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seen May 20 at 1:57

A chemical engineer interested in physics.


Feb
15
awarded  Popular Question
Oct
11
awarded  Nice Question
Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Jun
15
awarded  Popular Question
Apr
23
answered How to calculate fluid's temperature change in a pump?
Dec
1
awarded  Popular Question
Sep
22
comment What makes water boil?
One interesting thing is that due to heat transfer effects, the temperature of the (usually metallic) heat transferring surface has to be somewhat (usually 5 degC depending on surface metallurgy and finish) above the boiling point for boiling to actually start.
Sep
14
accepted In the classic viscosity definition, why does doubling the plate gap cause the force to halve (intuitive)?
Sep
14
accepted What is the molecular model of heat of mixing?
Sep
10
comment In the classic viscosity definition, why does doubling the plate gap cause the force to halve (intuitive)?
The implication of this analogy is that it takes less effort (force) to move a thicker stack of paper than a thinner stack at the same top sheet velocity?!? The bulk system momentum would seem to be the same in both cases since I have twice the mass each "new" piece with half the velocity of the old piece. But my force has decreased per the equation so it would seem I got something (same momentum) for nothing (half the force). Sorry, I can't tell whether this means your analogy fails this thought experiment or my thinking is just wrong (the probable case).
Sep
10
accepted What is an intuitive picture of the motion of nucleons?
Sep
10
asked In the classic viscosity definition, why does doubling the plate gap cause the force to halve (intuitive)?
Sep
5
asked What is an intuitive picture of the motion of nucleons?
Aug
29
comment Pressure change due to fan removing air from a non-airtight room
Wow, I'm just a chemical engineer but statistical mechanics certainly isn't how I would have solved this problem. Where exactly is the fan located? If it is freestanding in the large room then the fan will just recycle the air in circles and the pressure in the room will equilibrate with the outside pressure. If the fan is located in the hole then the equilibrium pressure in the room will depend on the head curve of the fan and will be outside pressure minus the maximum head developed by the fan at zero flow.
Jul
6
awarded  Yearling
May
7
awarded  Commentator
May
7
comment Why is compressible flow near the choke point so efficient?
To clarify slightly: I am interested in why the conversion of enthalpy into kinetic energy becomes more efficient (my definition of efficiency as: less relative entropy production per unit production of kinetic energy) as you approach the choke point (Mach 1 for Fanno flow). Maybe another way of saying it that reinforces @kleingordon post is "What is occurring at the microscopic level in terms of reducing production of disorder when the flow is near the choke point?"
Apr
27
awarded  Critic
Apr
4
revised Why is compressible flow near the choke point so efficient?
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