By James R. Welty, etc.

Basics of Momentum, warmth, and Mass move, now in its 5th version, maintains to supply a unified therapy of momentum move (fluid mechanics), warmth move, and mass move. This re-creation has been up to date to incorporate extra assurance of contemporary themes equivalent to biomedical/biological functions in addition to an extra separations subject on membranes. also, the 5th version will specialize in an specific problem-solving technique that's completely and constantly carried out during the text.

Designed for undergraduates taking shipping phenomena or move and expense method classes.

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Additional info for Fundamentals of Momentum, Heat, and Mass Transfer: Solutions Manual

Example text

In addition, sediment concentration is sometimes given by weight or mass per unit volume of the mixture (N · m−3 or kg · m−3 ), which is obtained by γs c or ρs c. It is also given in parts per million by weight (ppm), which is equivalent to 106 c. Note that the volumetric sediment concentration c is used in this book, except where stated otherwise. 4 Sketch of the water and sediment mixture. 23) and the specific weight of the mixture is correspondingly given by γ = ρg. 24) where uf i is the i-component of water velocity, usi is the i-component of sediment velocity, and i denotes three spatial directions (= 1, 2, 3).

Some wash load in upstream channels may become bed-material load in downstream channels due to the weakening of flow strength. Some sediment particles are wash load in the main channel but may be bed-material load in flood plains. By definition, the bed-material load is the sum of bed load and suspended load. So is the wash load. However, the wash load consists of fine particles that move mainly in suspension, and thus dividing it into bed load and suspended load does not make much sense in practice.

95) where Ux and Uz are the width-averaged velocities in the x- and z-directions, defined by Eq. 93). 97) where p˜ and Tij (i, j = x, z) are the width-averaged pressure and stresses, respectively; Dij are the dispersion momentum transports due to the lateral non-uniformity of flow velocity, defined as Dxx = − ρb b2 b1 (ux − Ux )2 dy, Dxz = Dzx = − ρb b2 b1 (ux − Ux )(uz − Uz )dy, and Dzz = − ρb b12 (uz − Uz )2 dy; τxl and τzl (l = 1, 2) are the shear stresses in the x- and z-directions on the two bank surfaces; and ml are the bank slope coefficients, defined as ml = [1 + (∂bl /∂x)2 + (∂bl /∂z)2 ]1/2 .

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