How do you know if a flow is laminar or turbulent?
For practical purposes, if the Reynolds number is less than 2000, the flow is laminar. If it is greater than 3500, the flow is turbulent. Flows with Reynolds numbers between 2000 and 3500 are sometimes referred to as transitional flows.
What is wide rectangular channel?
A wide rectangular channel carries discharge of 6 m3/s per meter width. The channel has a bed slope of 0.009 and Manning’s roughness coefficient, n = 0.015. At a certainsection of the channel, the flow depth is 1.5m.
In which of the following situations the flow is considered steady?
It can be a steady flow if and only if the water level is maintained at a constant level by supplying water at the same rate as it gets discharged, else the water level will keep decreasing with time leading to an unsteady flow.
What is the static head corresponding to a flow velocity of 10 ft SEC?
Air Flow – Velocity Heads
| Air Flow Velocity – v – (ft/sec) | Velocity Head – hw – (ft H2O) |
|---|---|
| 5 | 0.00047 |
| 10 | 0.0019 |
| 15 | 0.0042 |
| 20 | 0.0075 |
What is the formula for pressure head?
So, for any particular measurement of pressure head, the height of a column of water will be about [133/9.8 = 13.6] 13.6 times taller than a column of mercury would be. So if a water column meter reads “13.6 cm H2O”, then an equivalent measurement is “1.00 cm Hg”.
What is meant by piezometric head?
Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum. It is usually measured as a liquid surface elevation, expressed in units of length, at the entrance (or bottom) of a piezometer.
Is pressure related to flow rate?
Higher pressure differences will drive greater flow rates. The pressure gradient establishes the direction of flow. Flow is different than velocity.
What is the difference between flow rate and fluid velocity?
Flow is a measure of air output in terms of volume per unit of time. Velocity refers to how fast the air is moving in distance per unit of time. The common units are feet per second, metres per second, etc. ​Pressure is the measure of force applied on an area.
What is the relationship between pressure and velocity?
Pressure and velocity are inversely proportional to each other. If pressure increases, the velocity decreases to keep the algebraic sum of potential energy, kinetic energy, and pressure constant.
Do all fluids have the same flow rate?
Yes they are the same thing. Volume flow rate is the same as “Flux” and “R”. There are two different equations used to express volume flow rate, it can be expressed as Volume/Time. Another equation to express volume flow rate is, Cross sectional Area(Distance/Time) or Cross sectional Area(Velocity).
What are the four factors that affect flow rate?
Factors that affect fluid flow
- The viscosity, density, and velocity of the fluid.
- Changes in the fluid temperature will change the viscosity & density of the fluid.
- The length, inner diameter, and in the case of turbulent flow, the internal roughness of the pipe.