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By H. S. Yang, H. Nagai, N. Takano, M. Murakami (auth.), Quan-Sheng Shu (eds.)

In fresh years, the know-how of cryogenic comminution has been commonly utilized within the box of chemical engineering, nutrition making, medication construction, 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 develop into vital and commercially manageable. This know-how has proven various benefits akin to inflicting no environmental toxins, requiring low strength intake and generating top of the range items. accordingly, the conventional crusher which was once used to reclaim fabrics, akin to waste tires, nylon, plastic and lots 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 is going to generate loads of warmth that factors the cloth temperature elevated. as soon as the temperature raises over the vitrification temperature, the fabric estate will switch and lose the brittle habit inflicting the power intake to upward push sharply. for that reason, the comminution technique can't be endured. as a result, it really is believed that the cryogenic crusher is the main serious part within the cryogenic comminution procedure. The study at the temperature bring up and effort intake within the cryogenic crusher is not just to minimize the strength intake of the crasher, but additionally to minimize the strength intake of the cryogenic system.

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For small liquid mass flow rate (pru/<

Thus, the data in Fig. 4 should be due only to the hydraulic resistance of the channel and be proportional to m2 . Also plotted in Fig. 4 is the predicted level increase based on the isothermal flow measurements. Clearly, the level increase for the non-isothermal flow is significantly larger than expected. Such an increase in level difference could result from a small increase in the ~T across the channel, however, no measurable shift was observed in the data. Alternatively, the shift could be caused by an increase in the friction factor, but there is no mechanism to justify such a shift.

In addition to the determination of the thermal flow to the superfluid helium, mass leakage across the seat, heat load to the l 00 K thermal anchoring and the effect on convection in the discharge pipe were measured. The convection heat transfer effects in the discharge pipe were of particular interest, for they confirmed the importance of the geometry of the connection to the 20 K recovery line. Such a measurement is presented in figure 6, where it can be seen that the convection totally offsets the conduction heat load for one of the valves while for the other one the effect is much less pronounced.

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