Recent content by S P

Sophiecentaur, I am not a troll. The task I am solving sounds exactly like that: a possibility to selectively "filter" some frequencies of sound coming from 1 side of the panel (some sort of a board to the other, by drilling holes of the exact diameter and/or length. Of course there is a...

Lets simplify it to single hole. My apologies.

What is wrong in my question?

Nope. This is not sub-woofer building. The precise scenario is the sound filtering panel, which theoretically can be used to "filter" some frequencies more than others. The so called "panel" can be of different shape and different thickness. Sub-woofer or any other bass-reflex type audio...

So, if the sound waves are longitudinal then more or less the amount of sound energy passing is just related to the size of the hole, correct? Still the filter thing is real for really small holes - 200-1000x smaller diameter than sound wave?

Hole is 20mm length and 5mm width. There is an example of subwoofers playing very low notes of massively longer wavelengths through small holes. Your example is of another scenario

Real world scenario: the hole in wall is something you can drill - 5mm diameter R and 20mm length L. Ratio 1 to 4. Hole inside is 100% reflective. Music or pink noise plays on the other side of the wall. Which range from 200Hz to 5kHz will transfer best?

L - the length of the tube. It can be the same of larger than the thickness of the wall. Wall is acoustically a black hole, it absorbs everything. For the simplicity green tube is a hole, which is coated in real world material. I do not think that there will be more than few % of difference...

Hello, First of all, I will try to overcome language barrier as this is not my native language and the more topic is scientific - the more chance for me to get lost in translation. Apologies for poor grammar in advance. I marked it as Advanced post, so apologies if this has to be corrected by...

I calculate like this: 2400 rpm of crankshaft = 40 rotations per second diesel engine displacement is 2 L. Lets assume, that is is not turbocharged. 4 strokes. 40 rps * 2 L * 0.5 (4stroke) = 40 Liters per second on intake I am assuming the worst case scenario, that there are just 40 Liters/s of...

Thank you, Mr Merlin3189, you hit the point! Do you suggest, that I need to split water into tiny droplets to make surface contact area between exhaust gas and water as big as possible, correct? I assume 1 kJ/sec = 1kW, then there is a ballpark of 5-30 kJ/sec from engine depending on its load...

You missed Mason lodge, zombies, Game of Thrones and WORLD DOMINATION!

Apologies for not replying quickly, My primary goals are 2: Primary: to get as much VOLUME of gas state of matter. Water vapor and exhaust gas or mix of those is ok. Secondary: exhaust gases have to be cooled to approx 150C, the lower - the better. In my case the best would be 101 degree...

EXACTLY! I could add to the word "bad" also "cheap" and "already available"

Chemicals do not matter. Exhaust gases are very close to the ambient air, only some toxic substances make it poisonous, but from the physics/thermodynamics point - it is the same. Putting there water will change the ratio of gases as there are already water vapor from hydrogen atoms present in...