Application of equation of continuity

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Continuity equation derivation in fluid mechanics with applications

Answer Wiki. Answered Sep 6, Thanks for A2A. Hope you like the answer.

What is the continuity equation? What is the general continuity equation? Why is the equation of continuity called the equation of continuity?

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What is a continuity equation? What are the biggest tracker networks and what can I do about them? Having stipulated that the segment is filled with fluid, the incoming fluid has no room to expand in the segment. Having stipulated that the fluid is incompressible, the molecules making up the fluid cannot be packed closer together; that is, the density of the fluid cannot change.

With these stipulations, the total mass of the fluid in the segment of pipe cannot change, so, any time a certain mass of the fluid flows in one end of the segment, the same mass of the fluid must flow out the other end. This can only be the case if the mass flow rate, the number of kilograms-per-second passing a given position in the pipe, is the same at both ends of the pipe segment.

An interesting consequence of the continuity principle is the fact that, in order for the mass flow rate the number of kilograms per second passing a given position in the pipe to be the same in a fat part of the pipe as it is in a skinny part of the pipe, the velocity of the fluid i.

In both cases, in order for the entire slug of fluid to cross the relevant position line, the slug must travel a distance equal to its length. So, if the slug at position 2 is longer and it has to travel past the position line in the same amount of time as it takes for the slug at position 1 to travel past its position line, the fluid velocity at position 2 must be greater.

The fluid velocity is greater at a skinnier position in the pipe.

Continuity Equation, Volume Flow Rate & Mass Flow Rate Physics Problems

The volume flow rate is typically referred to simply as the flow rate. Now back to our goal of finding a mathematical relation between the velocities of the fluid at the two positions in the pipe.


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Each volume can be replaced with the area of the face of the corresponding slug times the length of that slug. The same is true for slug 2 and position 2. This is the relation, between the velocities, that we have been looking for.

Use of the continuity equation for electromagnetic energy flow to describe radiation transport

It applies to any pair of positions in a pipe completely filled with an incompressible fluid. It can be written as.

Continuity Equation

Further note that if we multiply the flow rate by the density of the fluid, we get the mass flow rate. Consider a pipe full of a fluid that is flowing through the pipe.

Presentation on theme: "Equations of Continuity"— Presentation transcript:

In the most general case, the cross-sectional area of the pipe is not the same at all positions along the pipe and different parts of the pipe are at different elevations relative to an arbitrary, but fixed, reference level. Pick any two positions along the pipe, e. The final topic is similitude and dimensional analysis. This includes concepts of fundamental dimensions and dimensional homogeneity, the Buckingham Pi theorem of dimensional analysis, and the conditions for complete similitude between a full-scale prototype flow situation and a small scale model.

In all cases, basic ideas and equations are presented along with sample problems that illustrate the major ideas and provide practice on expected exam questions.

Continuity equation derivation in fluid mechanics with applications

Time: Approximately 6 hours Difficulty Level: Medium. Fundamentals of Engineering Exam Review. Enroll for Free. From the lesson. Fluid Properties- Introduction Fluid Properties-Density and Pressure Fluid Properties-Stresses Viscosity Fluid Properties-Surface tension Fluid Properties-Units and other properties Fluid Statics- Introduction and Pressure Variation Fluid Statics-Application to manometers and barometers Fluid Statics-Forces on submerged plane surfaces