I must confess SAE-Australia lost all credibility in my book when the front cover of the magazine featured a ludicrous engine, and the main article inside repeated the inventor's ludicrous claims without an ounce of analysis or skepticism.

Cheers

Greg Locock


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He's mostly just overly pedantic, as I see it. He's nitpicking a convention that has been used in pretty everything, as he attacks Ohm's and Hooke's Laws for the same reason.

https://www.researchgate.net/publication/352111278...

TTFN (ta ta for now)
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IRstuff,

I did not see that.

As a mechie, I hate it when electrical people think they understand mechanical, so I have no sympathy for him if you don't approve of his opinions of Ohm's law. Is heat transfer really a transient condition?

--
JHG

He seem fixated on the difference between the units, or dimensions, and the values associated with them.

I wonder if he can buy fuel for his car since gasoline isn't dollars and therefore dollars per gallon cannot be sensible for him.

"in violation of the modern view that “Dimensions must not be assigned to numbers" "

I figure if he had an example of how to proceed without the traditional method or a firm example of how the traditional method is a failure I'd have sympathy.

"Heat flux cannot be proportional to temperature difference because they are different things, and different things cannot be proportional."

It must be some surprise to him that the number of eyes in a movie audience is usually pretty close to being proportional to the number of people in that audience. Likewise the number of legs in a herd of animals is usually proportional to the number of animals in it. Eyes aren't people and legs aren't animals, yet a proportion exists.

For me the main irritation in units is the cancellation of terms in units as if they are numbers. For example, Young's modulus is often given as a force per area or pressure, which is only true when the words "change in length of item (region?)" and "original length of item (region?)" are cancelled because they both share the word "length."

I have preferred, especially there, the use of something like psi/ppm which also matches a thermal expansion coefficient described as ppm/degree F, though why the thermal expansion coefficient usually retains the delta proportional length and Young's modulus typically does not is its own mystery.

I'm more comfortable with cancellation of units than 3DDave is - provided that the units that are being cancelled are the same. Why should you need to say that length and extension are both measured in inches, since the modulus is the same if both quantities are measured in millimetres (or even in ells).

Where it does matter (and you've kind of picked up on this with the use of psi/ppm) is when the units aren't the same as each other.

A.

Parts per million isn't in inches.

Quote:

Is heat transfer really a transient condition?

Need to define "transient" first. Again, it's a pedantic observation; one could assert that "steady-state" can only be if NOTHING is happening, which would occur in 100 billion years when the entire universe ceases operation and everything is at absolute zero. One can certainly assert that heat transfer is transient because something "flows" because dQ/dt /= 0, but that's only one way to look at it; if dQ/dt = constant, we can recast the differential equations and treat that as a "steady-state" condition, since the flow is "steady state" (constant) and therefore not transient. Typically heat transfer separates the case where dQ/dt = f(x,t) as the "transient" case.

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Adiutori makes some interesting points, and it's a good exercise for everyone else to see if they really understand the subject matter to refute his arguments. And who knows, there may be some points buried in the blather that might be gems. On the other hand, TLDR, right?

Good thing he didn't try to rip the transistor, whose very definition as "transfer resistor" must be a complete anathema to Adiutori. He probably would have the same problem with hydraulic pressure and water flow

I would take pity on Adiutori; maybe he has ASD and all of this mathematical infrastructure is driving his OCD bonkers.

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Quote (3DDave)

Parts per million isn't in inches.

Yes. Not only is ppm not in inches, but you get the same number of ppm whether you measure the quantities you're comparing in inches, parsecs or htwa, so there's nothing to be gained by attaching a unit.

Having said that, if you divide the product of stress and length (in inches) by extension (in inches), then ppm doesn't actually enter into the equation until you arbitrarily multiply the result by a million (perhaps to make the number more tractable).

The ppm does becomes relevant in its own right when you measure length in metres and extension in microns - or any other pair of units that differ by a factor of a million - which is what I thought you were hinting at in your earlier post.

A.

audiatori has been selling "the new heat transfer" since 1975. His methods could be occasionaly used to better understand some arcane phenomena, such as critical heat flux, but the classic methods work OK for most problems.

"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick

Are you sure you're not being played?
Eugene Frank Adiutori looks like an anagram...
I can find the letters for "idiot" and "argue" in there.
Maybe there's a whole silly sentence in there, just thumbing their nose "at the system".

He had ads running in Mechanical Engineering mag for along time some years back, I'd have to think he was serious. I was kind of intrigued by his ideas. Not intrigued enough to buy his book, though:)

Regards

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

Did he design the ship that made the Kessel Run in 12 parsecs?

Sorry, my inner troll made me do it.