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In fact, B is not a constant, it hides one of the variables in pipe flow. The mass of one molecule of air may be computed as. This acceleration is negative, as expected, and reaches a minimum near point B, which is found by differentiating the acceleration with respect to x:.

Due to element weight, the pressure along the lower and right sides must vary linearly as shown, mecyanics a higher value at point C. Without peeking into another textbook, find the form of the Galileo number if it contains g in the numerator. If M is proportional to L, find its form.

White – 5th edition solution manual Frank M.

Then convert everything to consistent units, for example, BG:. For homogeneity, the right hand side must have dimensions of stress, that is.

Solution Manual – Fluid Mechanics 4th Edition – Frank M. White

Actually, the Hazen-Williams formula, still in common use in the watersupply industry, is valid only for water flow in smooth pipes larger than 2-in. Thus the final desired homogeneous relation for dam flow is:. The parameter B must have dimensions of inverse length.


Then the formula predict a mean free path of. What are the dimensions rfank B? Clearly the formula cannot be dimensionally homogeneous, because B and H do not contain the dimension time. White Ana row Enviado por: Is air rarefied at this condition? This equation, like all theoretical partial differential equations in mechanics, is dimensionally homogeneous. Can fluis equation be used with confidence for a variety of liquids and gases?

The correct dimensionally homogeneous beam bending formula is thus:. Convert stress into English units: This group has a customary name, which begins with C.

Solution Manual – Fluid Mechanics 4th Edition – Frank M. White | Benoit Dozois –

Is the formula homogeneous? Vertical forces are presumably in balance with element weight included.

The formula is dimensionally homogeneous and can be used with any system of units. The formula would be invalid for anything except English units ft, sec.

Is this formula dimensionally homogeneous?

Solution Manual – Fluid Mechanics 4th Edition – Frank M. White

What is the only possible dimensionally homogeneous relation for this flow rate? Now we have reduced the problem to:. The formula is therefore dimensionally homogeneous and should hold for any unit system. The formula admits to an arbitrary dimensionless constant C whose value can only be obtained from known data. Use these values to estimate the total mass and total number of molecules of air in the entire atmosphere of the earth. Write this formula in dimensional form, using Table But horizontal forces are out of balance, with the unbalanced force being to the left, due to the shaded excess-pressure triangle on the right side BC.


Using Tablewrite this equation in dimensional form:.

If kanual, try to explain the difficulty and how it might be converted to a more homogeneous form. By comparing with the answer to Prob. The relation is now. Substitute the given data into the proposed formula:.

Therefore the Stokes- Oseen formula derived in fact from a theory is dimensionally homogeneous.

From Table A-2, its viscosity is 1. Can you guess its name? Find the maximum height zmax reached by the ball and compare your results hwite the elementary-physics case of zero air drag.

The proper form of the pipe flow relation is. Test each term in sequence:. Using the concepts from Ex. Clearly, the formula is extremely inconsistent and cannot be used with confidence for any given fluid or condition or units. Arquivos Semelhantes solution manual Frank M.