Ring internals

The need for a clamp-ring, internal floating-head, shell and tube-type heat exchanger for use as a steam superheater is determined. The... 

Zheng, C. G., Ding, Y., Xia, Y. S., Bin, H. and Kwauk, M. (1991). Voidage Redistribution by Ring Internals in Fast Fluidization. In Fluidization 91 Science and Technology. Ed. Kwauk and Hasatani. Beijing Science Press. 

Dapivirine (TMC120) TMC120 Vaginal Gel Gel and vaginal ring International Partnership for Microbicides Phases MI... 

When two units of the ring internals were installed at H — 2.25 m and H = 4.75 m, the dense-phase region was cut into three layers with a dilute influence zones in between and was thereby itself extended upward, while the solids inventory remained the same. Voidages e for the dilute-phase region and ea for the dense-phase region remain essentially the same, as shown in Fig. 31. In the influence zone of the internals, the radial voidage distribution is considerably flattened, as shown in Fig. 32. Reduced solid concentration in an influence zone is instrumental in suppression of solids mixing between adjacent dense-phase layers. 

Figure 34 compares the residence time distribution in the influence zone of a single set of ring internals at location 3, which is 0.55 m downstream of tracer injection, with and without the ring set. The decrease of solids backmixing is shown by an increase of the Peclet number from 1.06 to 2.46, and from 1.97 to 3.61, when the ring set is used, for gas velocities of 1.75 and 2.62 m/s, respectively. 

Fig. 31. Axial voidage profiles with and without ring internals (O, without ring internals , with ring internals) (Zheng et at, 1992).

There are several structures of five-membered ring internal esters of boronic acids. These compounds are shown in Figure 3 and the B-O bond distances are tabulated in Table 3. These B-O distances vary over only a small range... 

Figure 3 The formulas of five-membered ring internal esters of boronic acids which have been structurally characterized by X-ray crystallographic studies.

Fig. 9. Geometrical arrangement of Trp-29 in erabutoxin b. Coordinate system of a spherical protein and tryptop-hanyl residue are shown by (x y z ) and (xyz), respectively. The origin of (x y z ) system is chosen at the CH2 group connecting the peptide chain and indole ring. Internal rotation of the tryptophan from the (x y z ) system to the (xyz) system is expressed with Euler s angles (a6y). The location of the quencher, -NHg of Lys-27, is also illustrated in the Fig. Polar coordinates of the N atom of the quencher in the system (x y z ) are indicated by a and 3q (33). ...

Number of atoms in ring Internal angle In planar ring 109.5°— internal angle ... 

SKUA, a burst-mpde. critical assembly under construction, will be an approximate unit-height-to-diameter (0.318 m) cylinder of annular U (93%) fuel rings, internally moderated by ZrHi.a and externally reflected by Cu. When complete, SKUA will be able to vaporize a foil in the flux trap during a burst. 

Lee, J.H. (1988) Upper bound analysis of the upsetting of pressure-sensitive polymeric rings, International Journal of Mechanical Science, 30 601-12. 

Zheng CG, Tung YK, Xia YS, Hun B, Kwauk M. Voidage redistribution by ring internals in fast fluidization. In Dwauk M, Hasatani M, eds. Fluidization 91. Science and Technology. Beijing Science Press, 1991, pp 168-177. 

Co-Mo-Cr-Si PA, HVOF rocker arms, piston rings (internal combustion), cylinder liners... 

Nautiyal, P.C., Singhal, S. and Sharma, J.P., "Analysis of Wear Mechanism of Piston Ring", International Conf. on Wear of Materials Wear of Materials 1979, ASME, April 16-18, 1979, pp. 124-131... 

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