Newtonian And Non-Newtonian Fluids || Newtonian and non-newtonian fluids in hindi || fluid mechanics
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- Опубліковано 30 кві 2020
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Newtonian And Non-Newtonian Fluids,
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A Newtonian fluid is a fluid in which the viscous stresses arising from its flow, at every point, are linearly[1] correlated to the local strain rate-the rate of change of its deformation over time.[2][3][4] That is equivalent to saying those forces are proportional to the rates of change of the fluid's velocity vector as one moves away from the point in question in various directions.
Newtonian fluids are the simplest mathematical models of fluids that account for viscosity. While no real fluid fits the definition perfectly, many common liquids and gases, such as water and air, can be assumed to be Newtonian for practical calculations under ordinary conditions. However, non-Newtonian fluids are relatively common, and include oobleck (which becomes stiffer when vigorously sheared), or non-drip paint (which becomes thinner when sheared). Other examples include many polymer solutions (which exhibit the Weissenberg effect), molten polymers, many solid suspensions, blood, and most highly viscous fluids.
Newtonian fluids are named after Isaac Newton, who first used the differential equation to postulate the relation between the shear strain rate and shear stress for such fluids.
A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid. Many salt solutions and molten polymers are non-Newtonian fluids, as are many commonly found substances such as custard,[1] honey,[1] toothpaste, starch suspensions, corn starch, paint, blood, melted butter, and shampoo.
Most commonly, the viscosity (the gradual deformation by shear or tensile stresses) of non-Newtonian fluids is dependent on shear rate or shear rate history. Some non-Newtonian fluids with shear-independent viscosity, however, still exhibit normal stress-differences or other non-Newtonian behavior. In a Newtonian fluid, the relation between the shear stress and the shear rate is linear, passing through the origin, the constant of proportionality being the coefficient of viscosity. In a non-Newtonian fluid, the relation between the shear stress and the shear rate is different. The fluid can even exhibit time-dependent viscosity. Therefore, a constant coefficient of viscosity cannot be defined.
Although the concept of viscosity is commonly used in fluid mechanics to characterize the shear properties of a fluid, it can be inadequate to describe non-Newtonian fluids. They are best studied through several other rheological properties that relate stress and strain rate tensors under many different flow conditions-such as oscillatory shear or extensional flow-which are measured using different devices or rheometers. The properties are better studied using tensor-valued constitutive equations, which are common in the field of continuum mechanics.
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Yes sir aapki hrr video bhot achii lagti hh merko orr sabse jaada smj aati hh apki videos thanku so much sir ji
Thanks sir , very appreciated
Thank you so much for this wonderful explanation 😊
Sr ki aawaj thoda thoda akhilesh yadav ji jaisi lgti h........ 😀
Yah bro
Bingham fluid ka example shayad toothpaste hoga. Usme thora sa load dena parhta h jo stress deta h fir jaakar strain hota h. Matlab jese singham shakt h, zyada jor h. Wese he bingham. Zyada jor dena parhta h.. SINGHAM-BINGHAM, aise yaad rehta h mujhe.
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Thank you sir
Thank you so much sir ji main aapki har video dekhta hu or bahut kuch sikhta hu 👍
Sir aap itna acha example de kar samjhate hai ki optional question kitna bhi ghuma diya jaye lekin mai sahi kar leta hu
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nice sir..
Thank you so much sir
No Doubt Left. You are brilliant sir .
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so easy sir
Sir ji fluid mechanics ka hydrostatic chapter ka vedio provide kra dijiye🙏Hummble request
Osm vedio..... Thnk u sir
Glad to help you 😀
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Practical shear strain in fluid btao sir
Thanks sir for explaining so easily which i did't understand in my class.
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Sir inke example bhi de dete. Baki apne bahut achchha samjhaya
You are the best teacher sir. Thanks sir🙏🙏
Yes
Shear Stress aur Strain ko Practical Water k paas jakar samjhaiye kaha par dikhti hai kaha work karti hai
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Thnk u 🤗 so much
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Excellent explain sir thank you so much ❤️❤️❤️
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60
What is shear stress???Explain this sir
And shear strain
ua-cam.com/video/zHnFJeLb5GM/v-deo.html
Does Newton's law of Viscosity applies to ideal fluid.?
No they are ideal it Don't have viscosity
u=0
Aman mewada
Water
Newtonian fluid hai
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