Del operator-Laplacian operator-Divergence Keywords: 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 is pressure gradient in z direction ∂v/∂x, ∂v/∂y, and ∂v/∂z are velocity gradients. ∂V/∂x, […]
FLUID MECHANICS INTRODUCTION Fluid flow is a mass transfer process which helps to calculate the size of a pump and a pipeline for transferring fluids. Fluid flow effects rates of heat transfer, mass transfer and reaction rates . Fundamental laws governing the fluid flow are Conservation of Mass, Conservation of Energy and Conservation of Linear […]
FLUID MECHANICS Keywords:Fluid flow, conservation laws, Continuity, Bernoulli’s and Momentum Equation. INTRODUCTION Fluid flow is a mass transfer process which helps to calculate size of a pump and a pipeline for transferring fluids and effects of fluid flow on rates of heat transfer, mass transfer and on reaction rates . Fundamental laws governing the fluid flow […]
M C Q ON CAVITATION · 1. Cavitation is a process of (a) Liquid formation (b) Vapor formation (c) Neither vapor nor liquid formation (d) None ANS: (b) Cavitation is found in (a) An accelerated liquid flow (b) De-accelerated flow (c) Gas flow (d) None ANS: (a) […]
M C Q ON WATER HAMMER The other name of water hammer is (a) Shock wave (b) Fluid blow (c) Water blow (d) None ANS: ( c) Water hammer is due to (a) Sudden change in internal energy (b) Sudden change in potential energy (c) Sudden change in molecular energy (d) None ANS: (d) Water […]
DRAG Keywords: 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 motion. Drag force is present in a moving fluid. It is found in fluid […]
WATER HAMMER Water hammer is also called a fluid hammer or Hydraulic Shock’ or a water blow. It largely takes place in liquids but to a limited extent it can also be present in gases. It is a very high pressure wave created due to sudden change in momentum due to sudden stopping a moving […]
CAVITATION Keywords: It is process of vapor formation (creating a void in liquid flow) in an accelerated liquid flow at a certain temperature. The accelerated flow is found in pumps and turbines etc. Due to acceleration, there is an increase in velocity and hence fall of static pressure resulting in low pressure below the saturation […]
Bernoulli’s- energy-Momentum equations Keywords: 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 […]
CENTRIFUGAL COMPRESSOR, FLUID MECHANICS MECHANICAL ENGINEERING–INTERVIEW SHORT QUESTION ANSWERS–Centrifugal compressor–Slip factor, Input factor, surging, stalling and choking in an axial as well as in centrifugal compressors Explain slip factor and work input factor in a centrifugal compressor. Slip factor During the fluid flow through the impeller passage, there is a pressure difference and velocity difference […]