The document discusses several factors that affect the viscosity of liquids. Viscosity refers to the stickiness or resistance to flow of a liquid. Key factors include flow conditions like laminar versus turbulent flow, shear rate, temperature, and pressure. Laminar flow results in lower viscosity than turbulent flow. Temperature and viscosity are inversely related, with higher temperatures resulting in lower viscosity. Pressure also affects viscosity, though not as significantly as temperature. The type of liquid, whether it is Newtonian or non-Newtonian, impacts how its viscosity responds to changes in factors like shear rate.

1. Factors Affecting Viscosity
of a Liquid
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2. Introduction
 It is the measure of stickiness of a fluid.
 Refers to molecular friction caused by
pushing of molecules past one another.
 Water always has a low viscosity.
 Other liquids such as shampoo or syrup have
high viscosity.
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3. Factors Affecting Viscosity
of a Liquid
 Several factors affect viscosity of a liquid.
 Flow conditions are among the factors .
 The two main flow conditions of a liquid are
laminar and turbulent.
 Laminar flow is when the liquid moves in the
thin imaginary layers.
 Happens without changing of molecules
from one layer to the other.
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4.  This flow is usually orderly.
 Turbulent flow does not have a recognizable
structure.
 Layers cannot be observed.
 Fluid develops cortices.
 When tested under this flow condition, liquid
depicts higher viscosity.
 Shear rate is another factor that influences
liquid viscosity.
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5.  Liquids that have internal flow that does not
depend on external forces
 That is the shear rate that act on the fluid.
 They are ideally viscous.
 Such fluids are called Newtonian fluids.
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6. Newtonian liquids
 They are ideally not viscous.
 Viscosity of the non-Newtonian liquids
changes with shear rate.
 Apparent viscosity of such liquids is specified.
 Some of them show shear-thinning behavior.
 Their viscosity decrease with increasing shear
rate.
 Others have viscosity that increases with an
increase in shear rate.
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7. Temperature Factor
 Temperature has dominating influence in
liquids viscosity.
 Most have low viscosity when temperatures
are high.
 Decreased temperature causes increased
liquid viscosity.
 Viscosity and temperature have an inversely
relationship in liquids.
 Temperature changes affects the viscosity of
a liquid.
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8. Pressure
 Pressure also affects viscosity of most liquids.
 Compressing liquids at medium or low pressures
is almost impossible.
 This makes pressure not a intense factor to
viscosity of liquids.
 Changing pressure from about 0.1 to 30MPa can
cause a similar viscosity change.
 This is with a change in temperature of
approximately 1 degree centigrade.

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AffectingViscosity of a Liquid
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