It is proved that the asymptotic series for the leading term K ∞ (a) of the Keesom integral K(a) obtained by us in a previous paper (2004 J. Phys. A: Math. Gen. 37 9677), in order to evaluate K(a) for large values of the interaction parameter a, is indeed an asymptotic expansion of K(a) itself.
Experimental results are given which demonstrate the influence of solid-state screens on the radiation of an expanding laser-produced plasma. We have discovered the effect of the nonmonotonic intensity of radiation of a recombining plasma during its encounter with a shock wave reflected from the screen. A theory of this effect is proposed for the case where a change in the ionic composition in a shock wave is insignificant, and numerical calculations have been made.
Heat dissipation is one of the most important issues for the reliability of electronic equipment. Boiling can be a very efficient heat transfer mechanism when used to face with the electronic technology needs of efficient and compact heat sinks. Recently, cellular structured materials both stochastic and periodic, particularly open cell metal foams, have been proposed as possible enhanced surfaces to lower the junction temperatures at high heat fluxes. Up today, most of the research on metal foams only regards single phase flow, whereas the two phase flow is still almost unexplored. This paper presents an experimental study on the heat transfer of R134a during flow boiling inside a 5 PPI (Pores Per linear Inch) copper foam, which is 5 mm high, 10 mm wide and 200 mm long, and it is brazed on a 10 mm thick copper plate. The experimental measurements were carried out by imposing three different heat fluxes (50, 75, and 100 kW m -2 ) and by varying the refrigerant mass velocity between 50 and 200 kg m -2 s -1 and the vapour quality from 0.2 to 0.90, at constant saturation temperature (30°C). The effects of the refrigerant mass flow rate, heat flux and vapour quality on the heat transfer coefficient, dry out phenomenon, and pressure drop are studied.
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