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1500 questions
4
votes
3 answers
What metal material to use for stove exhaust pipe?
If biofuel is burnt, for example wood, and the stove I am building is made of metal, what is the most appropriate metal material I should use to avoid excessive corrosion in the exhaust pipe of the stove?
Mohdak
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4
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2 answers
Frequency dependence of electromagnetic shield metal
I know that the effectiveness of metals used for electromagnetic shields heavily depends on the used frequency or frequency range.
I could not find a resource in the web (tables or graphs) that give me the information which material (especially…
Silicomancer
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4
votes
1 answer
Terminology for ponding behind a bridge during a flood
I have read a specific term to describe the process when water pools behind a restriction such as a bridge during a flood. I cannot for the life of me remember what the word was.
The term specifically refers to the process of the ponding of water…
octopi
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4
votes
1 answer
Reinforced Concrete Columns - Interaction Diagram Question
I'm confused about some concepts concerning interaction diagrams for reinforced concrete columns. Hopefully somebody will be able to answer these:
Point with zero tensile strain, but before uniform compression (no moment)
In the calculation for…
Grady F. Mathews Iv
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4
votes
1 answer
Can drawing views in Solidworks be scaled without keeping aspect ratio?
I'm making weldment drawings that involve a long W-Beam with a number of flanges welded to the web. The problem is that because the weldment is so large, lines become difficult distinguish from each other when the weldment is scaled to fit the…
zan
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4
votes
4 answers
Logic gates for an indicator light to show the state of two sensors
I've attempted to answer the following question and I need to know if I am on the right track:
LOGIC GATES
Question 3
A manufacturing plant uses two tanks to store certain liquid chemicals
that are required in a manufacturing process. Each tank…
n0t_a_nUmb3R
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4
votes
1 answer
Calculate thermal flow for air flowing through a tube, with fins
I have the same problem as described in this question:
How to calculate the resulting temperature for a stream of air through a hot tube?, but I want to increase the transferred heat by adding fins onto the inner side of the tube, parallel to the…
arc_lupus
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4
votes
2 answers
"Micro Inverters" vs "Pure Sine Wave" for Solar Systems
Regarding micro inverters for solar power systems:
Is there technically a difference between an inverter classified as a "micro inverter" and and inverter classified as a "pure sine wave" inverter? Or is it simply a matter of using extra jargon to…
Cory
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4
votes
1 answer
What is the exact meaning of "dot product of the pressure and viscous force coefficients on each face with the specified force vector"?
I studied a thesis about a axial turbine and but i didn't understood the bold part of following sentences. What is the exact meaning of "dot product of the pressure and viscous force coefficients on each face with the specified force vector"? This…
user19061
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4
votes
1 answer
How to couple a motor to a screw drive?
I have a simple linear translation stage that is driven by a screw, and I would like to attach a stepper motor to the screw drive. The axis of the screw and the axis of the motor are approximately colinear. The issue is that, as the screw turns it…
Chris Mueller
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4
votes
1 answer
LO/LC, CSO/CSC Valve Definition
Does any one here know of an authoritative source (ASME, ISA, NFPA, OSHA, etc..) that gives a definition for the following in one of their standards or codes and the number for that standard or code:
LO (Valve Locked Open)
LC (valve Locked…
Jrican
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4
votes
1 answer
Inline ducted fan/air turbine blade design to maximize output torque
I've currently got a mechanism that is powered via a shaft connected to a ducted fan. The ducted fan is powered by an existing air flow through the duct. I am looking to re-design the fan to increase torque/performance. The fan will be injection…
GisMofx
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4
votes
1 answer
Carpet for noise reduction (tests / studies)
Sorry if this is the wrong forum, I'm not an engineer but I'd need a pro to answer my question.
Short version:
Are there any tests or studies, if a carpet in an apartement can reduce noise from the apartment below. I'm searching for numbers rather…
MSchmits
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4
votes
1 answer
What is the difference between NIL and hot embossing?
NIL (Nanoimprint lithography) and hot embossing seem to mean the same thing in many instances. Is hot embossing a subset technique of NIL? Or are they completely different methods?
Niko Fohr
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4
votes
1 answer
What are heat sink options for a circulating-water cooling vest?
I am in a first-year engineering design group where we are in the process of designing a cooling vest for motorcyclists for use in the city (1-2h length). Water will circulate through the vest, absorbing body heat, and then that heat will be dumped…
user3471