Static Electricity

Static Electricity - separated, some of the charges remain...

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Static Electricity Chemical Engineering  311
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Static Electricity n Elusive ignition source n Static charge buildup results from physically  separating a poor conductor from a good  conductor or another poor conductor n Examples: n Walking on carpet, taking off a winter cap n Pumping a nonconductive liquid through a pipe,  pneumatically conveying solids
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Static Charge n With flammable vapors present, any  charge exceeding 0.1 mJ is dangerous. n Walking across carpet – 20 mJ, but  several thousand volts Understand n How charges accumulate n How charges discharge n Resulting energy
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Electricity  Map
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Charge Accumulation n Contact and frictional charge n When two materials, one being an insulator, are  brought into contact, a charge separation occurs  at the interface.  If the two objects are then 
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Unformatted text preview: separated, some of the charges remain separated, giving the two materials opposite but equal charges. n Double-layer charge n Charge separation occurs on a microscopic scale in a liquid at any interface (solid-liquid, gas-liquid, or liquid-liquid). As the liquid flows, it carries a charge and it leaves a charge of opposite sign on the other surface (e.g., pipe wall). Triboelectric Series n Human Hands <---- Most Positive n Rabbit Fur n Glass n Human Hair n Nylon n Wool n Lead n Silk n Aluminum n Paper n Cotton ZERO n Steel n Wood H a r d R u b b e r N i c k e l C o p p e r Electrostatic Voltage Drop Bonding and Grounding Continued Continued...
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Static Electricity - separated, some of the charges remain...

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