INTERVIEW SHORT QUESTION ANSWERS ON FLOW MEASUREMENT Define circulation. How is it different from vorticity? Circulation Circulation is defined as line integral of the tangential velocity about a closed path (contour). It is a scalar quantity. Its symbol is ɼ. Vorticity It is the tendency of a fluid particle to rotate or spin at a particular point. Vorticity […]
INTERVIEW SHORT QUESTION ANSWERS-TURBULENT FLOW Define a turbulent flow. A turbulent flow has variable velocity (at every point) both in magnitude and direction. Pressure is also variable at every point. This flow is highly irregular. Fluid flow lines cross each other randomly. Velocity loss, pressure loss and energy loss is there in a turbulent flow. Flow […]
INTERVIEW SHORT QUESTION ANSWERS ON PRESSURE DROP 1. What is difference between Darcy and Fanning equations for the pressure drop in a fluid flow? Darcy friction factor is four times the Fanning friction factor. Darcy friction factor is also called as Moody friction factor or Blasius friction factor. laminar flow, Darcy friction factor = fD= […]
Pressure Drop-2 Pressure loss in fluid flow through pipes depends on (i) Pipe material and its roughness (ii) Shape and size of the pipe (iii) Shape and size of the pipe fitting (iv) Type of flow (laminar, turbulent and transition flow) which depends on Reynolds number Thus pressure drop depends on density, velocity viscosity of […]
Fluid Mechanics-4-Vorticity and Rotation Vorticity and Rotation Before vorticity is discussed, it is important to establish whether the flow exist or not. For flow to exist, equation of continuity must be satisfied. For an in-compressible fluid ∂u/∂x = 0 for 1- dimensional flow ∂u/∂x + ∂v/∂y = 0 for a 2- dimensional flow ∂u/∂x + […]
FLUID KINEMATICS—-EQUATIONS OF FLUID MOTION Fluid motion equation use two approaches. (i) Integral approach–Not being dealt here. (ii) Differential approach Differential approach uses Control Volume method A control volume is a finite region having OPEN boundaries through which there is mass transfer, momentum transfer and energy transfer. Control volume method considers the followings aspects: a. […]
Stream Function, Velocity Potential and Cauchy Riemann Equations—-2 VELOCITY POTENTIAL Velocity Potential φ is a Scalar Function of space and time co-ordinates such that its NEGATIVE derivative with respect to any direction give the fluid velocity in that direction. Thus φ is a 3-D function. φ= f(x, y, z, t) For a steady flow φ= (x, […]
Stream Function, Velocity Potential and Cauchy Riemann Equations Stream function ‘ψ’ and velocity potential ‘φ’ are arbitrary fictitious parameters. These do not exist in actual practice. Fluid flow is a complex phenomenon. Thus these have been developed to understand complexity of fluid dynamics in a easy manner. STREAM FUNCTION It is the volume flux in the […]
Types of Fluid Flow-2 TABLE: Types of Fluid Flow Sr. No. Type of Flow Definition Application 1. One Dimensional Flow When two velocity components are negligible fully-developed flows in long uniform pipes and open-channels in which velocity is uniform across the pipe cross-section 2. 2-Dimensional When one velocity components is negligible flow past a […]
Types of Fluid Flow FLUIDS IN MOTION There are different types of flows for a moving fluid. The study of moving fluids is quite complex, tedious and time consuming. But the analysis can be made simple by making one or more simplifying assumptions e.g., one-dimensional flow, steady-state flow, non-viscous flow and in-compressible flow. More is […]