user friendly for calculation. I hope we can see your very useful future studies.
Best regards
Serdar Ozmisirli
Senior Process Engineer ■
Re: Design Calculations For Pneumatic Conveying
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
Dear Mr. Amrit,
Thank you for your article "Theory and Design of Dilute Phase Pneumatic Conveying Systems". Article is very useful and very user friendly for calculation. I hope we can see your very useful future studies.
Best regards
Serdar Ozmisirli
Senior Process Engineer ■
Design Calculations for Pneumatic Conveying
My article "Theory and Design of Dilute Phase Pneumatic Conveying Systems" was published this month in
href="https://who.bulk-online.com/profile/2-reinhard-h-wohlbier.html" target="blank">Powder Handling and Processing magazine. This article gives an easy to use Excel-based calculation method for designing new dilute phase pneumatic conveying systems or for improving the performance of existing conveying systems.
Regards,
Amrit T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email:
href="mailto:polypcc@aol.com">polypcc@aol.com
Ph and Fax: 304 346 5125
Picture added by Adinistrator as an example:
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