Reaction zone width

Bolkhovitinov Viktorov (Ref 16) present diameter effect data for a number of expls including Soviet commercial expls, as shown in Table 3. (Note Trotyl is TNT.) Dj is D at infinite diameter d. The calculated (method of calcn not given) reaction zone width is a and the observed reaction zone width is a0 5 is mean square (sic) deviation presumably of a. 

Additional data on density and diameter effects is provided by Kegler (Ref 4) for RDX/TNT and HMX/TNT mixts. Fig 5 shows the variation of D (VQ in Kegler s notation) with initial density p with charge diameter 0 as a parameter. Fig 6 shows the variation of D with 1/0 (Eyring plot) with initial density as a parameter. Also shown are reaction zone widths as computed by the Eyring method... 

Aleksandrov et al (Ref 19) used an electromagnetic technique to get particle velocity (y) vs time profiles. They conclude that the breaks observed in such profiles coincide with the Chapman-Jouguet point, ie, the time of the break corresponds to the chem reaction time in a detonation. The reaction zone width, a, is then a = r (D — u)... 

A recent article (Ref 50 see Table 1 of Subsection A above) lists a=T. 1mm for 1.44g/cc RDX. Addition of various liqs generally increases the reaction zone width, as shown in Table 1 F. Characteristics of RDX Detonation Products. Volk (Ref 105) measured the fumes produced by the deton of RDX by gas chromatographic and chemiluminescence techniques. He identified h2, n2, co2, co, h2o, ch4, c2h6 c2h4... 

A recent article (Ref 50 see Table 1 of Subsection A above) lists a=l.lmm for 1.44g/cc RDX. Addition of various liqs generally increases the reaction zone width, as shown in Table 1... 

The architecture of such nanocomposites and the topochemistry of the metal layer over a transverse section of the polymer matrix are defined by a reaction zone width, which depends on the ratio between a diffusion coefficient D and a chemical reaction rate constant k. At D k the rate of metal particle deposition is limited by the diffusion rate, and the reaction zone width is minimal (Fig. 8-... 

The first case is characteristic for explosives having a broad chemical reaction zone. It may be obtained if very thin plates, of a thickness less than or equal to the chemical reaction zone width, are used. The detonation pressure may then be calculated as follows ... 

The determination of the detonation wave parameters and its structure on the basis of the determination of the shock wave velocity in an inert and optically transparent material using a laser follows the same principles as in the case of the aquarium test. However, if compared to the standard aquarium test, it is characterised by a better time resolution, on a nanosecond scale. Thus, this technique allows the study of the detonation wave structure, i.e., the chemical reaction zone width and the duration time (Ashaev et al., 1988). 

MicroChannel 50 pm X 400 pm Parallel microchannels 1000 Channel to channel spacing 50 pm Reaction zone width 10 cm Catalyst fihn Cu/Zn0/Al203, 5 pm thickness (0.0478 g/cm) Reactor layers 24 Total catalyst loading 2.87 g... 

Figure 7.19 illustrates the change of detonation cell size in a H2 + air mixture for a temperature rise in the range between 300 and 650 K. The points indicate measurements of the cells in tubes of various dimensions the lines show transverse cell size calculated on basis of the ZND model using a proportional relationship between the detonation cell size and the reaction zone width a/A = 51 [21]. 

Width of the Reaction Zone. The dimensions of the zones in the combustion waves of the Mo-B and Ta-C systems defined from the plots in Figures 6 and 8 are presented in Table I. The values of the reaction zone width in the system Mo-B are in good agreement with the data obtained earlier (20). 

Experimental evidence exists, which indicate that the reaction zone width on Ni is less than 1 pm [94]. The extension of the electrode process onto the YSZ surface is not well determined, but a value of less than 13 pm at 700 °C has been indicated based on experiments with Ni pattern electrodes [95]. 

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