INTERVIEW SHORT QUESTION ANSWERS ON FLOW MEASUREMENT Keywords: circulation- vorticity- Venturimeter- Orifice meter – rotameter- coefficient of discharge Define circulation. How is it different from vorticity? Circulation It is defined as line integral of the tangential velocity about a closed path (contour). Circulation is a scalar quantity which is a macroscopic measurement of rotation for […]
INTERVIEW SHORT QUESTION ANSWERS-Turbulent flow Keywords: turbulent flow, Vena Contracta, notch, critical Reynolds number- flow net Define a turbulent flow. A turbulent flow has variable velocity (at every point) both in magnitude and direction. A turbulent flow has variable pressure (at every point). A turbulent flow has variable flow direction (at every point). A turbulent flow […]
INTERVIEW SHORT QUESTION ANSWERS ON pressure drop Keywords: Pascal’s Law- Froude’s number – Darcy – Fanning equations State the assumptions used in the Bernoulli’s theorem. Assumptions used in the derivation of Bernoulli’s theorem are Fluid is ideal i.e. there are no losses of any kind in the flow of an ideal fluid. Flow is steady […]
Pressure Drop Keywords: Pressure Loss-Fanning equation- Darcy-Weisbach equation 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 […]
Vorticity and Rotation Before vorticity is discussed, it is important to establish in a case under consideration 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 Reimann Equations—-2 and STREAM FUNCTION VS VELOCITY POTENTIAL 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 […]
Stream Function, Velocity Potential and Cauchy Reimann STREAM FUNCTION AND VELOCITY POTENTIAL 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 some complexity of fluid dynamics in a easy manner. STREAM FUNCTION […]
Types of Fluid Flow and Hydro-power Turbines 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 […]
FLUID MECHANICS- 1 Fluid: is matter which has tendency to flow. Fluid is a common name for a liquid, vapor and a gas. Hence a liquid is a fluid. A vapor is a fluid. A gas is a fluid. Mechanics deals with the laws of forces and the laws of motion. Therefore it is […]