Types of fluids c
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This document defines and describes different types of fluid flows: - Steady flows have constant fluid properties over time, while unsteady flows have properties that change over time. Laminar flows move in straight, parallel lines while turbulent flows move chaotically. - Uniform flows have constant velocity regardless of position, while non-uniform flows have varying velocity. - Compressible flows have changing density, while incompressible flows have constant density.
Types of fluids c
- 1. •S T E A D Y / U N S T E A D Y F L O W •U N I F O R M / N O N - U N I F O R M F L O W •L A M I N A R / T U R B U L E N T F L O W •D I M E N S I O N A L F L O W S •C O M P R E S S I B L E / I N C O M P R E S S I B L E F L O W •T A B U L A R P R E S E N T A T I O N Type of Fluid Flows
- 2. Steady/Unsteady Flow Steady Flow – The steady flow is a type of flow in which the fluid characteristics like velocity, pressure, density etc at a particular point doesn’t changes with time. (Example – P1 (Constant)(Location1) = P2(Constant)(Location2) Unsteady Flow - Where as unsteady flow is defined as a type of flow in which fluid characteristics changes with respect to time as particular point of time. (Example – P1(Variable)(Location1), P2(Constant)(Location2)) Quasi-Steady Flow – It is a type of flow in which fluid characteristics doesn’t changes at particular point with respect to time but characteristics changes at different location. (Example – P1(Constant)(Location1), P2(Constant)(Location2)) Fig1
- 3. Uniform/Non-Uniform Flow Uniform Flow – It is defined as a type of flow in which, at given time velocity doesn’t changes with respect to space (i.e length of direction of the flow). Non-Uniform Flow – Where as, non-uniform flow is a type of flow in which, at given time velocity changes with respect to space. Fig2
- 4. Laminar/Turbulent Flow Laminar Flow – It is a type of flow in which fluid particles move along in a well defined path or streamline and all streamlines are straight and parallel. Turbulent Flow – It is a type of flow in which fluid particles move in a zigzag way, due to which eddies formation take place which is responsible for high energy losses. Note – For pipe flow, type of flow is determined by non-dimensional number Reynolds Number. If Reynolds Number is less than 2000, the flow is called Laminar Flow and if Reynolds Number is greater than 4000, the flow is called Turbulent Flow. If number is between 2000-4000 flow can be treated as either Laminar or Turbulent. Fig3
- 5. Dimensional Flows One Dimensional Flow – It is type of flow in which velocity is a function of time and flow is in one space co-ordinate. Example (x) Two Dimensional Flow – It is similar to one dimensional flow but flow is in rectangular space coordinate and velocity is a function of time. Example (x,y) U = f(x), v=0 and w =0 Where, u, v & w are velocity component is x, y directions representatives. Fig4 – Example of One Dimensional Flow Fig5 – Example of Two Dimensional Flow
- 6. Compressible/Incompressible Flow Compressible Flow – Compressible flow is a type of flow in which density of fluids changes from a point to point. Incompressible Flow – Where as, in compressible flow is a type of flow in which density of fluid doesn’t changes from a point to point. Generally gases are compressible fluid flow and liquids are incompressible fluid flow. Fig6
- 7. Tabular presentation of Fluids Types of fluids Density Viscosity Ideal Fluids Constant Zero Real Fluids Variable Non Zero Newtonian Fluids Constant/Variable T = u(du/dy) Non Newtonian Fluids Constant/Variable T ≠ u(du/dy) Incompressible Fluids Constant Non Zero/Zero Compressible Fluids Variable Non Zero/Zero
- 8. Sources Fig1https://blog.softinway.com/unsteady-flow-simulation-in-hydraulic-systems/ Fig2http://stream1.cmatc.cn/pub/comet/HydrologyFlooding/streamflow/comet/hydro/basic/Routing/print_version/ 03-streamflow_characteristics.htm Fig3https://www.physiologyweb.com/figures/physiology_illustration_Gxr9bSdjRij69DSavoTbjWtiQ44Pw3aM_lamin ar_versus_turbulent_flow_in_blood_vessels.html Fig4http://www-mdp.eng.cam.ac.uk/web/library/enginfo/aerothermal_dvd_only/aero/fprops/cvanalysis/node7.html Fig5http://www-mdp.eng.cam.ac.uk/web/library/enginfo/aerothermal_dvd_only/aero/fprops/cvanalysis/node7.html Fig6https://www.chegg.com/homework-help/definitions/incompressible-and-compressible-flow-5