Recent content by V Mad

Is that not the definition of coefficient, a dimensionless factor? Having said that, there may be different Cd applied to different media as their values are obtained experimentally. I thought that the drag coefficient (as applied to motor vehicle technology) was simply the measured drag...

I don't think that's correct. The coolant mass is a constant, therefore dm/dt is zero. I think coolant flow might be dv/dt where v=coolant volume within the relevant heat exchanger (cylinder block/heads, or radiator). Do you agree?

Interesting point about turbulence. I suppose it locally increases flow rate and therefore improves heat transfer. On cavitation, I never understood this phenomenon. If water cavitates, what is in the cavity and where does it come from?

That formula seems adequate as a basic formula. Presumably this would also apply to the coolant/radiator interface, ie dQ/dt = kA (Tc/Ta) whre Ta is the ambinet air temp. If that is so, I can then build this into an overall system formula. But, to solve my problem about the effect of...

Some interesting anwers here, but I need some time to reflect before commenting. I guess I was expecting some simplified (first order) mathematical models to back up the explanations, although I fear they may be beyond my comprehension. (A quick mention of DaleSpams reply which seems to...

The reason the current reverses is that when you disconnect the battery, and now (presumably*) connect that end of the resistor to ground, the capacitor is now the source of the voltage, and drives current back through the resistor. *If you just open circuit the switch, the circuit will (in...

My first posting, so apologies if this is in any way inappropriate to the forum/section. I am asking here for some scientific input to this question about a cooling system as, for example found in a classical motor vehicle; what is the likely relationship between coolant flow and heat...