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Results tagged with flow
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user 243488
The motion of fluids (gases, liquids and granular material).
2
votes
2
answers
570
views
Why is the stress tensor simplifying like this
\begin{eqnarray}
\nabla \cdot \boldsymbol \tau &=& 2 \mu \nabla \cdot \boldsymbol \varepsilon\\
&=& \mu \nabla \cdot \left( \nabla\mathbf{u} + (\nabla\mathbf{u}) ^\mathrm{T} \right)\\
&=& \mu \, \nabl …
- 861
3
votes
Can a fan cause a liquid to cool below room temperature?
Typically a convective boundary condition is of the form $$ Q = h \cdot A \cdot (T(t) - T_\text{env}) = h \cdot A \cdot \Delta T(t) $$ (where h can be a function of fluid velocity if necessary) so it …
- 861
0
votes
Accepted
Thermal diffusity. What do I use?
The relevant equations are (Heat equation)$$ \frac{\partial T}{\partial t} = \alpha\left(\frac{\partial^2T}{\partial x^2}+\frac{\partial^2T}{\partial y^2}+\frac{\partial^2T}{\partial z^2}\right)$$
and …
- 861
1
vote
Is it possible to change only surface tension/viscosity of liquid?
Surfactants can be added to change the surface tension (even in the ppm region). Polymers as well can affect the viscosity and there is a phenomenon known as polymer surfactant interaction that decrea …
- 861