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r 0 2 r r 3 ( , 0) r r 0 in Visual Studio .NET Creator Code 39 Full ASCII in Visual Studio .NET r 0 2 r r 3 ( , 0) r r 0




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r 0 2 r r 3 ( , 0) r r 0 use .net vs 2010 qrcode generator tomake qr barcode on .net Postal Alpha Numeric Encoding Technique r r n ( )d r . 2 r 3. 2 ( )d n r r (11.14). Sirignano et al. considered the case in which the inlet condition is uniform over the cross-sectional area of the inlet; i.e.

, ( , 0) = 1. r. Film Vaporization Figure 11.3. contours for parabolic axial-velocity pro le.

Pe = 500. Air ows from left to right. Dashed curve gives heptane- ame contour.

. The local nondimensional vap QR for .NET orization rate per unit area can be determined as a function of downstream position, with the neglect of Stefan convection, by relating it to the normal gradient of the scalar at the interface. The result is mR 2 = [ YO + YF s ] D r .

n=1 cn e kn x i e n i /4. m 1 p=0 (1. 2 p n ). [m!]2. i2m 1 . (11.15). Integration over the axial c oordinate and the circumference gives the total nondimensional vaporization rate over the liquid surface of length L: R 0 mdx = 2 D[ YO + YF s ]. L/R n=1 cn kn L/R 2 1 i e n i /4 e kn m 1 p=0 (1. 2 p n ). [m!]2. i2m 1 . (11.16).

In the plug- ow limit of = VS .NET qrcode 0, we have mR 2 = [ YO + YF s ] D r R 0 mdx = 2 D[ YO + YF s ]. L/R n=1 n=1 e kn x ,. (11.17). 1 e kn L/R . kn (11.18). The major effect of fuel cho ice on vaporization effect comes through the parameter YO + YF s . A very minor in uence occurs for the case with a parabolicvelocity pro le through the liquid viscosity that affects n and kn and thereby has the small in uence on the vaporization rates. 11.

3.5 Results Figure 11.3 shows solutions of Eqs.

(11.9) and (11.14) for Pe = 500 and for a base ow with parabolic axial-velocity pro le (i.

e., = 0). The solution for the scalar does not depend on the choice of fuel; however, the contour value giving the.

11.3 Analysis of Liquid-Film Combustor Figure 11.4. contours for parabolicvelocity pro le.

Pe = 1000. Dashed curve gives heptane- ame contour..

0.4 0.3 0.

2. 0. 7. 0.1 0 0 0.025.

thin- ame contour does depen d on the fuel and oxidizer and the liquid temperature. The dashed curve shows the ame contour for the heptane lm at a bulk temperature of 298 K vaporizing into the gas stream with air as the in owing gas. The value decreases with an increase in the value of the radial coordinate or of the axial coordinate.

An increase of the Peclet number results in the relocation farther downstream of a contour curve representing a given value of the scalar. See Fig. 11.

4 for the case in which Pe = 1000. In fact, for Peclet number of 750 and above, the results essentially collapse to a function of r and x/Pe, as noted previously. More terms in the series solution of Eq.

(11.9) are required for a converged solution as x becomes smaller. So we nd some error in the contours for values of x/Pe < 0.

003. For this small region, especially at higher r values, 52 terms in the summation of Eq. (11.

9) did not give convergence. These contours do not depend on the particular fuel that is used or the liquid interface temperature because the scalar in Eq. (11.

9) goes to zero value at the liquid interface. The value of at the ame position will depend upon the choice of fuel and the liquid interface temperature. Figure 11.

5 shows results for the plug- ow limit. Again, the results collapse to a function of r and x/Pe only for large Peclet numbers; the results for Pe = 100 and 500 are essentially superimposed. The results are qualitatively similar to the parabolic pro le results, but for a given value of , the contour line extends farther downstream.

This can be expected because, for the same Peclet number, the plug ow has a greater average velocity than the parabolic ow. The ame position for heptane fuel at a bulk temperature of 298 K is shown in Fig. 11.

6 at three different Peclet numbers under the assumption of in nite chemical kinetic rate so that a ame of zero thickness results. As expected, the ame moves farther downstream with increasing Pe. At Pe = 500, the combustion is completed at approximately 12.

5-diameter length, as indicated by the ame collapsing to a point on the axis. The results for Pe = 750 and 1000 superimpose when plotted versus x/Pe. If relatively high mass ows and relatively short chamber lengths are desired, .

0.9 9.
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