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Originally posted by jtroutma
A SMALL amount of pressure, YES, but a LOT of pressure, NO.
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Of course
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Our pumps are designed so that if something restricts the line, the impeller will just sit there and thurn water. In other pumps which are designed for high pressure systems, if the exit is blocked, the pump will either: burn out due to extreme stress, or cause an impeller to fracture or pump casing to crack, OR be releaved by a releif valve.
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Because theit "impeller" is mounted on the engine shaft.
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ONLY systems designed for pressure have to worry about these problems. (such as in hydrolic systems)
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Wait... arent our watercooled PCs hydraulic systems ?
Besides we *do* need to take pressure into account. Look at Reynolds equations about laminar flow.
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Head Pressure = NO resistance; how much water can you force up that outlet with nothing attached.
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What ?...
Head Pressure = seal the output and put a manometer. Bingo, positive (and not negligible) pressure...And guess what it''s the very pressure (in water column height - yes its a pressure unit) that written on your pump casing !