By Ronald Darby
Combining theoretical and empirical views right into a sincerely prepared and finished textual content, Chemical Engineering Fluid Mechanics, moment version discusses the critical behavioral options of fluids and the fundamental equipment of study for fixing quite a few engineering occasions. Drawing at the author's 35 years of expertise, the e-book covers the issues and issues of functionality, apparatus operation, and sizing and choice from the point of view of a strategy engineer-with real-world engineering difficulties. It provides over four hundred end-of-chapter difficulties and examples to enhance crucial innovations and comprises over 1100 equations, literature references, illustrations, and tables.
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See Table 6-1). , plastic), then the required lab diameter is set by Eq. (2-11): Dm ¼ Df "m "f 0:00006 ¼ ð48 in:Þ 0:0018 ¼ 1:6 in: Since the roughness values are only approximate, so is this value of Dm . 6 in. (for example, from Appendix F, we see that a Schedule 40, 112 in. , which is fortuitous). We now have ﬁve remaining unknowns—Qm , m , m , Lm and ðÁPÞf — and only two remaining equations, so we still have three ‘‘arbitrary’’ choices. Of course, we will choose a pipe length for the model that is much less than the 700 miles in the ﬁeld, but it only has to be much longer than its diameter to avoid end eﬀects.
For example, the exponent 2 in the last term of Eq. (2-6) has no dimensions and hence has the same magnitude regardless of the scale or units used for measurement. Likewise, the kinetic energy per unit mass of a body moving with a velocity v is given by ke ¼ 12 v2 Both of the numerical quantities in this equation, 1/2 and 2, are dimensionless, so they always have the same magnitude regardless of the units used to measure v. A. ’’ However, many valuable engineering relations have an empirical rather than a theoretical basis, in which case this conclusion does not always hold.
11. When the energy balance on the ﬂuid in a stream tube is written in the following form, it is known as Bernoulli’s equation: P2 À P1 þ gðz2 À z1 Þ þ ðV22 À V12 Þ þ ef þ w ¼ 0 2 where Àw is the work done on a unit mass of ﬂuid, ef is the energy dissipated by friction in the ﬂuid per unit mass, including all thermal energy eﬀects due to heat transfer or internal generation, and is equal to either 1 or 2 for turbulent or laminar ﬂow, respectively. , calories) Conversion Factors, Precision 12.