No abstract

No abstract

SUMMARYThis paper presents a mathematical model of a pair of fixed matrix regenerators employed as an autodefrosting device in an air cycle freezing and cooling plant. Measurements made on a pilot plant show that the model predicts the major characteristics correctly, in particular and most importantly, the autodefrosting characteristic. The conclusions are that the plant performance 'proves the concept' but further experimental work is needed to calibrate the regenerator model.

This paper presents a mathematical model of a pair of fixed matrix regenerators employed as an autodefrosting device in an air cycle freezing and cooling plant. Measurements made on a pilot plant show that the model predicts the major characteristics correctly, in particular and most importantly, the autodefrosting characteristic. The conclusions are that the plant performance ‘proves the concept’ but further experimental work is needed to calibrate the regenerator model. © 1998 John Wiley & Sons, Ltd.

Abstract.A finite element solution is given for the coupled heat and mass transfer taking place when a vapour with considerable heat of absorption is absorbed into a laminar film flow. Convection and diffusion parallel and perpendicular to the direction of flow are taken into account. Temperature and mass fraction profiles across the film are given as well as results in film flow direction for several values of the Peclet number. Comparison with a solution based on one-dimensional flow and diffusion perpendicular to the flow, shows that deviations from this case by our two-dimensional solution increase for decreasing Peclet number. Finite Elemente Liisung der gleichzeitigen zwei-dimensionalen