Annular geometry

J3. Janssen, E., and Kervinen, J. A., Burnout conditions for single rod in annular geometry, GEAP-3899 (1963). 

The surface deposit (or scale) in flow boiling has been observed on many occasions, but no adverse effect on CHF has been reported. Knoebel et al. (1973) developed a subcooled DNB correlation f rom annular geometry with stainless steel and aluminum for ATsub > 45°F (25°C) ... 

Figure 1. Collection efficiency (f)for a denuder of annular geometry in which only the inner surface of the annulus is a sink as a function of axial position X (see equation 14). The curves are based on numerical data in reference 54. From top to bottom, the traces correspond to dj/d0 = 1.0, 0.5, 0.25, 0.1, 0.05,...

These considerations pertain largely to automated systems. In systems utilizing manual collection and analysis, the annular geometry does have advantages, as evident from its current widespread use. 

Annular Geometry DS Devices. The leakage problems associated with a 2- xm-pore PTFE membrane tube were solved by Tanner et al. (53) by adopting the annular geometry. Air flows through the annular space of... 

Recently, the annular geometry porous membrane DS coupled to a fluorometric detection system was shown to be applicable to the sensitive measurement of ambient ammonia (59). The detection scheme is based on... 

The Biostream rotationally stabilized free-flow electrophoresis device, based on the Philpot-Harwell design (Figure 4), uses an annular geometry stabilized against radial convection by rotation of the outer cylinder. Carrier buffer and feed are injected at the base of a vertical annulus and move axially upward to fraction collectors at the top. 

For the annular geometry presently considered, the parameter C2 back diffusion, is... 

The results of Bennett and Kearsey [75] for superheated steam flowing in an annulus are included in Fig. 11.10. The data of Brauer [76] suggest that the optimum Pie for an annular geometry is approximately 3. 

E. Janssen and J. A. Kervinen, Burnout Conditions for Single Rod in Annular Geometry, Water at 600 to 1400 psia, General Electric Atomic Power 3899, GEAP, San Jose, CA, 1963. 

In this work are obtained generalized Reynolds and Hedstrom numbers connected with a three parameter rheological model to correlate the friction coefficient for the laminar, transitional and turbulent regime in annular flow. The use at experimental data covering a considerable range of dimensionless numbers for the flow of bentonite suspensions leads to a calculation technique for the transition velocity and pressure drop of these suspensions in annular geometries. 

From eqs. (5) to (10) it is possible to obtain the pressure drop for the laminar regime of the suspensions that follows the Robertson and Stiff of this model flowing on a given annular geometry. The development parallels that one made by Hanks J for the Herschel and Bulkley rheological model. 

System n- (g/cm ) Rheological Parameters Annular Geometry Pilot Plant (Ref. n-)... 

Arranging the configuration in an annular geometry with the same coolant fraction and fuel fraction was not found to be helpful in decreasing the void reactivity effect. In fact, slightly more positive effects are found, although the results were within two standard deviations of each other. It is unclear as to why the effects could be slightly more positive. 

VUV irradiation experiments. For the VUV irradiation experiments, an excimer lamp emitting at 172 nm (200 mm long, 35 mm diameter was used. The lamp was immersed in a photochemical reactor of annular geometry and a total volume of 400 ml. The reactor was immersed in a water-bath at constant temperature. 

Criticality and power distribution measurements were made with clean uniform hexagonal arrays of these elements with the interior coolant annuli both voided and flooded for the purpose of checking analysis methods. Double annular fuel elemaafs are oi Interest In the design of integrail nuclear superheat reactors.- The double annular geometry of the elements required extension of... 

All seven of the industrial excursions provide useful data. Two are representative of particular types annular geometry and concentration buildup. Of the remaining, two involved volumes of <65 liter, two more for which the volumes are not given in the published excursion tables, and one in an 800-liter volume. Summarizing the accidental solution excursion data, there appear to be two special cases, two typical smaller excursions at volumes of <65 liter but only one at the more reasonable process-area tank volume of 800 liter. 

Consider a different electrode configuration, namely an annular geometry with the outer electrode at radius having a potential and the Inner electrode at radius r, having a potential V, with an electrolytic solution in between. Develop an expression for E in this nonuniform electrical field. 

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