Does anyone have a recommendation on a value for the diffusivity coefficient (sq mm/s) of (high density) polyethylene? That datum has been surprisingly difficult to find on the web.
I am a beginner with ProE and have not yet successfully found any guide on how to taper a curved section as shown in the attached sketch. I believe the "extrude" function has an option to flare/taper the geometry, but I have not figured out how to apply that to a curved trajectory. The section...
I wish to modify an existing oil film test rig that tends to pull to one side, preventing the specimen from resting flush on the roller. Please see the attached sketch as a reference. A spring to pull the armature back is the cause of the problem. My proposed solution is to cut the armature...
Seeking guidance on building a simple rig to measure thermal conductivity for insulating materials, I came across a paper which includes the attached figure and equations. This is a modified version of Lee's disk method.
But when analyzing the equations dimensionally, units did not drop out to...
I am experimenting with thermal barrier ceramic coatings and observed that a particular composition consistently adheres to a steel substrate but inconsistently adheres to an aluminum substrate (1 of 3 to 1 of 4). While it appears clear that the difference in the thermal expansion rate between...
After consulting several resources, I am still unclear about the relationship between viscosity and attenuation for Newtonian and non-Newtonian fluids. Stokes Law states that attenuation is proportional to (dynamic) viscosity. That makes intuitive sense for both Newtonian and non-Newtonian...
In another thread there was a discussion about seeking an insulating layer between two metal objects through oxidation. But because oxidation does not lead to a stable equilibrium, the integrity of the substrate is jeopardized.
I am working with a process to apply an iron oxide-based thermal...
I just wish to see if my understanding of the basic chemistry is correct.
The reactants include zirconium oxide (ZrO2) and polyvinyl alcohol (C2H4O) with distilled water as the solvent.
Is it correct to state that polyvinyl alcohol serves as a good binder to zirconium oxide because the...
I am not that experienced using thermocouples (E and K type) and may be overlooking a glaringly obvious fact.
When attaching thermocouples to a National Instruments signal conditioner, I am having difficulty achieving stable temperature readings using a LabView virtual instrument written by a...
I am testing different thermal barrier coatings using a high temperature flame, a thermocouple sealed inside a boss on the specimen's back (not visible in the attached sketch), and a circulating water bath; the test specimen quenches in the water periodically.
The baseline is an uncoated, cast...
I am trying to find an economical way to continuously dispense a 2K urethane. My ideal is using a recirculating valve, but the cost of that valve --- along with a manifold and handle --- is about $1,400 from Nordson (450RC).
Since this is a development program, I am not keen to invest that...
I am reading a negative pressure at the exit side of the orifice flange assembly even though the main reservoir (shown on the left in the attached image) and scavenge sump (not visible to the right)are vented.
Creating a larger vent in the scavenge sump did not affect the magnitude of negative...
Over several months I kept a piece of aluminum coated with polyurethane in a sea salt water solution. Upon inspection I noticed a soft, white substance that formed as clusters at the interface between the polyurethane and aluminum. Attached is an image of the piece; I apologize for the poor...
Considering suction pressure of an oil pump in temperatures below -20F, test data show suction pressures that fall short of the 14.5 psi threshold. But my attempt to model this predicts cavitation because the suction pressure is calculated to be at 14.5 psi.
I am using the equations f =...
I am trying to model the pressure drop across an oil filter past the cracking pressure. Attached is a chart provided by the manufacturer when the cracking pressure is 90 psi. Since I am focused on the steady state pressure drop at a given flow rate, my intent is to isolate the linear portion...
I am seeking a good estimate of the viscosities for straight SAE 30 oil at temperatures slightly below 32 F. The only reference material I have comes from a 1940s engineering handbook, which I used to estimate a best-fit curve. However, I wish to check my result against another source if...
Is the following logic correct to estimate the time required for a metal object in an oven (convection) to be heated up to ambient temperature?
Using the equation (in steady state) P = k* A * T^4, where k is the Stefan-Boltzmann constant, A is the surface area, and T is the ambient temperature...
