Drag plate

A drag plate, used for slowing down bomb flights, is an 8-inch square sheet metal with four protruding tabs, each contg a tapped hole which accommodates a screw. When the plate is placed over the rear end... 

Bomb dusters, incendiary 4 D962 Bomb complete round 2 B223 Bomb delay elements 4 D1014 Bomb drag plates and spoiler rings 4 D1021 Bomb drop tests 1 VIII... 

Fig.1 Diagram of clinker handling system at a cement works 1 drag-chain or short-plate apron conveyor 2 bucket conveyor or short-pan apron conveyor 3 drag-plate apron conveyor for material distribution 4 short-plate apron conveyor for extraction from hoppers 5 short-pan apron conveyor for collecting 6 bucket elevator 7 drag-plate apron conveyor 8 weigh belt feeder 9 belt conveyor...

The drag-plate apron conveyor is usually equipped with side plates 150 mm or 200 mm in height. Recommended speeds are between 0.1 and 0.3 m/second. The attainable handling rates can be taken from Table 16 simply by halving the values for the side plate heights of 300 mm and 400 mm respectively, except that if decidedly coarse material is to be handled (300—500 mm particle size), a much smaller reduction need be applied about 20%. For preliminary planning purposes an overall height of 2200 mm and a width equal to 800 mm more than the net width... 

Fig. 16 Possibilities for using the drag-plate apron conveyor...

FIGURE 1.127 Mold with auxiliary parting plane and drag plate (a) Mold closed (b) mold open, position for the part removal and application of the mold release... 

RoUs and other relatively simple shapes make use of inert shields and thieves to avoid edge buildup and produce a more even plate thickness. For more compUcated shapes having deeper recesses thicker deposits from cyanide copper baths have been used as an undercoat to the copper sulfate deposit. Acid copper baths operate near 100% efficient over a wide current density range. The cathode efficiency is usuaUy slightly less than the anode efficiency, bringing about a slow increase in copper unless drag-out losses are high. 

Chilton-Colburn analogies, Ns = 1-0, (gases), f = drag coefficient. Corresponds to item 5-21-F and refers to same conditions. 8000 < Nr < 300,000. Can apply analogy, jo =//2, to entire plate (including laminar portion) if average values are used. 

The total drag on the plate of length L and width b for a laminar boundaiy layer, including the drag on both surfaces, is ... 

AP is the pressure drop, cm of water Pg is the gas density, g/cm Ap is the total projected area of an entire row of baffles in the direction of inlet gas flow, cm" and At is the duct cross-sectional area, cm". The value jd is a drag coefficient for gas flow past inclined flat plates taken from Fig. 14-113, while L/ is the actual gas velocity, cm/s, which is related to the superficial gas velocity by U = L/g/cos 0. It must be noted that the angle of incidence 0 for the second and successive rows of baffles is twice the angle of incidence for the first row. Most of Calverts work was with 30° baffles, but the method correlates well with other data on 45° bafiles. 

FIG. 14-113 Drag coefficient for flow past inclined flat plates for use in Eq. (14-228). Calveii, Yung, and Leung, NTIS Puhl. PB-24S050 based on Page and Johansen, Proc. R. See. (London), H6A, 170 (1927).]... 

We consider flow through a cake with the membrane located at a distance, x, from the filter plate. Neglecting all forces in the cake other than those created by drag and hydraulic pressure, a balance from x to L gives ... 

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