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By Samuel Seely

ISBN-10: 0080168213

ISBN-13: 9780080168210

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1-47 that the sources that are included in the model depend on certain input and output variables, and are known, therefore, as dependent sources. This matter will be discussed in greater detail in Chapter 10. A study of electronic circuits is a specialized one that involves special configuration of driver and network elements. oVo Fig. 1-47. An equivalent active network for Eq. (1 -57). ) is particularly important since the operation of an electronic circuit is not necessarily in the linear mode.

1-56) Note that laminar resistance is constant, and is directly analogous to electrical resistance. However, laminar flow is not often encountered in industrial practice. 6), A = area of restriction, m2, g = acceleration due to gravity, m/sec2, h = head of liquid, m. Unlike Eq. (1-55) for laminar flow, this expression shows a square law flow relation between Q and h. The turbulent resistance is given by the relation, R= dh dQ Q gfPA2 2{hx-h2) (sec/m2) Q (1-58) if the flow coefficient K is considered constant.

Convection 77777777777 c. Storage Fig. 1-44. Thermal processes. A fluid or gas is involved in convection heat transfer, and convection is the process by which heat transfers across a heated surface into (or from) the fluid {see Fig. l-44b). For convection heat transfer, by the Newton law of cooling, Q = hA{d1 — 62) (Joules/sec) (1-73) where h is the convection coefficient (Joules/m 2 -sec-deg). It is expected that h will depend on the fluid and upon the state of the fluid flow, but in a given situation, h is nearly constant.

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An Introduction to Engineering Systems by Samuel Seely


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