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

Illustrates about the term rectangular footings, Illustrates about the term...

Illustrates about the term rectangular footings? RECTANGULAR FOOTINGS: The design of rectangular footings is similar to that of the square footings. The major difference is

Concept of continuum - thermodynamics, Concept of continuum - thermodynamic...

Concept of continuum - thermodynamics: Sol: Even the simplification of matter into molecules, atoms, electrons, etc. is too complex a picture for many problems of thermodyna

Design safe areas for plant, Q. Design Safe Areas for plant? A Safe Are...

Q. Design Safe Areas for plant? A Safe Area in this manual is regarded as a space that is not ranked as being a designated hazardous area by the relevant Regional or Country st

Find out ratio of strain-energy, Find out ratio of strain-energy: A ci...

Find out ratio of strain-energy: A circular rod of diameter d and length l is fixed at one end and a torque T applied at the other. Now, if any close coiled helical spring is

Calculate the natural frequency of the system, (a) A mass of 1 kg is to be ...

(a) A mass of 1 kg is to be supported on a spring having a stiffness of 9800N/m. The damping coefficient is 5.9 N-sec/m. Calculate the natural frequency of the system. Determine al

Calculate the cycle and production rate , Calculate the Cycle and Productio...

Calculate the Cycle and Production Rate for Single-Machine Robotic Cell Determine the cycle and production rate for a single-machine robotic cell for an 8-hr shift if the syst

Determine the efficiency of bell coleman cycle, (a) Derive a mathematical e...

(a) Derive a mathematical expression to determine the efficiency of Bell Coleman Cycle. (b) A dense air refrigeration cycle acts between pressures of 4 bar and 16 bar. The air t

Formed heads of vessels, Q. Formed heads of vessels? Formed heads are g...

Q. Formed heads of vessels? Formed heads are generally of 2:1 semi ellipsoidal form, but other heads may be used, such as hemispherical, torispherical, conical and toriconical.

Advantages-disadvantages of transparent polymeric, (a) List several advanta...

(a) List several advantages and disadvantages of using transparent polymeric materials for eyeglass lenses. (b) Cite four properties (in addition to being transparent) that are

Write Your Message!

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