Questions tagged [airflow]

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1answer
38 views

How to calculate rock permeability in m^2 from gas flux in m/s?

I am studying rock caverns lined with concrete for compressed air storage. I would like to know if it's possible to convert the permeability coefficient from m/s to m^2 or Darcy. Thank you.
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1answer
31 views

How to have a watertight or airtight pipe seal that is rotating at a radius, with a stationary junction tube?

How would I have a watertight or airtight pipe that is rotating at a radius, if the main reservoir pipe is not? Since I'm pretty sure I didn't do a good job of describing what I mean, the image above ...
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2answers
31 views

Is controlling humidity more precise when calculating with relative or absolute humidity?

I have a tubing system where I need to precisely control relative humidity. All my sensors are giving me temperature [°C] and ...
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1answer
106 views

How do I choose a blower design for an induced draft brick kiln?

I am responsible for a brick kiln in the Punjab province of Pakistan. My government requires all brick kilns to be upgraded to match recent new standards, which include the addition of a blower near ...
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2answers
49 views

Cooling airflow calculation

I want to unplug my refrigerator in the winter, and cool it down by taking air from outside. The idea is to lead cool air from the outside through a pipe into the fridge, then let hot air out of the ...
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2answers
107 views

Why does accuracy of temperature PID controller drop over time and how to eliminate it?

What am I trying to control? I have a container with approximately 3*2*6 meters (width, height, length). I am controlling through PID the ...
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1answer
29 views

Pressure drop in a CFD simulation of an air flow too small

I am simulating a turbulent air flow through a rectangular channel with the goal to match measured velocity profiles and the static pressure at certain points. My problem is that the pressure drop in ...
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4answers
2k views

Benefit of removing the center “engine hub” inside a fan

Most fans (small and large) have inner hubs (see image left). Would there be a gain in efficiency by removing that center hub, thus creating more blade space? You could fix the blades to an outer ring ...
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0answers
13 views

Translations from “Oil” Flow Rate - Pressure drop to “Air” Flow Rate to Pressure Drop charts

I keep getting check-Valve companies that have their product data sheets registered in Pressure Drop-Flow Rate for oil(Hydraulic oil) and I need it for Air. Is there a translation between oil and air ...
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1answer
43 views

Extraction Fan Setup

I have recently bought myself a Flux Beamo laser cutter and am now in the process of setting up fume extraction for it to vent outside. The laser unit has a built in fan of which I haven’t been able ...
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1answer
40 views

Does air flow rate of an air pump imply the same rate when using it to pump water via air pressure?

I want to build a machine that pumps liquids (roughly density of water) out of an enclosed cannister. The cannister has for one inlet for air at the very top and has an outlet (near the top as well) ...
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1answer
23 views

Can air flow occur in both directions in a 2 way solenoid valve?

I'm designing a system where I need to fill and exhaust air from an an air bag. The air will be supplied from a dc motor. As of right now I've been considering placing a 2 way solenoid valve for air ...
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0answers
16 views

Best Fan position for maximum airflow in a Vent

I need to add a simple ventilation duct to my room. The purpose is to draw stale air from the room to the outside. Is it better to place the fan at the intake (position 1) or at the output end (...
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0answers
24 views

Networked Control

Considering the air conditioning system for three rooms B, A, and C. Room A is in the center while rooms B and C are on the left and right sides respectively. What is the coupling value (N) I should ...
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2answers
75 views

Turbulent boundary layer development in channel flow

I'm currently working on my Bachelor's thesis about the numerical simulation of a turbulent air flow through a rectangular channel. As part of that I'd like to compare my results to empirical ...
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1answer
30 views

What is the most efficient way to heat air?

I'm currently playing with a school project. My goal here is to heat a stream of air to a significant temperature so I can demonstrate air expansion. I have a cylinder, with a few turbines, turning in ...
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2answers
28 views

Will coefficient of discharge remain same when it is used for measuring either liquid or gas flow rate?

I would like to measure air flow rate. I have a orificemeter but do not know its coeficient of discharge. Will the Cd remain same for both the liquid and gases or it will be different.?
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1answer
2k views

Converting flow rate from normal/standard liters per minute to cubic meters per second

I'm really confused about these three units commonly used for measuring airflow: cubic meters per second (m3/s) normal liters per minute (NLPM) standard liters per minute (SLPM) I would appreciate ...
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0answers
32 views

Ducted fan thrust in confined space

I would greatly appreciate any insight into this. I'd like to place a ducted fan inside of a box with the bottom cut out. The fan is attached to the sides of the box by support rods. The ducted fan ...
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0answers
22 views

Can you channel more air into a nozzle by creating a vortex inside of it?

There are designs for ducting in wind turbines to channel a wider cross section of wind into the rotor area. This is unpractical for structural and economical reasons but does actually increase power ...
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3answers
67 views

Which way to put two fans for a wood shop air cleaner - paralel or series?

I'm building a small wood shop air cleaner to suck dust floating in the air. I understand a radial blower (squirell cage) is usually used to get some static pressure to overcome the resistance cased ...
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1answer
21 views

How do I increase negative air pressure without inhibiting airflow?

I would like to increase the vacuum power of my desoldering station. It’s a multifunction unit that includes a single vacuum pickup tool, hot air wand and desoldering gun. When using the desoldering ...
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0answers
18 views

CO2 probe measuring at temperatures up to 150 °C

I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (...
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1answer
24 views

Climate control in data centers

I'm a student currently working on a market research project on the HVACR industry, and I'm having trouble nailing down a simple answer to these questions (it may be there are no simple answers, as so ...
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1answer
39 views

Why does higher concentration of electonic components decrease the airflow requirement for cooling a PC system?

This source describes in detail a formula used to calculate the airflow requirement in order to cool a computer system. $$Q = \dfrac{P_{loss}}{c_p \cdot \rho \cdot \Delta T}\cdot k$$ Clearly, the ...
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1answer
29 views

At what efficiency does a fan cool a PC case?

A PC case is basically a rectangular pathaway for air to flow through but at the places where the air enters and exits there are solid plastic or metal panels commonly with meshes and little holes. ...
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1answer
29 views

How does fan airflow relate to its RPM setting?

A fan can run at 600 - 2000 RPM, at 2000 RPM it has 50 m3/h airflow. 0% = 0 RPM 100% = 2000 RPM At 50% = 1000 RPM is the airflow halved to 25 m3/h?
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1answer
53 views

How can I calculate the airflow needed for a fan to cool a system?

The airflow needed for a system to sustain itself at 80°C with 25°C ambient temperature can be calculated with this formula: ...
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1answer
17 views

Best Fan Positions for Airflow in a Duct w/ Two 90° Angles

A similar question was answered here. And while that did help me understand airflow, I have an even more specific question with a little different context. So what I'm dealing with here is pulling ...
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1answer
57 views

What is the amount airflow needed from Aquarium Air pump per minute to make a DIY CPAP?

I am trying to make DIY Bubble CPAP that can put a constant pressure on patient. I am using an Aquarium Oxygen pump as air source. The motor says 38L/Min in the spec. And by googling I found that an ...
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1answer
64 views

How can you maximize air flow through a sound maze in a HVAC transfer grille?

My house has several transfer grilles like this: Except they have no baffles inside them, so light and sound come through into our bedrooms quite easily. I'd like to put in a sound maze like this to ...
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1answer
26 views

Cumulative effect of two axial fans

If I already have a small DC axial 2m3/h fan blowing air at something, what will happen if I add a larger more powerful 6m3/h DC axial fan blowing from behind that one (i.e. its the larger fan first, ...
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1answer
40 views

What are the simplest available methods for monitoring pressure and airflow in a 22mm diameter pipe?

In the emergency case that more than one person must share a mechanical ventilator, the medical professionals lose per-patient monitoring of pressure and airflow. To that end, what are the simplest ...
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0answers
377 views

How does the Xbox Series X “Heat-sink chassis” work?

I understand what a heatsink does, but I cannot wrap my head around how the newly announced Xbox Series X's heat-sink chassis works. From Xbox: Heat-sink chassis A heat sink is a non-electronic, ...
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2answers
97 views

What are these outdoors “mystery boxes” for in the USA?

While watching random videos shot in the USA (in the present time), I've noticed these little weird outdoors boxes: What is the purpose of these? They look like they might be related to ventilation ...
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1answer
22 views

How do cavity resonators differ from tubes of uniform width?

I read that wine bottle produces sound when u blow sideways onto its rim because some frequencies of the white noise produced in your mouth gets amplified when they match the natural frequency of the ...
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3answers
47 views

HVAC Bag Filter Backwash

I need to install a replacement air handler in a facility that has an area where a large volume of particulates are in the air. Unfortunately, the previous designer tried to get away with the ...
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2answers
54 views

How can I build a regulated pressurised air supply?

I need a source of air pressure for an air bearing (3D printed cylinder that expands air upwards like an air hockey table). I would like to be able to control the flow of air. I don't have a lab air ...
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2answers
680 views

What is the equivalent of a capacitor in pneumatics?

I am building a desoldering gun. While the pump I am using provides decent suction, I would like a quick powerful vacuum burst to prevent the solder from solidifying in the nozzle rather than in the ...
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0answers
32 views

Design of fan pipe for propelling glitter

I am trying to create a prototype for a glitter shooting mechanism. It is worth mentioning that I have no experience with mechanical engineering or fluid dynamics. I think the below image describes ...
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1answer
49 views

Does air pressure difference of intake exhaust contribute to jet thrust?

I know momentum of the airflow inside jet engine generates thrust, but what about the pressure difference in front of and at the back of the engine? The air sucking intake at the front has lower than ...
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1answer
36 views

How can I establish as much airflow from my house to outdoors as possible?

I live in a small flat with all doors and windows sealed. The temperature outside is moderately cold. I assume the temperature in my flat is hotter because my body and the computer are emitting ...
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1answer
28 views

How could I automatically agitate water by blowing warm air over its surface?

I want to increase the evaporation rate in a tank by blowing warm air over the surface of the water in the tank; this will (hopefully) agitate the water, increase the airflow in the tank, and maybe ...
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1answer
36 views

Way to digitally measure volume of air inhaled by lungs?

I was interested in this as a fun project. To be able to get the volume of air inhaled by a person has some cool applications I can think of. I was thinking of a modified anemometer of sorts fitted ...
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0answers
57 views

Most efficient turbine for harnessing energy from bidirectional air flow?

I am currently working on designing an oscillating water column as part of a project. In summary: OWC are devices with a semi-submerged chamber or hollow open to the sea below, keeping a trapped ...
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1answer
27 views

Squirrel-cage air blower efficiency

What would be the typical efficiency of a large industrial single-stage squirrel-cage air blower? For example how many kilograms of ambient air (STP) would be moved per second by such blower which ...
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0answers
330 views

Matching Air blower CFM vs HEPA filter CFM, and ΔP in WG, for laminar flow design

I am trying to build a laminar flow box using instructions at these YouTube links for design and build. They recommended getting a Dayton squirrel cage air blower model 1TDU2 rated at 1202 CFM. The ...
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1answer
57 views

Laminar flow hood/air straightener

I was looking at laminar flow filters to aid in my mycology work I'm doing. Most filters use an aluminum extrusion with fins. I figured the options out there are pretty expensive for what you get and ...
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1answer
148 views

How to calculate airflow in m3/min on a gas turbine outlet?

I'm currently trying to figure out the airflow of a gas turbine in m3/min. I thought that i would be able to measure the windspeed over a known cross section on the intakte of the turbine and then ...
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1answer
31 views

What happens in a cone-shaped nozzle?

So I am learning for thermodynamics now and there is one thing that is bugging me. In the book it shows a laval nozzle (very simplified) and a diffuser. with the formulas: (a is the speed of sound) ...