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| '''Viscosity''' is a property of ] describing its internal resitance to flow and may be thought | |||
| ] | |||
| of as fluid friction. If the viscosity of a fluid is constant (neglecting temperature and pressure effects) | |||
| it is said to be a 'newtonian' fluid. Non-newtonian fluids exhibit a variation of viscosity depending on | |||
| ] within the flow field, the history that a fluid 'particle' experiences on its flow | |||
| path, etc. If the viscosity of a fluid solely depends on the gradients within the flow field it is called | |||
| generalized newtonian or purely newtonian. ] is the field of science that deals with | |||
| viscosity. | |||
| ⚫ | Some viscosities of (newtonian) fluids are listed below (more to follow): | ||
| '''Viscosity''' is a property of ] describing their internal resistance to flow and may be thought of as a measure of fluid ]. ] is the field of ] that deals with viscosity; viscosity is measured with a ]. | |||
| air 0.00001 Pa.s | |||
| If the viscosity of a fluid is constant (neglecting ] and ] effects) it is said to be a ]. ]s exhibit a variation of viscosity depending on ] within the flow field, the history that a fluid 'particle' experiences on its flow path, etc. If the viscosity of a fluid depends solely on the gradients within the flow field it is called generalized Newtonian or purely Newtonian. | |||
| water 0.001 Pa.s | |||
| The viscosity of fluids is either given as absolute or '''dynamic viscosity''' η (]·] = ]]/]<sup>2</sup> = ]/]]) or as '''kinematic viscosity''' ν (]<sup>2</sup>/]). Both terms are related via the ] ρ to each other: <math>\eta = \nu \cdot \rho</math>. The old smaller ] ] for dynamic viscosity is '']'' after ] (]-]): 1 poise = 100 centipoise = 1 ]/]] = 0.1 Pa·s. The old unit for kinematic viscosity is '']'' (in ] called ''stoke'') after ] (]-]): 1 stokes = 1 ]<sup>2</sup>/] = 0.0001 ]<sup>2</sup>/]. | |||
| oil xxx Pa.s | |||
| ⚫ | Some |
||
| glass xxx Pa.s (even glass is a fluid though it is perceived as a solid. Due to its very high viscosity, glass flows very very slowly.) | |||
| ] (at 0 °]): | |||
| :] 8.4 × 10<sup>-6</sup> Pa·s | |||
| :] 17.4 × 10<sup>-6</sup> Pa·s | |||
| :] 21.2 × 10<sup>-6</sup> Pa·s | |||
| ] (at 20 °]): | |||
| :] 0.248 × 10<sup>-3</sup> Pa·s | |||
| :] 0.326 × 10<sup>-3</sup> Pa·s | |||
| :] 0.59 × 10<sup>-3</sup> Pa·s | |||
| :] 0.64 × 10<sup>-3</sup> Pa·s | |||
| :] 1.025 × 10<sup>-3</sup> Pa·s | |||
| :] 2.0 × 10<sup>-3</sup> Pa·s | |||
| :] 17.0 × 10<sup>-3</sup> Pa·s | |||
| :] 30 × 10<sup>-3</sup> Pa·s | |||
| :] 81 × 10<sup>-3</sup> Pa·s | |||
| :] 985 × 10<sup>-3</sup> Pa·s | |||
| :] 1485 × 10<sup>-3</sup> Pa·s | |||
| :] 10<sup>7</sup> Pa·s | |||
| Contrary to many assertions, glass is an ], not a liquid, and it does not flow, but still we can talk about its viscosity. See the article on ] for more details on this. | |||
| Many fluids such as ] have a wide range of viscosity. | |||
| ------------- | |||
| '''Viscosity''' is also an out-of-print image and animation editing utility published by ]. It can work with ], ], ], ], ] and its native VSC format. | |||
Revision as of 23:11, 23 May 2003
Viscosity is a property of fluids describing its internal resitance to flow and may be thought of as fluid friction. If the viscosity of a fluid is constant (neglecting temperature and pressure effects) it is said to be a 'newtonian' fluid. Non-newtonian fluids exhibit a variation of viscosity depending on gradients within the flow field, the history that a fluid 'particle' experiences on its flow path, etc. If the viscosity of a fluid solely depends on the gradients within the flow field it is called generalized newtonian or purely newtonian. Rheology is the field of science that deals with viscosity.
Some viscosities of (newtonian) fluids are listed below (more to follow):
air 0.00001 Pa.s
water 0.001 Pa.s
oil xxx Pa.s
glass xxx Pa.s (even glass is a fluid though it is perceived as a solid. Due to its very high viscosity, glass flows very very slowly.)