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Questions tagged [fluid-filtration]

23 questions
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Why does filter efficiency decrease with thickness?

I understand that the most important parameters for a filter are basically pressure drop and thickness, both of which affect efficiency. However why does thickness cause a change in efficiency? I'm particularly interested in the use of nanofibers as…
User2341
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Gas cleaning in activated carbon filters - How much moisture is needed and why?

Biogas and sewage (typically around 60% CH4, rest CO2) gas is typically treated in activated carbon (ac) filters to remove H2S and siloxanes. The ac filters need a small amount of oxygen (>0,4%) to work. Additionally, the moisture content needs to…
mart
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Membrane permeate prediction software

I wanted to know if there are any open software or even purchasable software available to predict the permeate quality through a nanofiltration module. I am designing a plant for my final year mechanical engineering undergraduate project and need to…
T.Ar
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Filter Area for given flow rate

Background For a washing process after a crystallization we want to know how much filter area we would need and if said area will work for our fixed volume flow. Calculation $\dot{V_F}$ has a given value Velocity $u$ should be the superficial…
idkfa
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How can I separate gear oil from metal shavings to weigh worn metal?

I have tested a gear box for many hours. Where the gears are made of a hardened steel alloy and the housing is 7000 series aluminum. Now I drained the gear box of its gear oil and I need to weight the metal shavings in that oil. So I can put in…
RoboChris
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Does filter surface area affect resistance?

I am in the process of designing the enclosure for a small kiosk like project, and intend on having two fans (Noctua NF-A12x25, chosen for their high runtime rating, quietness, as well as other factors). I want to filter the air to prevent dust…
Anas Malas
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Determing the optimal dimensions for hydrocyclone water/sediment separation

OK, let's be clear: I'm a software engineer (retired), not a physicist, hydrologist, or hydraulics person, so please be gentle. Back Story: In the process of developing an open source system for monitoring water column height in our well and of…
Peter Rowell
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How to filter outside air during wildfire to safe breathable level?

I've had an experience of having outside air heavily polluted by wildfire smoke, and now I'm reading up on the wildfire happening in Southeast Asia. When the air outside got too polluted to breathe, I covered a plain old fan with a wet cloth and…
user1306322
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What material can wick up fluids while not allowing micro-organisms to pass?

I'm looking for a material that can wick up a solution containing nutrients and sugars. The dirty side of the wick should touch a medium to draw up the solution, on the clean side of the wick sterility should be maintained. Do you know of any…
lucas van der zee
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How to pre-process paint residue prior to an RO system?

I am planning to install a reverse osmosis (RO) waste system that will purify waste before putting it into a drain. However there are certain substances like fibrous matter, fats, grease and specifically paint residue that could clog the RO system.…
Wallace Park
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How the 3M Aura 9332+ masks filtrate airborne particles/virus?

The 3M Aura 9332+ mask is labeled FFP3 which means that it filters at least 99% of airborne particles. This article mentions that N95 masks (which filtrate 95% of airborne particles) filtrate the airborne particles with some materials (wool, glass…
MagTun
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Solid-liquid separation of a crystal slurry

Let me preface my question by saying I am a recent chemical engineering graduate and apologize if my inexperience shows. I have designed a batch process which results in a water slurry stream containing an insoluble precipitate (biurea) with…
SimpleJack
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What's the flow resistance of a honeycomb sieve?

Honeycomb sieves are starting to see applications in wastewater screening. What is the flow resistance of a honeycomb screen? I would expect something similar to the Kirschmer formula (used for bar screens): Headloss = constant, dependent on bar…
mart
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Is there a filtration mechanism that allows nicotine molecules to pass and not particulate matter?

I was wondering if an equivalent of the vaporization of tobacco could be achieved by normal combustion but passing the smoke through a filtration mechanism that only allows pure nicotine vapor through while blocking particulate matter associated…
John Smith
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Water flow measuring device for a simple ceramic water filter

I am looking for a solution that would allow me to measure water consumption from a simple ceramic water filter device (see picture below). The meter must be relatively cheap, work without being plugged to the electricity, and be able to to measure…
Caserio
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