Download e-book for iPad: Abraham Pressman Switching Power Supply Design by Abraham Pressman, Keith Billings, Taylor Morey

By Abraham Pressman, Keith Billings, Taylor Morey

ISBN-10: 0071167072

ISBN-13: 9780071167079

Классическая, по праву считающаяся одной из лучших, книга по разработке импульсных источников питания.
Смело может быть рекомендована на роль настольной книги инженера.
Содержит массу примеров расчётов, без излишнего теоретизирования.

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Sample text

1 Heat Transfer and Pumping Power in Short Channels Consider the two flow configurations shown in Figs. 3a, b. Case 1, shown in Fig. 3a, depicts flow in a single long tube with hydraulic diameter of Dh, tube 44 2 Force-Fed Microchannels for High Flux Cooling Applications _ constant surface temperature Ts, and inlet temperature Ti. length L, mass flow rate m; This case is analogous to a single channel in a TMHS with a highly conductive microgrooved surface base material. The second case, Case 2, shown in Fig.

23 is absent. The dominant effects of surface tension and liquid viscosity in the 222 and 140 lm channels prohibit turbulence and agitation of the gas–liquid interface, as suggested by Chung and Kawaji (2004), Kandlikar and Grande (2003), and Kawahara et al. (2002). The large asymmetric interfacial waves seen in the 506 and 334 lm channels become thin and axially symmetric in the 222 and 140 lm channels, due to the stronger influence of surface tension on the liquid film structure. That is to say, the separated air and water flow becomes laminar, and the mixing effect disappears, reducing heat transfer.

Ts À To;2 pDh L=n " pDh L " ¼ exp À h ¼ exp À h ð2:4Þ m_ = cp _ p mc Ts À Ti n The right-hand sides of Eqs. 4) are identical, which indicates that for the two cases the outlet temperatures are equal. 5) are equal, which indicates that the heat transferred from both the single-tube configuration of Case 1 and the multiple tubes with the same hydraulic diameter and heat transfer area of Case 2 is the same. Since inlet temperature is constant and equal for both cases, the heat sink heat transfer coefficients will be the same as well.

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Abraham Pressman Switching Power Supply Design by Abraham Pressman, Keith Billings, Taylor Morey

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