Engineering Stack Exchange
Engineering Stack Exchange

Most Popular

more tags
1500 questions
5
votes
1 answer

How to measure a laser diode's Wavelength

I have some laser diodes. I want to know how to measure the wavelength of laser diodes ranging from visible to near infrared? (300 nm to 1100 nm) What type of instrument/meter do I need to use? spectrometer, spectrophotometer, wavelength meter,…
SARDAR TARIQ
  • 119
  • 2
5
votes
1 answer

How can I connect mismatched solar panels in parallel?

I have two solar panels, a Sanyo HIT 240HDE4 (35.5 V and 6.77 A at max power) and a Panasonic (SANYO) HIT VBHN245SJ25 (44.3 V and 5.54 A at max power). These panels are mismatched in both voltage and current, so aren't ideally suited to being…
Jsom
  • 51
  • 2
5
votes
1 answer

High-resolution Z stage distance measurement

I am designing a 3-stage platform like that of a 3D printer. Three stages correspond to X, Y, and Z axis. There is a nozzle with fixed height about the z-stage platform. The stages are pretty accurate with a resolution of 1 micron. Now I need to…
Jarvis Du
  • 151
  • 1
5
votes
1 answer

How does the pressurized suspension of the Hyperloop not affect the tube pressure?

So one of the proposed suspension systems that will be used on the hyperloop include the externally pressurized air cushions. These cushions lift (or at least help lift) the capsule and reduce drag when the capsule is in motion. Also, the tube…
TheMagicalMachine
  • 61
  • 3
5
votes
2 answers

Bond number for accelerating flow

The Bond number is a dimensionless number typically used to analyze cases where two fluids of different densities are in contact and subject to gravity only. I'm analyzing a system where gas and liquid are entrained in a pipe (think garden hose…
Carlton
  • 3,054
  • 2
  • 12
  • 27
5
votes
2 answers

Pressure drop due to mass loss

How can I "tie" pressure change due to a mass leakage from the flow? In a "closed" system I'd use $pV=nRT$ but this is an "open" system... My open system is an horizontal (no gravity issue) pipe (constant sections) in which flows a gas. We may think…
mattia.b89
  • 335
  • 3
  • 16
5
votes
2 answers

How can I calculate backward extrusion force

I am interested in finding a way to calculate the force necessary to do a backwards extrusion. Typically these would be for forgings 0.5 to 3" in diameter (or square) of different kinds of steel. The diagram below shows a typical type of forging I…
Wallace Park
  • 1,625
  • 2
  • 16
  • 23
5
votes
2 answers

For a small valve in a fluid system, what is the relationship between pressure and flow rate?

The specific example I have in mind is a car tire with a small leak in it. As the pressure increases, does the outflow of air increase linearly, i.e. $v\propto P$, or does it have some more interesting behavior?
Chris Mueller
  • 6,416
  • 2
  • 28
  • 54
5
votes
3 answers

How can I increase the CFM of my ceiling fan?

Since I am unable to change the pitch of the blades on my ceiling fan, I am considering buying a larger one. The current one is certainly efficient enough as that is why I bought it in the first place (CFM/watt); however, I need more airflow. …
Imaginativelywild
  • 71
  • 1
  • 1
  • 4
5
votes
3 answers

What are those large cylinder "tanks" attached to the outside of trucks for?

I've noticed this a few times, the last time today: It's a big cylinder-shaped "tank" (for water?) outside of the front part of the truck. What's the purpose of this thing?
Maiko
  • 59
  • 1
  • 1
  • 2
5
votes
0 answers

Why do some pipelines have regular 90 degree deviations?

On this satellite image, there are pipelines extending from a terminal at sea to an LNG (Liquid Natural Gas) storage facility. Why do the pipelines, at regular intervals, deviated from a straight line? Is it a simple way to prevent / dampen shock…
AJP
  • 151
  • 2
5
votes
2 answers

Can Peltier Modules be practically used to cool a room?

I am thinking of building a indirect Peltier AC to cool a room of approx size 30m3. Single/multiple Peltier modules will be used to cool a insulated box with water inside. The box will be kept outside the room. A pump will circulate the cold water…
Aman Agarwal
  • 53
  • 1
  • 1
  • 5
5
votes
1 answer

Coupling in a twin engine, tandem rotor power train

Consider a transmission for a tandem rotor helicopter with two engines and two main rotors such as the one below. Both engines are connected with sprag (one-way) clutches such that an engine's speed can underrun the rest of the system (e.g. engine…
Mike
  • 51
  • 3
5
votes
1 answer

Calculating Anisotropic Thermal Conductivity for two Materials

I've been working with SC magnet quench simulations. The conductor is made from NbTi in a Cu channel with a 5:1 ratio of Cu:NbTi. Opera3d has a quench program with an example that I began working from. In a quench scenario using a solenoid made from…
Chris
  • 153
  • 5
5
votes
4 answers

Is there a standard name for a flanged threaded tube?

I have designed a custom part that I need, but it is so simple I'm sure there must be off-the-shelf versions available. However I don't know what it's called to search for it. The image on the left is the custom part I designed, it's basically a…
jhabbott
  • 5,970
  • 7
  • 30
  • 63
1 2 3
…
99 100