Consider a situation where water is used as the coolant in a heat exchanger for a micro-electromechanical device (MEM device). The characteristic velocity is estimated to be 10 microns/s, the length scale of the system is 100 microns, and the characteristic temperature difference of the problem is 10 K. Given what you know about the system, what assumptions can you make about the flow (namely: is it viscous (diffusion)dominated or inertia (convection) dominated, is it conduction dominated or convection dominated, are viscous dissipation effects important, etc.)