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Materials Engineering: Flow control: A novel use for porous metal
as 0.01 in., or less. Single orifices and capillary tubes are also sensitive to the presence of particulate matter in the gas stream that could deposit in the orifice and adversely alter the gas flow rate versus pressure drop. "In contrast, porous metal-flow restrictors contain hundreds of small pores...
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MICRO: Tool/Fab Automation
because boxes are enclosed, plastic, and porous environments that can concentrate contaminants, particularly organic compounds. To address that problem, manufacturers have been attracted to the use of inert and pure gas to purge storage and transport boxes in sensitive manufacturing applications...
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Copper
resistance to inorganic acids. One corrosive situation encountered, particularly in the high-zinc alloy, is dezincification. The brass dissolves as an alloy, but the copper constituent redeposits as a porous, spongy metal. Meanwhile, the zinc component is carried away by the atmosphere or deposited...
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Options for clean, dry, oil-free compressed air
molecules and the difference between inlet and atmospheric pressures. Inlet air passes through a large bundle of tubular membranes, similar to porous drinking straws. The tube IDs are sized to pass all molecules in the air system. The pores in the sides of the tubes, however, are sized only...
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Best of the Web
that covers basics of float switches, multilevel switches, noncontact level switches, proximity and temperature switches, as well as thermocouple data. FILTERING WITH POROUS METAL. www.appliedporous.com. Applied Porous Technologies develops and makes sintered-porous-metal media, sintered metal...
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CFD Reveals Less Work
a porous media. Instead of modeling flow obstacles such as ground rock, filters, and catalyst beds with the detail necessary to find pressure and velocity gradients, users can model larger-scale parts with specified distributed resistance. This simplifies 3D modeling and reduces model size. For example...
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CFD Reveals Less Work
a finite-element mesh that simulates the behavior of fluid flow along its boundary. In addition to modeling features, today’s CFD software provides tools that let users more easily simulate applications such as: Flow through a porous media. Instead of modeling flow obstacles such as ground rock, filters...
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Making Air Systems Clean & Quiet
of the devices reduces air velocity while baffles for audio damping take care of noise and filtration takes care of the oil. But not just any filter-muffler will work in all cases. A standard filter-muffler has a porous element that traps solids entrained in the compressed-air stream...
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Working in a vacuum
molecules long after vacuum is applied. Leakage is the slow release of captured or clinging gas molecules from minute cracks in the motor laminations, windings, bearings, and metal surfaces. Leakage is a problem when the surfaces of these porous materials are not treated, resulting in unacceptably...
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Carbon Filter Questions and Answers (.pdf)
using a proprietary solid-. release activated carbon into the product water. state extrusion process. The resulting products are highly porous. 3. No release of carbon fines -- Extruded filter elements do not. and extremely uniform, providing high-performance adsorption. release activated carbon...