By Robert A. Ackermann
An in-depth survey of regenerative warmth exchangers, this publication chronicles the improvement and up to date commercialization of regenerative units for cryogenic functions. Chapters conceal ancient historical past, techniques, useful purposes, layout facts, and numerical recommendations, delivering the newest info for engineers to boost complex cryogenic machines. The discussions contain insights into the operation of a regenerator; descriptions of the cyclic and fluid temperature distributions in a regenerator; facts for varied matrix geometries and fabrics, together with coarse and positive bronze, stainless steel-woven cord mesh monitors, and lead spheres; and designated working gains of cryocoolers that produce deviations from perfect regenerator theory.
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Additional info for Cryogenic Regenerative Heat Exchangers
2. 0 x 106 N/m2) are generally encountered, and pressure changes are small and occur with moderate time constants. 3. The working fluid is generally one of the cryogenic gases and, with the exception of very-low-temperature applications, the gas can be treated as a perfect gas. 7 bars would lead to a 5% change in the density. Generally, in a well-designed regenerator, where the goal is to minimize the pressure drop of the flowing fluid, we have KPo'« 1, and the flow can be treated as incompressible.
65) The physical interpretation of the Nusselt number is that in convective heat transfer, heat transfer between a solid and fluid flowing over the solid occurs in a thin, boundary layer region of the fluid near the surface of the solid. When the fluid velocity and turbulence are small, the transfer of heat between the fluid and wall occurs mostly by conduction and is not aided materially by mixing currents on a macroscopic scale. Conversely, when the velocity is large and the mixing between warmer and colder fluid contributes substantially to the heat transfer, the conduction mechanism becomes less important.
During the previous heating period, and being wanned to the hot temperature by the matrix material. The regenerator temperature distributions shown in Fig. 8 represent the fluid temperatures at the beginning of each period and the matrix temperatures corresponding to the maximum temperature swing of the matrix material over a complete cycle. lt. 46) where hh is the heat transfer coefficient between the wall and the wann fluid, W is the heat transfer area per unit length of the wall in contact with the warm fluid, and Tw1 is the wall temperature.