A fluid is a material that flows or is continuously deformed under shear (tangential stress). In other words, the fluid has zero shear modulus. A fluid is a biological material that flows across the surface. <\/p>\n\n\n\n
Liquids, Gases and Plasma Fluids. However, some solids also behave as liquids. For example, the pitch is a (very) slow-flowing high, viscosity solid. Silly putty flows but freezes with sudden force. Solids are not generally liquids because they resist tangential stress and deform only until they reach static equilibrium.<\/p>\n\n\n\n
In biology, fluid means the physics definition but also refers to body fluids such as blood, plasma, and urine. In this context, fluids such as saline solution and juice are also given to replace body fluids.<\/p>\n\n\n\n
Liquids can be classified as:<\/p>\n\n\n\n
Ideal fluid <\/strong>is <\/strong>a fluid that is in-compressible, & has no viscosity is called an ideal fluid. An ideal fluid is just an imaginary fluid because all fluids have some viscosity.<\/p>\n\n\n\n A fluid with viscosity is called a genuine fluid. All liquids are, in practice, actual liquids. Example: water, air etc.<\/p>\n\n\n\n A Newtonian fluid is called an accurate fluid in which the shear strain or velocity gradient is directly proportional.<\/p>\n\n\n\n Example: Benzine, Water etc.<\/p>\n\n\n\n A real fluid whose shear strain or velocity gradient is not directly proportional to the rate is called a non-Newtonian fluid.<\/p>\n\n\n\n Example: Plaster, slurries, pastes etc.<\/p>\n\n\n\n An ideal plastic fluid is a fluid whose shear stress is greater than the yield value and where the stress is directly proportional to the strain rate or velocity gradient.<\/p>\n\n\n\n A fluid whose density does not change under external force or pressure is called an incompressible fluid. All liquids are considered in this category.<\/p>\n\n\n\n A fluid whose density changes when an external force or pressure changes is called a compressible fluid. All gases are considered in this category.<\/p>\n\n\n\n Fluid Physics:<\/u><\/strong><\/p>\n\n\n\n \u00b7 They may be divided into three parts:<\/p>\n\n\n\nfluid dynamics equations<\/h2>\n\n\n\n
Tabular representation of fluid types:<\/h3>\n\n\n\n
Types of fluid<\/strong><\/td> Density<\/strong><\/td> Viscosity<\/strong><\/td><\/tr> Ideal fluid<\/td> Constant<\/td> Zero<\/td><\/tr> Real fluid<\/td> Variable<\/td> Non zero<\/td><\/tr> Newtonian fluid<\/td> Constant\/ Variable<\/td> T = u(du\/dy)<\/td><\/tr> Non-Newtonian fluid<\/td> Constant\/ Variable<\/td> T \u2260
u(du\/dy)<\/td><\/tr>Incompressible fluid<\/td> Constant<\/td> Non-zero\/zero<\/td><\/tr> Compressible fluid<\/td> Variable<\/td> Non-zero\/zero<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n fluid dynamics vs fluid mechanics<\/h2>\n\n\n\n