Recent content by Chestermiller

Here's a focus problem: I have a spherical shell of low density polyethylene of inner radius 10 cm and outer radius 10.1 cm. The shell is completely full of liquid water at 0 C. I lower the temperature of the shell and water to -1 C. Quantitatively, what is the state of stress of the water...

Yes. Check out the phase diagram for water Phase Diagram of Water Also, the water experiences an increase in volume in the deformed copper tube which results in a lower pressure. This really has to be solved as a coupled problem involving the copper tube and the water.

The container could impose compressive stress on the ice which alters the thermodynamic relationship between ice and water, and can result in volumetric strain.

The volume expansion from water to ice is an intrinsic property of water specifically under the constraint of negligible confining stress. It the ice is subjected to confining stress, the volumetric expansion will be less. Imaging first freezing to ice under no stress and lower tine...

Henry's Law tells us that the concentration of oxygen in the rubber at its outer surface is equal to the partial pressure of oxygen in the air times the Henry's law coefficient: ##C_o=p_oH##, where ##p_o## is 0.21 bar. Similarly, the concentration of oxygen in the rubber at its inner surface...

What are the parameters in your equations, and what criterion are you using for failure?

Counter current heat exchangers, flash vaporizers, cooling towers, heat pumps, refrigeration units, mixing with ice, '''

Have you considered all possible scenarios. I think you should read up on the concept of exergy.

What do you mean by the term "cooling can be generated," and are you saying that this broad statement has no constraints? For example, do you only include just a gas, does this include cycles. Also, cooling of what and by what? How does this relate to cooling of a fluid stream in a heat...

If I understand you correctly, right for an adiabatic process.

Here's a big surprise: The surroundings doing adiabatic compression work on a gas causes its internal energy and temperature to increase. A gas doing adiabatic expansion work on its surrounding causes its internal energy and temperature to decrease. Isn't that what you are saying?

From a fundamental materials point of view, if the metal is isotropic and the sample in not constrained or loaded mechanically (essentially isotropic state of stress) in any way, then the sample experiences a homogenous isotropic strain, with, for small temperature changes, the strain being...

Cooling by expansion can be done with less energy consumption than by what? This seems to me to be basically just a standard reversible adiabatic expansion scenario, analogous to removing pebbles from a cylinder and piston oriented vertically. The increase in the potential energy of the...

Here are my calculations for scenario 1. Given: Initial Temperature = ##T_i=300.2K## Initial Pressure = ##P_i=101325\ Pa## Number of moles n =1.0 Calculations: Initial Volume$$V_i=\frac{nRT_i}{P_i}=\frac{(1)(8.314)(300.2)}{101325}=0.02463\ m^3$$ Final Volume$$V_f=3V_i=0.0739\ m^3$$ Final...

There is no net work done on the piston, and, thus, no net energy "spent by the piston." I show this below. From Newton's 2nd law of. motion applied to the piston, we have $$P_{gas}A+F-P_{atm}A=0\tag{1}$$The term ##P_{gas}A## represents the forward force of the gas on the inside face of the...