Heat Pipes, 4th Edition by P. Dunn and David Reay (Auth.)

By P. Dunn and David Reay (Auth.)

It truly is nearly 10 years because the 3rd variation of Heat Pipes used to be released and the textual content is now verified because the usual paintings at the subject.

This new version has been generally up-to-date, with revisions to such a lot chapters. The advent of recent operating fluids and prolonged existence attempt information were taken into consideration in bankruptcy three. a few new sorts of warmth pipes became renowned, and others have proved much less potent. this is often mirrored within the contents of bankruptcy 5.

Heat pipes are hired in quite a lot of functions, together with electronics cooling, diecasting and injection moulding, warmth restoration and effort conservation, de-icing and production strategy temperature keep watch over, and bankruptcy 7 discusses the various most modern makes use of, whereas preserving complete information on these verified for plenty of years.

Appendices were up to date, as applicable

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Extra info for Heat Pipes, 4th Edition

Sample text

P - P Ä . r Pv P^-Pv This pressure difference P c — P 0 is small compared to the total capillary head r and may be neglected in heat pipe design. 4 Measurement of surface tension. 3). For our present purpose we are interested in Gf c o s θ as a measure of the capillary force. The simplest measurement is that of capillary rise h in a tube, which gives a / ' C O S 0 P= i ^ £ 2 In practical heat pipe design it is also necessary to know r, the effective pore radius. This is by no means easy to estimate for a wick made up of a sintered porous structure or from several layers of gauze.

In such cases compressibility effects must be taken into account. Sonic conditions set one limit to the maximum possible heat transport capability of a heat pipe. Other limits are set, at low temperatures, by viscous forces; and at increasing temperature limits arise due to entrainment of the working fluid in the wick by the vapour stream, by insufficient capillary head and by evaporator burnout. 1) on maximum axial heat transport are shown in Fig. 1. Temperature Fig. 1 Limitations to heat transport in the heat pipe It is necessary for the operating point to be chosen in the area lying below these curves.

4 obtained previously. 13 51 Theory of ΔΡ ν β, giving only partial pressure recovery. 15 μ γ ν 4 v Busse also considered the one dimensional case, assuming a modified HagenPoiseuille velocity profile and using this to obtain a solution of the Navier-Stokes equation for a long heat pipe. r, (l 2 [ "(9 L « , l27 4 8A 23A Y 27 405 JJ 2 V 405* JJ W e recognise the first term in each of the above equations as the viscous contribution to pressure gradient arising in laminar flow. The remaining terms take account of inertial effects.

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