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Hello all, I have been trying to find the temperature of air after exiting a nozzle from an air compressor. The air in the tank is at 125psig and 25deg C and is exiting to a slight vacuum ~ 13psia. Nozzle exit area is 1/4". Flow rate from the tank is ~0.5cfm. B/c the back pressure is so...

I have been asked to look into a company that produced regenerative fly ash collectors. The company was called Breslove Seperators and was located in Pittsburgh. It appears that this company closed or was purchased by another company. Anyone have any knowledge if their product, or similar, is...

I am not 100% sure this is the right forum, but I'm sure it will do. I went to school as a materials engineer, but my job now is almost entirely mechanical. People often ask what kind of engineer I am, and I have been saying materials, but really all work I do is along the lines of a...

I'm wondering when should lock washers be used? Do they always have to be used with a flat washer? Does it matter what order they go in? As well, in the past I had been using washers on the bolthead side of a connection. On this current project they are stating to always put them on the nut...

I have a question regarding the aerodynamics of an F1 car. Over the past few years one of the more popular debates is what is better, a single or twin keel. What is the keel on an F1 car? I believe the twin keel is supposed to be stiffer but heavier, but I cannot tell by looking at a car if...

I'm looking to get some opinions on a home project idea. We are wondering if it is possibile to measure instantaneous hp on a car. Our current thoughts include using the drag force, mass, and friction to determine the total resistive force on the car. Then using the speed and engine revs...

Hello all,I have a problem that is not related to work in anyway but bothers me for 10 mins every morning. The drain in my shower is corroding quite badly. The house I'm living in is 4, maybe 5 max, and yet the drain is almost in need of a replacement. We are the second occupants of the house...

Hello all, I am still learning my nomenclature for stainless steels, especially castings, but can anyone tell me the difference between ASTM A447 Grade HH-2 and ASTM A297 Grade HH-2? Our current line uses the 297, but on older drawings we have the material labelled as A447, and on some other...

Hello, I have a question about building a home amplifier. I drive a car on its last leg and the stereo was stolen from it.(which didn't work anyways, so i hope someone's really enjoying it). But, I was wondering how difficult it would be to build a simple amplifier so I can hook up my MP3...

I have been looking recently at different grades of ASTM A297. The product is used in application up to 1100 deg. C, and current grade HH is used. I just recently noticed that ASTM A743 CH20 has the same composition as the grade hh, except for the carbon content. I was just wondering what the...

I remember being told in first year of university that Titanium was very difficult to machine. I was told the reason was because of the low thermal conductivity of the titanium caused the heat to be transferred into the cutting tool and therefore limiting the lifetime of the tool. However, I...

This might seem like a simple question, but what is the difference between flame temperature, and adiabatic flame temperature? cheers

First I'd like to just say that this is my favorite forum on the webpage. You can learn a lot by just reading the posts in here. I have question though, currently we are using an astm 297 HH for a high temperature application. I have investigating possible alternatives given relatively the...

I am a materials engineer, my aerodynamic background is limited. I have always wondered why you would want to "trip" the boundary layer on a golf ball to develop turbulent flow and reduce drag, but then race car design encourages laminar flow. Can anyone explain this too me? I started...

Are there any possible alternatives to these zirconia oxygen sensors. We've used them before, and work in many applications but in our nitriding furnace they don't seem to work and I can not figure out why. Max conditions are 600 deg C, 10-3atm. I read a form on eng tips that mentioned...