✍ Scribed by J.W.L. Köhler; P.F. Stevens; A.K. de Jonge; D.C. Beuzekom
No coin nor oath required. For personal study only.
Up to now the losses of regenerators used in ~generative refrigerators could only be calculated with Hausen's theory. One expects deviatioos, however, when applying this theory to present-day machines which can operate below 20 K, due to the anomalous behaviour of gases and matter in this temperature range. This paper presents the results of a new approach to the problem wherein nearly all effects influencing regeneration have been incorporated. Results are expressed in two kinds of solutions, that is, "exact" solutions where nothing is neglected and "zeroth order" solutions, obtained with much simpler calculations using suitable approximations. The authors conclude that above about 18 K "zeroth order" solutions are sufficiently reliable; below that point, "exact" calculations are probably inescapable.
📜 SIMILAR VOLUMES
A transient three-dimensional model of a porous regenerator operating at room temperature is presented. The solid magnetic material and the regeneration fluid are modeled separately. The fluid flows through interstitial channels formed by a regular matrix of solid particles. The velocity, pressure a