What does 50% effective area mean in the technical parameters of filter mesh?

It seems to be the cross-sectional area for fluid flow

The percentage of the mesh area relative to the total grid area. For example, when the mesh count is 10, the grid side length = 1/10 inch = 2.54 mm. The pore size = grid side length – wire diameter = 2.54 – 0.508 = 2.032 mm (this is the particle size that can be intercepted as shown in the table). The effective area (%) = pore area / grid area × 100% = (2.032/2.54)² × 100% = 64.0%

The correct answer is upstairs. I’m not sure though if it’s a problem with the formula’s display; the formula involves dividing two areas together (that is, the ratio of the squares of the side lengths, not **2**).

According to this algorithm, the smaller the effective area of the filter, the smaller the diameter of the particles it can capture; can it be understood that this means a better filtering effect? However, in actual use it may become more prone to clogging, resulting in an increased pressure drop.

That’s the principle; therefore, flushing and trial operation are necessary. During this period, the filter screen can be larger to remove coarse impurities. The filter screen should be checked regularly, and its size should be chosen appropriately – it’s not true that the smaller it is, the better

This post was last edited by filtration.cc on 2021-1-11 at 11:40. Effective area and filtering precision are two different concepts, but there is also a causal relationship among materials with the same technical specifications. In simple terms, the effective filtering area refers to the total area of the filter mesh minus the area occupied by the mesh material itself. Using the parameters shown in the screenshot as an example: if a wire mesh filter has a filtering area of 1 m2 and a filtering precision of 10 mesh, then its actual (effective) filtering area is 0.64 m2; the 0.36 m2 represents the area occupied by the intersecting wire diameters. The effective filtration percentage of the filter media is the most fundamental factor in selecting and manufacturing filters. For example, if a filter needs to be installed in a pipeline with a DN100 diameter, regardless of the material being filtered and factors such as pressure, temperature, and viscosity, to determine the appropriate size of filter, one first considers the cross-sectional area of the pipeline (or the filter inlet); for DN100, this area is approximately 78.5 cm2. If a filtration precision of 10 mesh is chosen, then the surface area of the filter medium must be at least 122.6 cm2 (122.6 × 64%). If a filtration precision of 30 mesh is selected, the surface area of the filter medium must be at least 148 cm2 – in other words, the actual flow area of the filter medium cannot be less than the area of the pipeline or filter inlet ； Due to factors such as the viscosity of the material, solid content, and the frequency at which the cleaning filters need to be replaced, the effective filtering area of the filter elements should be at least 3 times the cross-sectional area of the filter inlet (except in very rare cases involving clean liquids). If filter precision is defined in terms of mesh count, it refers to the maximum porosity per unit area of the material – that is, the maximum number of openings that can be present without wasting material, regardless of whether they are round holes, square holes, or arranged in some other pattern... The definition of mesh count varies from country to country. Just as filters with diameters of 5 mesh and 40 mesh are considered, compared to a 40-mesh filter, a 5-mesh filter has larger pores, fewer of them, resulting in lower filtration precision; however, its effective area is larger (due to fewer filter elements), so the ratio of effective areas varies depending on the filtration precision. There is no pattern to the filtration precision and effective area percentage of filter media made from different materials; examples include wire mesh, perforated mesh, sintered wire fabric filters, and sintered powder filters. When selecting or manufacturing a filter, it is necessary to determine the type of filter media based on the properties of the material, the objectives of the processing, and the way in which the filter will be used, and then choose the appropriate size of equipment based on that filter media type ； Practical experience in filter selection is very important; sometimes the addition of a similar material can cause changes in the overall properties of the material. The filtration area indicated on the filter nameplate is generally the surface area of the filtering material, while the effective filtration area needs to be calculated based on the effective area ratio of different filtering materials

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