Geometric configuration

The main point of this argument is to show that if particles with velocities v and v collide in the right geometric configuration with impact parameter b, such a collision will result in one of the particles having the velocity of interest, v, after the collision. These kinds of collisions which produce particles with velocity v. 

Laminar Flow Normally, laminar flow occurs in closed ducts when Nrc < 2100 (based on equivalent diameter = 4 X free area -i-perimeter). Laminar-flow heat transfer has been subjected to extensive theoretical study. The energy equation has been solved for a variety of boundaiy conditions and geometrical configurations. However, true laminar-flow heat transfer veiy rarely occurs. Natural-convecdion effects are almost always present, so that the assumption that molecular conduction alone occurs is not vahd. Therefore, empirically derived equations are most rehable. 

K depends upon geometrical configuration, cross-sectional area and length of ZnO Block... 

The flow in the diffuser is usually assumed to be of a steady nature to obtain the overall geometric configuration of the diffuser. In a channel-type diffuser the viscous shearing forces create a boundary layer with reduced kinetic energy. If the kinetic energy is reduced below a certain limit, the flow in this layer becomes stagnant and then reverses. This flow reversal causes... 

The value of the numerator of the right-hand side of Eq. (7.47) depends on the geometric configuration of the outlet Rq, Hq, cos0 ). The denominator represents the dimensionless distance from the outlet. For a given diffuser or a plaque Eq. (7.47) becomes... 

The efficiency depends on the fin geometrical configuration, the fin thermal conductivity, and the heat transfer coefficient at the fin surface. 

Fn = view factor or geometric configuration factor E = emissive power of emitting surface 2 = incident radiation-receiving surface... 

Figure 17 Viewgraph of the geometrical configuration of an eight-point star mandrel.

Shape parameters control the geometric configuration of a distribution. There may be zero, one, or multiple shape parameters. 

Crevices, deposits on metal surface or any geometrical configuration which results in differences in the concentration of oxygen or other cathodic depolarizers (e.g., Cu ). Metal in contact with the lower concentration—this follows from considerations of an equivalent reversible cell, although the situation is more complex in practice. 

Crevices or deposits on a metal surface or any other geometrical configuration that results in differences in the concentration of the cathodic reactant... 

Different types of crevices are shown in Fig. 1.49, and reference should also be made to Section 19.2 for other examples. The phenomenon is referred to as crevice corrosion, and is characterised by a geometrical configuration in which the cathode reactant (usually dissolved oxygen) can... 

If the metal has to be protected make provision in the design for applying metallic or non-metallic coatings or applying anodic or cathodic protection. Avoid geometrical configurations that facilitate corrosive conditions such as... 

The voidage (e) of abed of particles is the fraction of the bed volume occupied by the interstitial space between the particles. Its value depends upon the geometrical configuration of the beads, the pattern in which they are arranged within bed, the size distribution of the particles and the ratio of mean particle and contactor diameter. The bed voidage can be calculated using the following equation ... 

The principle of the radiation shield may be illustrated by considering the simple geometric configuration in which surfaces 1 and 2 and the shield may be represented by large planes separated by a small distance as shown in Figure 9.43. 

The width and thickness of the block, and the number, length, diameter, and spacing of the channels are not independent. The geometric configuration requires that the number of channels in a row, be... 

A chemical reactor is an apparatus of any geometric configuration in which a chemical reaction takes place. Depending on the mode of operation, process conditions, and properties of the reaction mixture, reactors can differ from each other significantly. An apparatus for the continuous catalytic synthesis of ammonia from hydrogen and nitrogen, operated at 720 K and 300 bar is completely different from a batch fermenter for the manufacture of ethanol from starch operated at 300 K and 1 bar. The mode of operation, process conditions, and physicochemical properties of the reaction mixture will be decisive in the selection of the shape and size of the reactor. 

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