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THE FIRST MENU

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VISCOSITYREFERENC

EEXAMPL

EMY BIO

Physic education 2014……viscosity of fluid… :Lina wahyuni……… :@lina16wahyuni

THE FIRST MENU

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VISCOSITYREFERENC

EEXAMPL

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UNDERSTANDING

LAMINAR & TURBULEN

NUMBER OF REYNOLD’S

MY BIO


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UNDERSTANDING of VISCOSITY


VISCOSITYViscosity is a measure of the viscosity of the fluid that states the size of the friction in the fluid.International unit for viscosity coefficient is Ns / m2 or pascal second (Pa s).The greater the viscosity of a fluid, the more difficult a fluid flow and the harder an object moving in the fluid.In the liquid, the viscosity generated by the cohesive forces between the molecules of the liquid.While in the gas, the viscosity arising as a result of collisions between gas molecules.

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The coefficient of viscosity is generally measured by two methods, namely:Ostwald viscosityThe time required to drain a certain amount of fluid is recorded and calculated using the relationship:Because P = ρgh then the above equation can be written as follows.where:P = hydrostatic pressureR = radius of capillary / tubeT = time as much as the volume of fluid flow (V) with a height difference (h)l = length of capillary / tube

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Generally the viscosity coefficient calculated by membendingkan flow rate of fluid viscosity coefficient is known.The relationship is:Where d. t = flow rateFalling ball methodFalling ball method involves the force of gravity is balanced by the movement concentrated flow and relationship areWhere:b = ball fell or beadsg = gravitational constant

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Factors that affect the viscosity is as follows (Bird, 1987):The viscosity of the fluid pressure rises with increasing pressure, while the viscosity of the gas is not affected by pressure.Viscosity temperature will go down as the temperature increases, while the gas viscosity rises as the temperature increases. Heating the liquid causes the molecules gain energy. Fructose molecules move so that the interaction force between molecules weakened. Thus the viscosity of the fluid will go down with increasing temperature.Viscosity molecular weight will go up if bond more

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The presence of other substances Addition of sugar cane to increase the viscosity of water. The existence of additional ingredients such as suspension materials raise the viscosity of water. On oil or glycerin to the addition of water will cause the viscosity will drop as glycerin and oil will be more dilute, alirnya times faster.Size and molecular weight viscosity rises with increasing molecular weight. Eg alcohol faster flow rate, solution flow rate of oil is slow and high viscosity seta slow flow rate so that the viscosity is too high.The viscosity of strength between molecules of water rising denghan presence of hydrogen bonding, the viscosity of CPO with OH groups on triglycerides rose in the same circumstances

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Concentration of the solution viscosity is directly proportional to the concentration of the solution. A solution with a high concentration will have a high viscosity as well, because the concentration of the solution stated number of particles dissolved substances per unit volume. The more particles are dissolved, partikrl friction between the higher and the higher viscosity

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viscosity at different viscosity that occurs due to the collision of particles in it. The difference can be measured quantitatively.

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UNDERSTANDING of VISCOSITY

HOW TOKNOWVISCOSITYOF FLUID


ALIRAN LAMINER & ALIRAN TURBULEN

Laminar flow if the liquid is viscous and flow is not too fast

if the fluid velocity exceeds a certain price which happens to be a complex flow. in the rotation flow occurs is called vortex, and the flow gets bigger obstacles.

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REYNOLDS NUMBER

If the Reynolds number is obtained 0-2000 then be Laminar flowIf the Reynolds number is obtained> 3000 then the flow is turbulentIf the Reynolds number is obtained 2000 - 3000 there is a transition region, the flow can be changed from laminar into a turbulent state or contrary

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Physic education…viscosity of fluid :Lina wahyuni, :@lina16wahyuni

EXAMPLEA marble has a density of 0.9 g / cm3 which radius of 1.5 cm was dropped freely in a tube containing the oil that has a density of 0.8 g / cm3 and viscosity coefficient of 0.03 Pa s. Determine the terminal velocity of the marbles?knowed :ρkelereng = 0,9 g/cm3 = 900 kg/m3

r = 1,5 cm = 1,5 x10-2 mρoli = 0,8 g/cm3 = 800 kg/m3

η = 0,03 Pa s.g = 10 m/s2

Asked : specify the terminal velocity (v) the ball?

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EXAMPLE

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REFERENCES

Sutrisno.1984.Fisika Dasar.ITB : Bandung

Anonim.2012.Aliran Laminer dan Turbulence. https://maglevworld.wordpress.com/2012/05/09/aliran-laminar-dan-turbulence/https://hedihastriawan.wordpress.com/kimia-fisika/viskositas/http://www.academia.edu/6427305/Viskositas

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https://maglevworld.wordpress.com/2012/05/09/aliran-laminar-dan-turbulence/



https://hedihastriawan.wordpress.com/kimia-fisika/viskositas/



MY BIONama : Lina WahyuniProdi : Pendidikan FisikaUniversitas : JambiAlamat blog : http://linawahyuniunja.blogspot.com/Facebook : Lina wahyuniTwitter : @Lina16wahyuniIg : @Lina wahyounie

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