common fluids around us

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Fluids in Our Daily Life Submitted to: Sir Dr. Shahid Naveed Sahib Submitted by: Muhammad Usman (08-chem-02-B) Date: 14 September 2009 Department of Chemical Engineering

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classification of fluids based upon their properties

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Page 1: common Fluids around us

Fluids in Our Daily Life

Submitted to:

Sir Dr. Shahid Naveed Sahib

Submitted by:

Muhammad Usman (08-chem-02-B)

Date: 14 September 2009

Department of Chemical Engineering

University of Engineering and Technology, Lahore

Page 2: common Fluids around us

Fluid:A fluid is a substance that doesn’t permanently resist distortion.

Types of fluids:Fluids are classified with respect to their nature. A common classification of fluids is presented below…

On the basis of change in density1. Compressible fluids:2. Incompressible fluids

Incompressible fluids:These are the fluids whose density changes to a little extent with the moderate change in temperature and pressure. Liquids are considered as the common example of incompressible fluids.

Compressible fluids:These are the fluids whose density changes considerably with moderate change in temperature and pressure. Their common example is

1. Gases2. Air

However with the small changes in temperature and pressure gases are also considered as incompressible fluids.

On the basis of their viscosity:On the basis of viscosity liquids are classified into two types which are further subdivided.

1. Newtonian fluids2. Non Newtonian fluids

Newtonian fluids: Fluids that show their linear line behavior when a graph is plotted with velocity gradient at one axis and the shear stresses at the other. This straight line passes through the origin.

In general we can say that in their behavior they are somewhat similar to water.

Non Newtonian fluids:Fluids whose curves show deviations from a straight line when their behavior is plotted on the graph (between velocity gradient at one axis and shear stresses at the other axis) are called Non Newtonian fluids

They are further subdivided on the basis of their graphical curved shapes.

Page 3: common Fluids around us

1. Bingham plastic:Fluids that do not flow at all until a Threshold shear stress is reached are called Bingham fluids. After this threshold shear stress they follow the linear behavior like that of water.

In general they are the Newtonian fluids with the difference of this that their line does not pass through the origin.

Example:

Example of this is the “sewage sludge”.

2. Pseudo plastic fluids:Their curve passes through the origin, is concave downward at low shears and becomes nearly linear at high shears. They are also called shear rate thinning fluids.

These fluids are thicker than Newtonian fluids.

Example:

“Rubber latex” is an example of this type.

3. Dilatants:Their curve is concaving upward at low shears and almost linear at high shears. They are also called shear rate thickening fluids.

These are thinner fluids than Newtonian fluids.

Example:

“Quicksand” and “sand filled emulsions” are the common examples.

Fluids1 Water 11 Perfumes2 Mustard oil 12 Spirits3 Hydraulic oil 13 Thinner4 Engine oil 14 Shampoo5 Sugar water solution 15 Air6 Turpentine oil 16 Household gas7 Kerosene oil 17 Cold drink8 Petrol 18 Fruit juices9 Diesel 19 C N G Gas10 Mobile oil 20 Hydrochloric acid