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    Van der waals forces

    Are van der waals forces between two molecules stronger in air of in water (as a medium)?
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    Development thermal boundary layer

    Can anyone explain me why the thermal boundary layer develops faster for viscous fluids? I would just say it would develop more slowly because due to high viscosities there are low reynoldsnumbers and thus less turbulence or mixing. This causes a slow homogenization of temperature (assume a...
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    Froude number in vortex formation

    Hi, In a stirred vessels it can occur that a vortex is present which is unwanted because it decreases the mixing. The dimensionless Froude number is a value that can be used to see if the vortex formation is negligible or not. It is defined as Fr=N^2D/g an you can look at it as a ratio of...