Questions tagged [airflow]

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1answer
10 views

Does a venturi cause strain on a pump

Excuse my terminology if it's wrong. I'd like to know if a venturi causes strain on a pump. For example, in my drawing. I have an air pump behind the house with a 50mm pipe fitting. On the other side ...
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2answers
22 views

Pressure and friction force distribution around a blunt body and a streamlined body

How to create a schematic that shows pressure and force distribution around a blunt body (for e.g. a cylinder) and an airfoil? Where can one get the data for these distributions? I looked for these ...
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1answer
21 views

Flow Velocity Data Automation - Platform/Controller Selection

I have been tasked with (semi) automating flow velocity data collection using a pitot tube in a minaturized wind tunnel. The pitot is mounted on a two axis stepper motor system which is controlled by ...
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1answer
23 views

How can I calculate the requirements of a fan to obtain a defined airflow after a HEPA filter?

I would like to understand how can I calculate the requirements of a fan in the following scenario. I want to obtain some airflow (m^3/h or CFM)after a HEPA filter. I have found some specification ...
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0answers
18 views

Hepa 13 Filter Surface Area for Given CFM

How much (area) of HEPA 13 filter should I use for a blower with 160 CFM rating. I am planning to DIY a filter to match my blower's CFM rating. Disclaimer: I'm just a hobbyist with limited education. ...
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1answer
28 views

How to Convert between Air (Dry Air) Normal Liters per Minute (NLPM) and Pounds per Minute (PPM)?

I need to check the leakage of a product, the requirement is basically need to place a flow meter between dry air supply and the product, and apply a pressure of 100, 200, or 400 PSI, and ensure the ...
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1answer
15 views

Influence of bigger air-pumps pulling effect over small pumps

When there are two air-circulation pumps (one powerful than the other) connected in series (as shown in the figure), how would the bigger pump affect the smaller pump? Should the smaller pump be ...
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0answers
28 views

Valve solution for mixing external air into a closed loop climate controlled air circulation system

I'm looking for an electronically controlled air valve solution which would provide a way to mix external air into a closed loop air circulation system used for climate control in an enclosure. The ...
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0answers
20 views

Using venturi effect for equilibrating pressure drop

Let me first say I am a novice in fluid dynamics, I am not sure about terminology but I will try to explain myself as clearly as possible. I need some help for understanding the following case: in a ...
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0answers
34 views

Controlling flow through an output pipe

I wish to limit my flow through the output to a certain exact value. In this case to 10 lpm, what method or valve can I use to this task? At the moment the flow keeps on fluctuating between 10.1-11.2 (...
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1answer
46 views

How to select a fan blade for my application (strong, focused breeze)

My question is how fan blade design relates to the focus of the air leaving the fan. I am looking to generate the most focused breeze I can with a fan blade, excluding additional ducting etc, the fan ...
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1answer
95 views

How to mix pure CO2 with air so that a bioreactor can be fed with air at 0.1% to 10% CO2?

The situation is we have to prepare a gas mix of air and CO2 which has to be given as input from 0.1% to 10% CO2 of air mix to the aqueous medium in a bioreactor? I'm trying to build a simple and ...
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0answers
58 views

What would happen if the air conditioning failed in a skyscraper for an extended period?

I'm writing some fiction which involves the AC in a modern glass curtain skyscraper (50-80 floors?) in an American city failing for a period of weeks, maybe even for up to two months. Could anybody ...
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2answers
59 views

How to visualise/measure airflow in sauna?

I'd like to visualise/measure the flow of air in sauna to optimise the ventilation. Is there a way to colour the air (non-toxic!!!) so I may watch the flow? Or is there any other accessible technology ...
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1answer
62 views

How to transfer air heat easily?

Assume two buildings, one which generates a lot of air heat inside due to electrical equipment running etc. The buildings are 20-25 meters apart. Some questions: How can one easily transfer heater ...
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0answers
45 views

Stokes Number (characteristic length)

I am working with a high speed flow that is non-stokesian, but that isn't the issue. There are correction factors for that. I am attempting to figure out what value to use for the "characteristic ...
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0answers
26 views

Mouth-style whistles, i.e. whistles using flexible materials [closed]

I'm wondering if there is much literature around whistling, i.e. human-mouth style whistling. Either using your lips or your fingers. To make my query less vague: say I wanted to create a rubber ...
2
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2answers
130 views

How to use excel spreadsheet formulas to find optimal camshaft profile [closed]

I have a 600cc 4 cylinder Honda engine that my race car team uses. The rules of the race mandate that we install an intake that is substantially smaller than the stock factory intake size to limit ...
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1answer
287 views

Fan performance curve

I am being asked to compare a fan which is going obsolete with its proposed replacement. From a mechanical and electrical point of view, they are almost completely identical so I have no concerns from ...
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1answer
39 views

Momentary 250 Degree Celsius Air Heating Element

I am a complete novice and need some pointers for designing a heating element that will be installed in an air duct with 60mm diameter, to heat the air passing through it to 250deg C as fast as ...
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10answers
9k views

Why not put servers in a refrigerator?

Recently I was thinking about home improvement, and one idea that is haunting me is that I could use some kind of refrigerator for gaming consoles and laptops. The obvious benefit is that it maintains ...
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1answer
71 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
93 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
54 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
165 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
54 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
126 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
60 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
15 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
51 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
48 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
45 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
25 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
27 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
87 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
32 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
46 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
6k 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
35 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
31 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
94 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
25 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
20 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
38 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
54 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
34 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
61 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
93 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
24 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 ...