bbka news- Wide dummies: more heat transfer crimes

[MartinL]

your argument is timeless

thermal conductance = watts per K
thermal capacity = joules per K

or the size of the tank doesnt influence the flow rate out of the tap

Watts and joules are both units of energy, therefore are you claiming that, thermal conductance = thermal capacity, whatever "K" is???
Think you're spouting B0110ck$ there?
OF COURSE THE SIZE OF A TANK IS NOT THE KEY FACTOR DETERMINING THE FLOW RATE OF A LIQUID RELEASED FROM WITHIN IT!
Fluids "flow", heat does not! Thermal mass is a determining factor of temperature retention/loss.

or the size of the tank doesn't influence the flow rate out of the tap?

But water comes out of my small water butt much slower than my big one.

Same depth of liquid in the tank would have been a better way to put it in the post. Flow is a function of pressure for fluids.

Sorry guys, you're talking pressure and liquid flow here not latent heat capacity.

Volume is not necessarily the greatest factor in energy lost either.
On a winters day, open the front door of a small dry lined/ carpeted room and the temperature will quickly fall due to the low thermal mass. However if you did the same to a larger room in a house with solid walls and stone floor the temperature drop will be significantly less, although energy lost would likely be comparable.

 

[user 6228]

Watts and joules are both units of energy, therefore are you claiming that, thermal conductance = thermal capacity, whatever "K" is???
Think you're spouting B0110ck$ there?
OF COURSE THE SIZE OF A TANK IS NOT THE KEY FACTOR DETERMINING THE FLOW RATE OF A LIQUID RELEASED FROM WITHIN IT!
Fluids "flow", heat does not! Thermal mass is a determining factor of temperature retention/loss.




Sorry guys, you're talking pressure and liquid flow here not latent heat capacity.

Volume is not necessarily the greatest factor in energy lost either.
On a winters day, open the front door of a small dry lined/ carpeted room and the temperature will quickly fall due to the low thermal mass. However if you did the same to a larger room in a house with solid walls and stone floor the temperature drop will be significantly less, although energy lost would likely be comparable.

Watts and joules are not both units of energy.
Watts are Joules per Second.
K is the symbol for Kelvins the SI unit of temperature.

heat does "flow" ... in the sense it obeys similar governing equations.
which are similar to those of electrical conduction.

The corresponding analogues are listed below:
Fluid ~ electric ~ thermal
pressure ~ voltage ~ temperature difference
fluid flow ~ current ~ heat flow
viscous resistance ~ electrical resistance ~ thermal resistance
fluid volume in container ~ electrical charge ~ energy
fluid container capacity per unit height ~ capacitance ~ thermal capacitance.

 

[jenkinsbrynmair]

My brain is bleeding now

 

[MartinL]

heat does "flow" ... in the sense .

Yea, yea,

You'll be telling us all electron flow is from positive to negative next!

My brain is bleeding now

It's still Bo110ck5$!

Similarities do not make physics, or for that matter, mathematics!

With available stores to burn, healthy bees will stay warm enough to survive.
Unless that is, some fool subjects them to an environment more suitable to breeding fungal spores & disease!

 

[user 6228]

Yea, yea,

You'll be telling us all electron flow is from positive to negative next!





It's still Bo110ck5$!

Similarities do not make physics, or for that matter, mathematics!

With available stores to burn, healthy bees will stay warm enough to survive.
Unless that is, some fool subjects them to an environment more suitable to breeding fungal spores & disease!

If you havent already I suggest you read a book on heat transfer... "Fundamentals of heat and mass transfer" by Incropera et Al, is quite a good one. Or perhaps "heat transfer" by Pitts et Al. They go into the mathematical detail. In Incropera in section 3.1.2 they make use of "thermal circuit representation" to quantify heat transfer problems, in that case a 1 dimensional conduction problem. In chapter 4 heat flow lines are used in 2 dimensional problems. Further the partial differential equations are there for comparison with fluids and electric fields.