Questions tagged [non-newtonian-fluids]

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Water coming out of a capillary tube when height is reduced below initial level

Consider a capillary tube of height $H_1$. Water raises to a height $h_1$ in this tube. Now the capillary tube is cut such that its new height is $H_2 < h_1$. I've read in many textbooks and other ...
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24 views

Question About Momentum Flux Analysis Using Force Equations In Fluid Mechanics

I was just revising fluid mechanics "Momentum Flux Analysis & Control Volumes" and I just noticed that there is an assumption in which we can assume to deal with gauge pressure instead ...
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2answers
57 views

Can centrifugal force exist in non-Newtonian mechanics?

Judging on the fact that there are certain non-Newtonian fluids, that behave in a way adverse to Newtonian Mechanics, such as oobleck, is there a way for the idea of centrifugal force to exist outside ...
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51 views

Is WD40 a Newtonian liquid?

Reading the technical specifications of WD40 it says that it has a quite high kinematic viscosity (i.e. very little viscous fluid) of 2.8 cST @38C. However reading through its revealed trade secret ...
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1answer
20 views

Why did why fluids long molecular chains more likely to have non-Newtonian properties?

I came across a sentence 'fluids with long molecular chains can react in a non-Newtonian manner' in Wikipedia of non-Newtonian fluids, and I did not understand where is the correlation between long ...
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2answers
25 views

Can the property of non-Newtonian fluid be controlled?

I understand that non-newtonian fluid could become solid under high shear rate. What I can't find online, is could we control at which shear rate the NNF would solidify? Like when an electrical field ...
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66 views

Why surface tension occurs [duplicate]

I have this confusion of surface tension, in my books it is written that surface tension occurs due to cohesive forces acting on the particles which makes them to contract. (If this is the case then ...
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0answers
43 views

Can an electrorheological non-Newtonian fluid be in a definite shape for a short time?

I have seen this Experiment: ELECTRORHEOLOGICAL FLUIDS and balloon Experiment (Stops flow with Static Electricity), and have seen that simple cornstarch is affected by electrostatic forces. The ...
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1answer
61 views

Why can shade-balls behave as quick sand?

So I came across this interesting video in which shade-balls were dropped into a swimming pool and people tried to swim around. Towards the end of the video, a smaller part of the pool is filled with ...
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3answers
3k views

How do I calculate Reynold's number for a non-newtonian fluid?

I am familiar with the known formula to find Reynold's number in a circular pipe for newtonian fluids: $$\text{Re} = \frac{\rho \bar{v}D}{\mu}$$ where $\rho$ is the density, $\bar{v}$ is the average ...
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0answers
143 views

Liquid sand: is it really a liquid?

This question follows the lead of a previous question (What kind of fluid is sand?), where basic properties of sand were discussed. A comment to that same question linked to a videoclip where sand ...
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1answer
786 views

Is quicksand a pseudoplastic or a dilatant fluid?

In the book "Munson and others -Fundamentals of Fluid Mechanics" (at least in my version translated to portuguese) it says that quicksand is a shear thickening fluid but in wikipedia and other sources ...
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53 views

Statistical mechanics arguments for the Newtonian stress-strain model in continuum mechanics

In traditional continuum mechanics, it can be shown using frame-invariance and the Cayley-Hamilton theorem that an isotropic, inelastic* fluid embedded in Galilean space-time must possess the ...
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1answer
105 views

A Hurschel-Bulkley fluid flows through a conical nozzle

I got an physical problem in paste extrusion that I am unable to solve: A pasty material flows through a conical nozzle. The material follows Hurschel-Bulkley flow model (H-B model): $\tau=\tau_y+...
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1answer
1k views

If fluids have zero shear modulus, how do I make sense of graphs like strain rate vs shear stress (to classify fluids as Newtonian or non-Newtonian)?

Following the definition on the wiki: Fluids are substances that have zero shear modulus, or, in simpler terms, a fluid is a substance which cannot resist any shear force applied to it. If fluids ...
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1answer
191 views

Variation Weight of vessels filled with same fluid [duplicate]

Three vessels having different shapes but having the same base area and same weight when empty , are filled with mercury to the same level. Neglecting the atmosphere , Statement-- On a weighing ...
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1answer
127 views

Would Lasagna be a non-Newtonian substance? [closed]

I was having a random discussion with some work colleagues, and we stumbled across the subject of lasagna (the dish, not just the noodles) being a non-Newtonian substance. My argument was that you ...