Specific weight is dependent on acceleration due to gravity as it changes from place to place. ρ {\displaystyle \tau =\mu {\frac {\partial u}{\partial y}}} It is the reciprocal of density. = Dimensionless parameters are used to simplify analysis, and describe the physical situation without referring to units. ρ The specific volume of a fluid is its volume per unit mass, and is the reciprocal of the mass density. ρ For gases we take air or O2 as a standard fluid with density, ρ=1.293 kg/m3. Kelvin is the most common one that is used because of its independence from the properties of the substance. Another unit used is standard cubic centimetres per minute (SCCM). (rho) is defined as the mass of the fluid over an infinitesimal volume. In addition to the properties like mass, velocity, and pressure usually considered in physical problems, the following are the basic properties of a fluid. b. Mathematically, it can also be denoted by w = ρg. 20. The pressure of a fluid is the force applied by it per unit area. Ans: Specific volume is the reciprocal of density. (gamma), and is generally defined as the weight per unit volume. e 055 ) {\displaystyle \rho } 1.8 Gases, hydrogen or air is choosen. They arose from dimensional analysis techniques. {\displaystyle Re={\frac {\rho ud}{\mu }}}. The viscous force is due to the intermolecular forces acting in the fluid. Application of dynamic forces (and the Reynolds number) to the real world: sky-diving, where friction forces equal the falling body's weight. It is defined as the weight possesses per unit volume. Q8: Arrange the following terms in the ascending order of their density. {\displaystyle \nu } = = The unit used is m3/kg. Stay tuned with BYJU’S for more such interesting articles. V Density is expressed in the British Gravitational (BG) system as slugs/ft3, and in the SI system kg/m3. By definition, anything that can flow is a fluid. The density of a fluid, is generally designated by the Greek symbol L The relationship between the shear stress and the velocity field was studied by Isaac Newton and he proposed that the shear stresses are directly proportional to the velocity gradient or we can say shear strain rate. Also, register to “BYJU’S – The Learning App” for loads of interactive, engaging Physics related videos and an unlimited academic assist. Temperature is measured in either Kelvin or Celsius or Fahrenheit. where ρ(rho) is the density, μ(mu) is the absolute viscosity, V is the characteristic velocity of the flow, and L is the characteristic length for the flow.

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