DRAG—FACTORS ON WHICH DRAG FORCE DEPENDS, TYPES OF DRAG, MAGNITUDE OF THE DRAG FORCE AND TERMINAL VELOCITY DRAG Drag is a force of resistance when a body is moving in water or air. In air, it is called aerodynamic drag. It is expressed in Newton’s. It is always against the thrust force. It opposes forward […]
DFLUID MECHANICS: Del operator, Gradient of a function, Laplace operator, Divergence and Differences between Bernoulli’s and energy equations Del operator ∇ = (∂/∂x, ∂/∂y, ∂/∂z) Gradient is partial derivative of a function with respect to x or y or z ∂p/∂x is pressure gradient in x direction ∂p/∂y is pressure gradient in y direction ∂p/∂z […]
FLUID MECHANICS: BERNOULLI EQUATION AND MOMENTUM EQUATION Bernoulli Equation The Bernoulli equation comes from Newton’s law of motion. Assumptions used in deriving Bernoulli’s equation: Flow is steady Incompressible flow Non-viscous flow (ideal fluid with zero viscosity) No losses and no energy exchanges Bernoulli’s equation states that “Total head of a flowing fluid is constant or […]
Compressible flow (Gas Dynamics) Compressible flow (gas dynamics) is that branch of fluid mechanics which deals with flow of fluids having significant changes in fluid density. Gases display such a behavior since liquids are incompressible. Mach number (the ratio of the speed of the fluid flow to the speed of sound) decides about the compressible […]
FLUID MECHANICS MECHANICAL ENGINEERING Practical Application of Dimensionless Numbers in making of Model of a prototype and representation of Dimensionless numbers in Tabular Form Dimensionless numbers are used in the development of a model of a prototype. A prototype means an actual object. A prototype can be a big object like an airplane, a dam and a […]
FLUID MECHANICS MECHANICAL ENGINEERING Dimensionless Numbers in Fluid Mechanics and Their Practical Utilities Every dimensionless number in fluid flow is the ratio of inertia force to some other force as described below. There are in all six forces. Accordingly, there are five dimensionless numbers in fluid mechanics. 1. Reynolds number It is a ratio of […]
Normal Shock, Fanno line and Rayleigh Line in a Compressible Flow NORMAL SHOCK IN A COMPRESSIBLE FLUID FLOW When the flow passes from a supersonic to subsonic in a SMALL distance, the velocity decreases suddenly and pressure rises sharply. This sudden pressure rise is a normal to the pipe surface and is called the NORMAL […]
*FLUID MECHANICS MECHANICAL ENGINEERING–Properties Of Fluids, Symbol, Definition, Dimension,Units, Predominant Forces in Fluid Mechanics and Temperature Measurement Criteria’s—- Change in volume, pressure, electrical resistivity, electrical potential, Optical properties and temperature measurement comparison chart TABLE: PROPERTIES OF FLUIDS, SYMBOL, DEFINITION, DIMENSION AND UNITS Sr. No PROPERTY Symbol Definition of Property Dimensions Units 1. Mass Density ρ […]