![]() Water behaves anomalously below about 30 ☌, at low pressures, increasing pressure reduces viscosity instead of increasing it. As the pressure increases, the volumeĭecreases, and the volume of these voids reduces, so usually Viscous flow occurs by molecules moving through the voids ĭecreases with pressure (at temperatures below 33 ☌) Pr ≪ 1 means thermal conduction dominates over thermal convection (heat diffuses faster than matter moves as with liquid mercury), whereas Pr ≫ 1 means that convection is more effective in transferring energy away from an area, compared to conduction as with motor oils. The Prandtl number is a dimensionless number that compares energy convection and conduction. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |