By H. S. Yang, H. Nagai, N. Takano, M. Murakami (auth.), Quan-Sheng Shu (eds.)
In contemporary years, the know-how of cryogenic comminution has been greatly utilized within the box of chemical engineering, meals making, medication creation, and especially in recycling of waste material. as a result of the expanding pollutants of waste tires and the dearth of uncooked rubber source, the recycling technique for waste rubber items has turn into very important and commercially plausible. This expertise has proven numerous benefits corresponding to inflicting no environmental toxins, requiring low strength intake and generating top of the range items. for this reason, the conventional crusher which was once used to reclaim fabrics, similar to waste tires, nylon, plastic and plenty of polymer fabrics at atmospheric 12 temperature is being changed via a cryogenic crusher. • within the cryogenic crusher, the valuables of the milled fabric is mostly very delicate to temperature switch. while a crusher is in operation, it's going to generate loads of warmth that explanations the cloth temperature elevated. as soon as the temperature raises over the vitrification temperature, the cloth estate will swap and lose the brittle habit inflicting the power intake to upward push sharply. accordingly, the comminution technique can't be persisted. hence, it's believed that the cryogenic crusher is the main severe part within the cryogenic comminution method. The learn at the temperature elevate and effort intake within the cryogenic crusher is not just to lessen the strength intake of the crasher, but additionally to minimize the strength intake of the cryogenic system.
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Extra resources for Advances in Cryogenic Engineering
Trant, The Cryogenic Distribution Line for LHC: functional specification and conceptual design, paper presented at this conference. 2. M. D. L. Teague, in "Advances in Cryogenic Engineering, vol. 31 ", Plenum Press, New York (1985), 1285. 3. H. Danielsson, G. Perlin, B. Jenninger, C. -E. -M. Rieubland, Peformance of a superfluid helium safety relief valve for the LHC superconducting magnets, in "Advances in Cryogenic Engineering, vol. 41 ", Plenum Press, New York (1995), 805. 4. W. VanSciver. "Helium cryogenics", Plenum Press (1986) 178.
A dedicated test bench Advances in Cryogenic Engineering, Volume 45. , Kluwer Academic I Plenum Publishers, 2000. ___~I~ - YL'---- x .. Figure 1. Schematic view of the Kapitza resistance heatmeter and temperature profile has been developed to simulate the operating conditions of the LHC and to precisely determine the heat loads and mass leakage of such valves. 4 bar. The heat flow measurement is performed by measuring a temperature gradient across a calibrated thermal impedance2 . As the safety valves operate in superfluid helium, a Kapitza resistance was used as thermal impedance3.
100 <] 50 0 I -SO 0 2 4 6 8 10 12 Vg (m/ ) Figure 5. 77 K) Figures 4 and 5 compare the experiments with various models. As flow is stratified, the homogenous model gives worst results. Pressure losses are mainly due to the friction of vapour flow which explains the good agreement of vapour, Taitler and Dukler5 and Hanratty6 models at low Vgs, especially for large slopes where liquid occupies a small fraction of the cross section. Increasing Vgs results in a wavy interface with droplets dragging and Hanratty correlation has to be employed to represent flow behaviour.