Thanks for the informative video, I learned something new today about what a rheometer is used for. It is used for to measure the force required to shear a liquid.
You are right. Using the proper theory, the rheometer can be used to find out the viscosity of the liquid such as a lubricating oil that you put in your car.
Very informative. For viscosity values shown in the table, should we exclude the measurement at point 1 as it gives a totally different value from points 2 to 20?
time 23:55. Yes you have pointed out an important aspect of the data collection. Often the initial couple data may be totally different and need to be omitted. Also, every test must be repeated at the same set of conditions three times, at least.
Thanks for asking. For pastes, extrusion based rheology can be used. Normal rheometer can not be used due to the problem of wall slip. Squeeze film test can also be used. This paper may help: www.sciencedirect.com/science/article/abs/pii/S0377025796015467 For paste we model as yield + Non-Newtonian or power law, for example, Herschel Bulkley model.👍
@@engineeringmaterials-tribo5142 sir i am a PhD research scholar working on a viscus ceramic paste struggling to analyse some of my sample but I cant find any rheometer system. will you help me sir.
@@debu326 I do not have such rheometer. Try extrusion or squeeze film compression methods of measuring. That is what I can say. There are many published such works in this field. My old research was in this field. You can check my old publications here. scholar.google.com/citations?user=aybvKicAAAAJ&hl=en I am sorry I can not help much. Best wishes 👍
You can only run thermoplastic polymer when it is in melt form. This machine is not suitable for that purpose. We can measure viscosity of standard oils.
The bituminous layer is highly viscous at normal temperatures but a higher temperatures it flows. This company makes instruments for bitumen at high temperature. For a very viscous liquid we can also use the capillary flow method (Saybolt) to measure kinematic viscosity.
Thanks for the video prof. I am recently starting a Master Thesis on Rheologie examination using very high shear rates, i am wondering the career prospects in the field, Will I be satisfied on this aspect ?
It depends which department you are in. Rheological studies are generally carried out for polymers, lubricants etc. If you have conducted your research well then you should definitely try in similar kind of companies. You will need broad domain knowledge of the department you are in.
Are engine oil and olive oil Newtonian fluids under all conditions of temperature? I would imagine that engine oil has some n-paraffin fractions that could form wax at certain temperatures, as is the case with diesel and some other distillate fuels. Was the Excel spreadsheet obtained directly from the viscometer software or some of the parameters were calculated from measured data?
Thanks. Both oil will turn very viscous at lower temperatures with non-Newtonian behaviour. Excel is directly obtained from the machine with columns of stress and strain rate data. So, it is easy to plot them and obtain viscosity.
If the yoghurt is easily flowable then the rheometer described in this video can be used. For yoghurt that does not flow like a fluid then perhaps you should conduct compression test, just like we do for cheese.
There were a lot of concepts related to rheology I was struggling to piece together. Thank you for making this so clear.
This helped me a lot! Starting my bachelors thesis next week 😅 thank you
Good luck!!
I am here for the same reason haha
Which topic ?
Thanks for the informative video, I learned something new today about what a rheometer is used for. It is used for to measure the force required to shear a liquid.
You are right. Using the proper theory, the rheometer can be used to find out the viscosity of the liquid such as a lubricating oil that you put in your car.
Thank you very well
Very informative. For viscosity values shown in the table, should we exclude the measurement at point 1 as it gives a totally different value from points 2 to 20?
time 23:55. Yes you have pointed out an important aspect of the data collection. Often the initial couple data may be totally different and need to be omitted. Also, every test must be repeated at the same set of conditions three times, at least.
Very informative video.
Sir how to do rheology of viscus paste.
Thanks for asking.
For pastes, extrusion based rheology can be used. Normal rheometer can not be used due to the problem of wall slip. Squeeze film test can also be used. This paper may help: www.sciencedirect.com/science/article/abs/pii/S0377025796015467
For paste we model as yield + Non-Newtonian or power law, for example, Herschel Bulkley model.👍
@@engineeringmaterials-tribo5142 sir i am a PhD research scholar working on a viscus ceramic paste struggling to analyse some of my sample but I cant find any rheometer system. will you help me sir.
@@debu326 I do not have such rheometer. Try extrusion or squeeze film compression methods of measuring. That is what I can say. There are many published such works in this field. My old research was in this field. You can check my old publications here. scholar.google.com/citations?user=aybvKicAAAAJ&hl=en
I am sorry I can not help much. Best wishes 👍
Dear Prof, have you run it for thermoplastic polymer?
You can only run thermoplastic polymer when it is in melt form. This machine is not suitable for that purpose. We can measure viscosity of standard oils.
Is it possible to find viscosity of existing bituminous layer of any road?
If yes, please elaborate !!
The bituminous layer is highly viscous at normal temperatures but a higher temperatures it flows. This company makes instruments for bitumen at high temperature. For a very viscous liquid we can also use the capillary flow method (Saybolt) to measure kinematic viscosity.
Thanks for the video prof. I am recently starting a Master Thesis on Rheologie examination using very high shear rates, i am wondering the career prospects in the field, Will I be satisfied on this aspect ?
It depends which department you are in. Rheological studies are generally carried out for polymers, lubricants etc. If you have conducted your research well then you should definitely try in similar kind of companies. You will need broad domain knowledge of the department you are in.
Are engine oil and olive oil Newtonian fluids under all conditions of temperature? I would imagine that engine oil has some n-paraffin fractions that could form wax at certain temperatures, as is the case with diesel and some other distillate fuels.
Was the Excel spreadsheet obtained directly from the viscometer software or some of the parameters were calculated from measured data?
Thanks. Both oil will turn very viscous at lower temperatures with non-Newtonian behaviour.
Excel is directly obtained from the machine with columns of stress and strain rate data. So, it is easy to plot them and obtain viscosity.
Hello Sir, Is this RheolabQC or different?
Anton Paar rheometer
@@engineeringmaterials-tribo5142 which model?
why TH-cam thought that this lecturer is speaking Hindi, while he spoke English. lol
May be because I uploaded the video in India.
Thank you very much Sir. But i would like to know about that how the viscosity of yogurt is tested.
If the yoghurt is easily flowable then the rheometer described in this video can be used. For yoghurt that does not flow like a fluid then perhaps you should conduct compression test, just like we do for cheese.
@@engineeringmaterials-tribo5142 . Thank you very much Sir. Now my mind is almost cleared.