This is caused by or can cause fan stall, but can also be promoted by the design of the blade or even the path air takes into the fan. Turbulence: Turbulence is unpredictable or chaotic airflow, which usually comes in the form of vortexes. Since the air is low-pressured, there's less resistance for the blades to go through, so they spin faster. Stall usually causes the fan to spin faster than normal as well. Also air that can't leave the fan fast enough without being impeded (restricted exhaust) can cause stall, but to a lesser effect. Stall also indicates that air that cannot accelerate fast enough into a fan, causing it to stall easily (restricted intake). Of course, airflow will separate regardless, but stall is the critical point where the blade generates less pressure/airflow and it harms the performance of the fan. This is similar to what happens to airplanes. Stall: When a fan moves at certain speeds and/or has blade angles that are too aggressive for that speed, it causes the air flowing over the blades to separate, creating vortices and a low-pressure area where the airflow separates. The higher the system effect, the more resistance, and therefore, the more you need to rely on static pressure to allow air to move through the entire system through diffusion. System effect: A name for how much resistance there is in a system. Therefore, it must create a pressure difference to allow air to literally diffuse past the restriction much like how high-pressure air likes to move to a low-pressure area. In high restrictions such as heatsinks and radiators, the fan is usually unable to deflect air with enough velocity to cool a component. The greater the fan's ability to generate this pressure difference, the greater the ability the fan has to move air through restrictions. System impedance is measured in negative static pressure values while fans are positive pressure values. Static Pressure: Usually measured in mm/H2O or in/H2O, this refers to the fan's ability to generate a pressure difference required to overcome system impedance. This determines how quickly a fan can move air to fill up a certain volume unimpeded. It can be represented in metric numbers as well. With a little bit of help, I simplified some of the big ideas down.ĬFM and velocity: Airflow volume in Cubic Feet per Minute. Unfortunately, it's really hard to grasp these concepts. Improving Fan System Performance - A Sourcebook for Industry (PDF)īASF Basic Guidelines For Plastic Conversion of Metal Axial Flow Fans (PDF)Ĭormair Rotron Establishing Cooling Requirements: Airflow vs Pressure (PDF)Ĭormair Rotron: Stall of Axial Flow Fans (PDF)įantech Installation Do's and Don'ts (PDF) Note that many of them come from manufacturers that make industrial cooling solutions: Here are the various resources I found that are related to this topic. so much so that I spent more than a week researching about it and came out rather confused. The fluid dynamics of airflow is an extremely difficult concept to understand. Pick, Assemble and Install: Video Guide.No intentionally harmful, misleading or joke advice.No excessive posting (more than one submission in 24 hours).No selling, trading or requests for valuation.No self-promotion, advertising, begging, or surveys.No submissions about memes, jokes, meta, or hypothetical / dream builds.No titles that are all-caps, clickbait, PSAs, pro-tips or contain emoji.No submissions about retailer or customer service experiences.No submissions about sales, deals or unauthorized giveaways.No submissions about hardware news, rumors, or reviews.Please keep in mind that we are here to help you build a computer, not to build it for you. Submit Build Help/Ready post Submit Troubleshooting post Submit other post New Here? BuildAPC Beginner's Guide Live Chat on Discord Daily Simple Questions threads
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