Home Physics Kaye Effect in Shampoos

Kaye Effect in Shampoos

Last updated on July 13th, 2020 at 08:40 pm

Well, how many of you love to play or experiment with shampoos and soaps? If you are one of them then this article is like a treat to you all.

We often hear that science is all around us in our day to day life and it is also very true. But, it is surprising to know that the small things we happen to ignore demonstrate basic laws of science in a practical way. In today’s article, we are going to discuss something that’s very common yet we fail to observe it.

Try it out

Pour a steady flow of shampoo from a height of 30cm about the surface. Make sure that you try to pour it at a single point itself. What is expected to be observed? A heap of shampoo on the surface, true but, it is also accompanied by something strange as well. Have a look-

Gif Credit : Imgur.com

Did you observe the mysterious and bizarre jet like steam coming out of the heap of shampoo? This is called Kaye Effect and is observed thin shear-thining fluids. By far in practical life, it has been observed in shampoos only, but other shear-thinning fluids may also show Kaye Effect under suitable conditions.

What is the Kaye Effect?

The Kaye effect was first reported in 1963 by British engineer Alan Kaye, who noticed this unusual behavior when working with complex organic liquids.  A complete explanation for this phenomenon remained uncertain until 2006 when Dutch researchers did some clever work to elucidate the effect.

What is Shear-Thining?

In reality, most fluids are non-Newtonian, which means that their viscosity is dependent on shear rate (Shear Thinning or Thickening). In contrast to Newtonian fluids, non-Newtonian fluids display either a non-linear relation between shear stress and shear rate.

Viscosity of Newtonian, Shear Thinning and Shear Tickening Fluids

Fluids are shear thinning if the viscosity decreases as the shear rate increases. Shear thinning fluids, also known as pseudo-plastic, are ubiquitous in industrial and biological processes. Common examples include ketchup, paints, and shampoo.

Explanation

Most of the time, the shampoo just forms a heap on the bottom of the surface, something like this:

kaye01

Occasionally, however, a dimple forms at the top of the pile. This is due to the fact that the jet of the falling shampoo has some momentum and exerts a force on the heap. Then a thin layer of shear-thinned fluid forms in the dimple, making a slippery barrier between the heap and the descending stream, preventing their merging. The stream gets a ramp-like structure to get deflected and launches from the dimple like a ski jumper: This in accordance with conservation of momentum as extra in coming shampoo is ejected out.

kaye02

Why there is a time lapse between the jets?

Once the stream of extra incoming shampoo is ejected the dimple begins to fill up again. They form a heap and the cycle continues. Therefore there is a time lapse between the outgoing jets of the shampoo.

Video Courtesy – ” Steve Mould

Besides this, you can view our video and blog collections in the Video Section & Blog Section of the website.

Abhijeet is a 4th-year Undergraduate Student at IIT Kharagpur. His major inclination is towards exploring the science behind the things of our day-to-day life.

Abhijeet Mahatohttp://scilynk.in
Abhijeet is a 4th-year Undergraduate Student at IIT Kharagpur. His major inclination is towards exploring the science behind the things of our day-to-day life.

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Most Popular

Nobel Memorial Prize in Economic Sciences 2022 | US Trio Bags the Award

Three economists from the United States claim the prestigious award in Economics this year. Ben Bernanke, Douglas Diamond and Philip Dybvig share...

Nobel Prize In Chemistry 2022 | Sharpless For The Second Time

Carolyn R. Bertozzi, Morten Meldal and K. Barry Sharpless become the 2022 Chemistry Nobel Laureates. They equally share the Nobel Prize in...

Nobel Prize Winner Svante Paabo | Nobel Prize In Physiology or Medicine 2022

A phalanx (finger bone) excavated from the dig sites of Denisova caves in Siberia was found to have the potential to tell...

Nobel Prize In Physics 2022 | Alain Aspect, John Clauser And Anton Zeilinger Win Physics Nobel

This time in 2022 it is Alain Aspect, John Clauser and Anton Zeilinger to be honored with the all prestigious Nobel Prize...

Recent Comments

Vishal P Singh on Pervading Darkness
Sanjeeb kumar sahoo on What is the Quality of your Soap?
Chandrashekar iyer on No Protons Just Neutrons
Chandrashekar Iyer on Pervading Darkness
Vivek Prakash on The Genomic Dust