Metal mesh

Metal A filter constructed from metal mesh, fibers, or sintered porous metal. 

Hands - metal mesh gloves, fire resistant gloves, and insulted gloves... 

Fluidised bed The fluidised bed consists of two boxes on top of one another. The top and larger one contains the powder, and the lower one is separated from it by metal mesh and a semipermeable membrane. Air is pumped under pressure into the lower compartment and then diffuses through the membrane and through the powder. The powder particles are lifted and separated by the air. This results in a considerable reduction in the bulk density so that the item to be coated can easily be submerged in the powder. 

Piping circuits will usually contain a small quantity of dirt, scale and swarf, no matter what care is taken to keep these out. A strainer is fitted in the compressor suction to trap such particles before they can enter the machine. Such strainers are of metal mesh and will be located where they can be removed for cleaning. In some configurations two strainers may be fitted. 

Oil strainers may be of metal mesh and within the sump, in which case the sump must be opened for cleaning. Self-cleaning disc strainers are also used, the dirt falling into a drain pot or into the sump itself. There is an increasing tendency to provide replaceable fabric oil filters external to the compressor body, following automobile practice. 

Most catalysts consist of active components dispersed as small crystallites on a thermally stable, chemically inactive support such as alumina, ceramics, or metallic wires and screens. The supports are shaped into spheroids, cylinders, monolithic honeycombs, and metallic mesh or saddles. 

The three principal catalyst bed configurations are the pellet bed, the monolith, and the metallic wire meshes. An open structure with large openings is needed to fulfill the requirement of a low pressure drop even at the very high space velocities of 200,000 hr-1. On the other hand, packings with small diameters would provide more external surface area to fulfill the requirement for rapid mass transfer from the g .s stream to the solid surface. The compromise between these two ideals results in a rather narrow range of dimensions pellets are from to 1 in. in diameter, monoliths have 6 to 20 channels/in., and metallic meshes have diameters of about 0.004 to 0.03 in. 

Fig. 1. Schematic diagram of the multimass ion imaging detection system. (1) Pulsed nozzle (2) skimmers (3) molecular beam (4) photolysis laser beam (5) VUV laser beam, which is perpendicular to the plane of this figure (6) ion extraction plate floated on V0 with pulsed voltage variable from 3000 to 4600 V (7) ion extraction plate with voltage Va (8) outer concentric cylindrical electrode (9) inner concentric cylindrical electrode (10) simulation ion trajectory of m/e = 16 (11) simulation ion trajectory of rri/e = 14 (12) simulation ion trajectory of m/e = 12 (13) 30 (im diameter tungsten wire (14) 8 x 10cm metal mesh with voltage V0] (15) sstack multichannel plates and phosphor screen. In the two-dimensional detector, the V-axis is the mass axis, and V-axis (perpendicular to the plane of this figure) is the velocity axis (16) CCD camera.

One of the key components in the system is the mass spectrometer. Fragments are ionized by a VUV laser pulse between a pair of plane parallel-plate electrodes (6 x 14 cm). One of the plane electrodes has a slit of 1 x 10 cm, which is covered by a metal mesh. The slit is parallel to the VUV laser beam and is the entrance of the mass spectrometer. Ions are accelerated by a pulsed electric field present between the plane parallel-plate electrodes, and then pass through the slit before they enter the mass spectrometer. 

The build up of pressure is aided by the use of a breaker plate, which is a thick disk of perforated metal positioned just downstream of the tip of the screw. A screen pack, comprising layers of woven metal mesh, is placed on the upstream side of the breaker plate. The screen pack increases back pressure within the metering zone and acts as a filter to catch any extraneous material that may have entered the extruder. 

Kargi, F., and Toprak, H., Rational Design of Metal Mesh Particles for Biological Fluidized Bed Reactors, J. Chem. Tech. Biotechnol., 59 201 (1994)... 

Flat conveyors can be constructed from fabric or rubber/fabric with or without a rubber surface layer. For some applications it may be desirable to use a metal mesh or chain construction. 

As can be seen in Fig. 5.44 as well, flames in gas heaters have a similar emission spectrum. Besides the UV surveillance ionization electrodes are often used in gas burners. The method is cheap and secure but it disturbs the combustion process since the electrode has to be placed close to the flames. New developments in gas heaters focus on catalytic combustion on a metal mesh. There, an ionization electrode would fail due to the lack of a flame. However, the characteristic UV emission is still present... 

FIGURE 4.9 Electrochemical performance of the LSCF cells tested with various raw chro-mia-forming metal meshes. Performance of the LSCF cell tested with no mesh was also plotted for comparison [203],... 

Each type of pressure leaf filter features a pressure vessel in which are located one or more filter elements or leaves of circular or rectangular construction. The filter media may be in the form of a synthetic fibre or other fabrics, or metallic mesh. Supports and intermediate drainage members are in coarse mesh with all components held together by edge binding. Leaf outlets are connected individually to an outlet manifold which passes through the wall of the pressure vessel. 

In electrochemical systems, metal meshes have been widely used as the backing layers for catalyst layers (or electrodes) [26-29] and as separators [30]. In fuel cells where an aqueous electrolyte is employed, metal screens or sheets have been used as the diffusion layers with catalyst layers coated on them [31]. In direct liquid fuel cells, such as the direct methanol fuel cell (DMFC), there has been research with metal meshes as DLs in order to replace the typical CFPs and CCs because they are considered unsuitable for the transport and release of carbon dioxide gas from the anode side of the cell [32]. 

Similar metal sheets have also been used as DLs in the cathode of PEMFCs. Wilkinson et al. [37,38] presented the idea of using fluid distribution layers made out of metal meshes with electrically conductive fillers inside the holes of the meshes. A very similar idea was also presented by Fiamada and Nakato [39]. Eosfeld and Eleven [40] presented another example of fuel cells that use metal meshes as diffusion layers along with metal FF plates. 

In most of these studies, the meshes used were expanded metals that are readily available because they are used in many industries. Expanded metals are usually made with a precision die that slits and stretches the material in a single operation. The material then goes through a set of rollers so that the desired thickness can be obtained [41]. Figure 4.7 shows pictures of an expanded metal mesh similar to those used as DLs in fuel cells. 

It is important to menhon that sintered metal meshes are widely used as the diffusion layers in unitized regenerahve polymer fuel cells (URECs) and... 

R. Chetty and K. Scott. Direct ethanol fuel cells with catalyzed metal mesh anodes. Electrochimica Acta 52 (2007) 4073-4081. 

Also used in wire or cable coatings impregnants in cotton and asbestos braided insulation coating on glass air filter pads, metal mesh to filter air and gas streams (Monsanto, 1960). 

Figure l Schematic of pre-concentrator designed to trap particulate matter including traces of explosives on a metal mesh screen. After a sample collection step, the apertures are closed, gas is passed at a low flow rate over the mesh which is resistively heated to 200°C or more, releasing vapors into the gas flow and passed to an analyzer, commonly an ion mobility spectrometer. 

Figure 2 Photographs of pre-concentrators of various sizes. Apertures are seen in each assembly and the metal mesh is found behind the aperture. Apertures are electro-mechanically actuated and move in a manner found in some photographic equipment.

Figure 4 The miniature pre-concentrator (left) and the incorporation of the preconcentrator with a commercial handheld IMS analyzer, known in combination as the Hound. The metal mesh of the preconcentrator can he seen in the photo (left).

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