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Download Heat Pipes, Fifth Edition: Theory, Design and Applications by Ryan McGlen, Peter Kew, David Reay PDF

By Ryan McGlen, Peter Kew, David Reay

Warmth pipes are utilized in a variety of functions, together with electronics cooling, die-casting and injection moulding, warmth restoration and effort conservation, de-icing and production technique temperature keep watch over, and in family home equipment. a necessary advisor for working towards engineers and a great textual content for postgraduate scholars, the ebook takes a hugely functional method of the layout and choice of warmth pipes. it really is either an invaluable sourcebook and an obtainable creation for these coming near near the subject for the 1st time. *Long proven because the ordinary paintings on warmth pipes*Suitable to be used as a certified reference and graduate textual content; includes all details required to layout and manufacture a warmth pipe*Revised with larger insurance of key electronics cooling software and a brand new layout advisor

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Additional info for Heat Pipes, Fifth Edition: Theory, Design and Applications

Example text

It is obvious that previous work on the Perkins tube had revealed that purging of the tubes of air, possibly by boiling off a quantity of the working fluid prior to sealing, was desirable, as Perkins and Buck indicate that this should be done for optimum operation at low temperatures (hence low internal pressures) and when it is necessary to transmit heat as rapidly as possible at high temperatures. Safety and optimum performance were also considered in the patent, where reference is made to the use of ‘suitable stops and guides’ to ensure that tubes refitted after external cleaning were inserted at the correct angle and with the specified amount of evaporator section exposed to the heat source (normally an oil, coal or gas burner).

G. N/m. Values for surface tension for a number of common working fluids are given in Appendix 1. Since latent heat of vapourisation, L, is a measure of the forces of attraction between the molecules of a liquid, we might expect surface energy or surface tension l to be related to L. This is found to be the case. Solids also will have a free surface energy, and in magnitude it is found to be similar to the value for the same material in the molten state. θ (b) (a) L (c) θ F σl R P1 P2 ΔP = P1 – P2 = 2σ1/R σl Fig.

In order to increase the surface area, work must be done on the liquid. The energy associated with this work is known as the free surface energy, and the corresponding free surface energy per unit surface area is given the symbol l . For example, if a soap film is set up on a wire support as in Fig. 2a and the area is increased by moving one side a distance dx the work done is equal to and the work done is equal to F dx, hence the increase in surface energy is 2 l l dx. The factor 2 arises since the film has two free surfaces.

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