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What is resistance to flow?

What is resistance to flow?

Viscosity. The resistance to flow of a fluid and the resistance to the movement of an object through a fluid are usually stated in terms of the viscosity of the fluid. The constant of proportionality is called the viscosity.

When scientists measure a liquid’s resistance to flow they are measuring the liquids?


Question Answer
when scientist are measuring the liquids resistance to flow they are measuring the viscosity
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How does viscosity affect laminar flow?

(a) Laminar flow occurs in layers without mixing. Notice that viscosity causes drag between layers as well as with the fixed surface. (b) An obstruction in the vessel produces turbulence. Turbulent flow mixes the fluid.

What is the advantage of laminar flow?

Can be used to measure low flow rates. Ability to measure the flow of high viscous liquid. Linear relationship between flow rate and pressure drop.

What is the relation between viscosity and flow rate?

The resistance to flow in turn is directly proportional to the viscosity η . Thus, the flow rate is inversely proportional to the viscosity.

How do you know if a flow is laminar?

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.

Is laminar or turbulent flow better?

Under turbulent flow conditions, the increase in heat transfer rate is more significant than that under laminar flow conditions. This is due to the increase in the Reynolds number of the flowing fluid in turbulent flow. The turbulent effects become a dominant factor over secondary flow at higher Reynolds number.

At what Reynolds number does flow become turbulent?

approximately 2300

What is L in Reynolds number?

The Reynolds number id denoted by Re. L = length or diameter of the fluid. Reynolds number formula is used to determine the velocity, diameter and viscosity of the fluid.

Does laminar flow have more energy than turbulent flow?

turbulent flow can characterize how fluid is moving, with a laminar flow being a more smooth, orderly flow, and a turbulent flow being rough and chaotic. Laminar flow has a constant velocity at any point within the fluid, imagine similar to a constant flow of traffic.

How can I increase my turbulence?

First, any obstruction or sharp corner, such as in a faucet, creates turbulence by imparting velocities perpendicular to the flow. Second, high speeds cause turbulence. The drag between adjacent layers of fluid and between the fluid and its surroundings can form swirls and eddies if the speed is great enough.

Why does Turbulent Flow reduce drag?

Pressure drag is more significant than skin friction drag on large bodies – like your fuselage and nacelles. And since a turbulent boundary layer has more energy to oppose an adverse pressure gradient, engineers often force the boundary layer to turn turbulent over fuselages to reduce overall drag.