What do you mean by rigid bed models, Mechanical Engineering

Assignment Help:

Q. What do you mean by Rigid bed models?

Models with rigid boundary and geometrically similar form are used in studies connected with outlet works, stilling basins, spillways etc. Conditions of Froude Number equality, equality of horizontal and vertical scales and adoption of some flow formula enable working out of the scales of the model. The scale of boundary friction in this case works out to be such that model is required to be made smoother than the prototype.

Rigid boundary models are often constructed for determination of flood levels in rivers and flood routing studies. If geometrically similar model is constructed, depth, velocity and Reynolds Number in the model becomes too small whereas discharge required becomes too big. These difficulties can be surmounted if depths are exaggerated in the model. Such models are, therefore, termed vertically exaggerated models. Since long lengths of rivers are normally required to be reproduced in such models, availability of space usually puts constraint on horizontal scaling. Vertical exaggeration results in model roughness being required more than in the prototype which is often achieved by embedding artificial roughness elements. This puts another constraint on scaling. Exaggeration of depths in relation to horizontal dimensions is generally high in such models.


Related Discussions:- What do you mean by rigid bed models

Importance of angle of twist, Importance of angle of twist: Q: What i...

Importance of angle of twist: Q: What is the importance of angle of twist? From relation T / J = G. θ / L ;  we have               θ= T . L / G . J As G , L , J

Friction is desirable, Friction is Desirable: A friction is much de...

Friction is Desirable: A friction is much desirable to stop the body from its moving condition. If there is no friction between contact surfaces, then the body cannot be st

Working of gasifier combined cycle power plant, With the help of a neat dia...

With the help of a neat diagram illustrate the working of Gasifier combined cycle power plant. Describe with the help of neat diagram the working of Pressurised water reactor nu

Design the pavement, As spring approaches, your design rm has been tasked ...

As spring approaches, your design rm has been tasked with designing a two-lane highway in rural Wyoming. The highway descends a hill, crosses a river, and must shift to a parallel

Factor for selecting a digital encoder, What factors should be considered w...

What factors should be considered when selecting a digital encoder (line codes)? Briefly mention five of those factors. Use sketches and additional text to describe the following e

Why we use cold working, Q. Why we use cold working? Cold working takes...

Q. Why we use cold working? Cold working takes place below the recrystallization temperature, and therefore is fundamentally different at the atomic level with effects up to th

Determine the equivalent evaporation, Illustrate how the efficiency of Rank...

Illustrate how the efficiency of Rankine Cycle can be improved by the use of Regenerative and Reheat heating. (b) During a test on boiler trial the following data were obtained

Handling suspect material, Q. Handling Suspect Material? • Material or ...

Q. Handling Suspect Material? • Material or items at a Supplier's facility or those received or stored in the warehouse or other construction site location that require PMI-tes

What are the principles of location of drilling jig, a) Define the degree o...

a) Define the degree of freedom of a work piece in space. What are the basic principles of location of drilling jig.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd