How To Read A Moody Diagram

If the flow is transient 2300 re 4000 the flow varies between laminar and turbulent flow and the friction coefiicient is not possible to determine. The coefficient can be estimated with the diagram below.

Fanning Friction Factor Wikipedia

To determine the frictional factor find the relative roughness value for the pipe on the right.

How to read a moody diagram. On the moody chart the friction factor is shown on the left hand y axis the reynolds number is shown on the x axis and the relative roughness is shown on the right hand y axis. Si based moody diagram. Other things to be aware of.

You have to mark that point. How do you read moodys diagram. Compute the relative pipe roughness.

This reynolds number indicates the turbulent flow. Then you look up 0015 on the right hand scale follow that curve along until the intersection then use the y value on the left hand scale for that point. The scale is logarithmic the dotted lines are there to help you work out how the hell to plotread a logarithmic scale.

We use the moody chart often to estimate frictional factors. Say we are calculating a reynolds number having value of 4x104. Select a relative roughness 0003.

So lets get into the moody chart. As with many fluid mechanics problems the first order of business is to determine. Refer to the moody chart.

How to read a moody chart moody diagram procedure. In fluid mechanics the moody chart or moody diagram is a graph which relates the darcy weisbach friction factor f d reynolds number re and surface roughness for fully developed flow in a circular pipe. This value is the roughness of the pipe.

How to read a moody chart moody diagram how to use a moody chart moody diagram to determine friction factors in steady state pipe flow solve implicit equations inside your excel worksheet solve implicit equations inside your excel worksheet solve colebrook and other implicit equations in seconds say no to moody diagram m a kumar on. An introduction to the famous moody chart. To download the notes i use for these videos please click the following link.

Then locate the pipes reynolds number on the bottom. Follow the curve contours in the left. A moody chart is commonly used by engineers to calculate the darcy weisbach friction factor which is then in turn used to calculate headpressure loss due to friction in pipes.

If the reynolds number falls in the laminar or transition range refer to appropriate equations. The friction factor can usually be interpolated between the laminar value at re 2300 and the turbulent value at re 4000. Both the reynolds number.

The red line should be to the right of the next dotted line over i think. Lets imagine we calculate a reynolds number of 4x104 yes im rigging for simplicity. If however the flow is in the turbulent range we are ready to proceed with the moody chart.

We have to follow this line our reynolds number from before. It can be used to predict pressure drop or flow rate down such a pipe. Now follow the image.

How to read a moody diagram. How to read a moody chart.

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Fluid Mechanics