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piston/cylinder leak

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Old   September 1, 2004, 04:21
Default piston/cylinder leak
Elsayed M
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moving boundary layers...... A piston moving in a cylinder driven by a motor force the differential pressure between the two piston's surfaces is about 20 mbar my question is about the leak through the piston/cylinder clearance , some experiments shows that the amount of leak is higher when the piston is moving upward compare to the amount of leak when the piston moves downward ………. why????????? Thanks
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Old   September 1, 2004, 11:21
Default Re: piston/cylinder leak
Doctor Blade
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The high pressures produced at the piston surface when it goes upwards surely enhances the loss. When the piston goes downwards a decreasing of pressure is being produced locally at the piston surface. So that, the losses are smaller.

What do you think?
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