Mesh Aperture Research Articles

Preparation of Durable Polytetrafluoroethylene Superhydrophobic Surfaces by Hot Embossing Technique

ABSTRACTIn this paper, the surface microstructure of screen meshes with different mesh sizes is processed onto the polytetrafluoroethylene (PTFE) surface using a micro‐nano thermal imprinting technique. Simultaneously, silica microspheres are coated on the screen mesh. After hot embossing, these microspheres adhere to the PTFE surface, enhancing its superhydrophobicity and addressing issues such as shallow microstructure, poor abrasion resistance, and reduced hydrophobicity over prolonged use. Through several comparative experiments, the optimal processing conditions, including temperature, pressure, heating time, mesh aperture, and material thickness, were determined by measuring the contact angle and observing the microstructure. The experimental results indicate that the maximum hydrophobic angle of the PTFE surface is 154°, and the addition of silica microspheres significantly improves the superhydrophobicity and weatherability of the PTFE.

A re-optimized design of mesh-type transition zone for large-scale PEM fuel cells considering two-phase flow distribution

The flow distribution in the Flow Field Plate (FFP) has a significant impact on the performance and durability of large-scale Proton Exchange Membrane (PEM) fuel cells. Most of the existing studies focused only on gas-phase flow, while the actual cell operation is gas-liquid two-phase flow. In this study, numerical simulations of single- and two-phase flow distributions are performed for three-dimensional FFPs. The Coefficient of Variation (CV), defined as the ratio between the standard deviation and the mean of the velocities in channels, serves as the indicator of flow uniformity. Firstly, the differences between gas- and two-phase flow distribution characteristics of the FFP with the combined-mesh-type transition zone we previously constructed are elucidated. Secondly, a re-optimized layout with horizontal mesh apertures in the distribution zone and the addition of horizontal mesh in the collection zone is proposed. The design philosophy and methodology based on the coupled flow and resistance regulation mechanism are elucidated. The single- and two-phase CV values are further reduced by 41.25% and 6.05%, respectively. Thirdly the re-optimized structure is applied to different FFP geometries, including smaller development spaces and larger cell areas, where the superior effects on flow distribution are validated.

Species Composition of Fish Larvae and Juveniles in the Nanji Islands, China

To describe the species composition of fish larvae and juveniles in the Nanji Islands, monthly collection was conducted at 12 stations around the Nanji Islands from March 2023 to February 2024 by using horizontal tow at the surface layer. The fish larvae and juveniles were collected by a larva net (1.3 m mouth diameter, 0.5 mm mesh aperture). A total of 6446 fish larvae and juveniles were collected, belonging to 59 species and 54 genera in 11 families. Most of them were preflexion larvae (93.31%). Gobiidae, with eight species, was the most diverse family. Based on the index of relative importance (IRI) result, the dominant species was Sebastiscus marmoratus (Cuvier, 1829), accounting for 84.52% of the total number of samples collected. The common species were Stolephorus commersonii Lacepède, 1803; Omobranchus elegans (Steindachner, 1876); Nibea albiflora (Richardson, 1846); Parablennius yatabei (Jordan & Snyder, 1900); Lateolabrax maculatus (McClelland, 1844); and Odontamblyopus lacepediiand (Temminck & Schlegel, 1845). Other species were all rare species. The highest species number was in September (18 species), and the highest density was in December. Only one fish larva was collected in April. Pielou’s evenness index was highest in November, while Margalef’s richness index and Shannon–Wiener diversity were highest in September. The result of cluster analysis showed that the 11 months (except April) could be divided into four groups. The species number, density, and three diversity indexes showed no significant correlation with temperature and salinity.

Algal Blooms and their Importance in Xochimilco and San Gregorio Atlapulco, Mexico

Algal blooms refer to the massive development of photosynthetic microorganisms in aquatic environments. Microalgae are an important source of food for the primary consumers of these ecosystems, purify water, capture atmospheric CO2 and from them a large number of products for industrial use are obtained; however, in Mexico its study is still incipient, especially with regard to blooms of freshwater species. This paper presents the results obtained from the most abundant and important algal blooms of the Ejidos de Xochimilco and San Gregorio Atlapulco Protected Natural Area. 12 samplings were carried out between the years 2012 to 2022. The samples were collected with 54 μm mesh aperture trawl and van Dorn bottle and were fixed with 4% final formalin and 1% lugol, respectively. 17 algal blooms were recorded, among the Cyanoprokaryotes are: Anabaenopsis circularis, Limnospira maxima, Microcystis aeruginosa, Planktothrix agardhii; among the Chlorophytes Monoraphidium convolutum, Ankistrodesmus falcatus, Closterium acutum, Lemmermannia tetrapedia; among the Euglenophytes Euglena viridis y Phacus pleuronectes and between the Diatoms Cocconeis placentula var. placentula, Stephanocyclus meneghinianus, Epithemia turgida var. turgida, Gomphonema olivaceum, Gomphonema parvulum var. capitata, Hantzschia amphioxys y Craticula cuspidata. Of these species, Limnospira maxima has very high nutritional value, Anabaenopsis circularis, Microcystis aeruginosa y Planktothrix agardhii are potentially toxic or carcinogenic. It should be noted that all the registered species presented great spatiotemporal variations, for the above and given their great importance, it is necessary to expand their knowledge and carry out constant monitoring, as a tool for their understanding, use and management.

Preparation of disc ceramic membrane by a printing and dip-coating method for oil-water separation

Efficient separating oil-water emulsion, it is required that ceramic membranes have the suitable membrane pore size, narrow pore size distribution and low membrane fouling. To realize it, thin and defect-free membrane separation layer should be directly prepared on the large pore size support surface, and the membrane under a dynamic filtration mode. In the present work, disc ceramic membrane without any transition layer was fabricated directly on the surface of support with a pore-size of 3.8 µm via a printing and dip-coating method. The mesh aperture and printing times regulate the thickness of printing layer, preventing the small alumina particles from penetrating into the support. Meanwhile, Dip-coating layer effectively eliminate the defects of the printing layer. Compared with common ceramic membranes, the prepared disc ceramic membrane has a low-cost and high permeability of 1946.6 L/m2·h·bar. Furthermore, the disc ceramic membrane can significantly mitigate membrane fouling and improve the oil-water separation efficiency (>99.5%) under a dynamic membrane filtration mode. This study suggests the practicability of printing and dip-coating method to prepare the disc ceramic membrane with high performance.

Experimental investigation of nano-particle deposited wick Structure's heat transfer characteristics

Recently, nanotechnology attracts more and more attention in heat transfer system. Many studies have shown that using nanofluid as the working fluid can improve the thermal performance of the heat pipe. In this paper, the preliminary effort of applying nano-surface engineering on the heat pipe wick to fabricate the nano-structured wick structure has been carried out. Experimental investigation has been performed to determine the effect of the heat source power, mesh aperture and the wick surface structure on the total thermal resistance of the wick structure. When the heat source power increased from 20 W to 30 W, then to 50 W, the evaporation resistance decreases 25.9% and 13.7% respectively, while the conduction resistance increases 24.8% at first and then decreases 9.5%. The evaporation resistance is less with than without the wick structure, and it increases with the increase of mesh aperture. When the mesh aperture increases from 75 μm to 150 μm, then to 460 μm, the evaporation resistance increases 1.9% and 1.7% respectively. Whereas, the wick structure, as well as the mesh aperture have slight influence on the conduction resistance. The experimental results suggest that the nano structure on the surface can efficiently decrease the evaporation resistance but increase the conduction resistance at the same time. Compared to the wick structure with smooth surface, the evaporation resistance of nano-surface deposited by 0.01% TiO2 and 0.02% TiO2 has decreased 4.3% and 15.5%, respectively. This study provides a reference for the preparation of the heat pipe with greater performance in the future.

Research on Single Point Incremental Forming Characteristics of Perforated TA1 Sheet

In view of its high compactibility, flexibility, reduced compacting pressure, and other superiorities, the single point incremental forming (SPIF) technique has been applied increasingly in the cranial prosthesis forming of perforated TA1 sheet with irregular surface features. Whereas the SPIF of perforated sheet, which seems to meet many challenges in the biomedicine field, where control of component geometric dimensions are qualification requirements of cranial prosthesis. The mechanism of incremental forming and characteristics of perforated TA1 sheet become more complicated because of the mesh apertures. Hence, certain path and forming technique parameters were set to conduct finite element modelling on the truncated right angle cone components of perforated TA1 sheet and titanium plate respectively on the basis of the ANSYS/LS-DYNA platforms, in light of the constructed model, the distribution and variation law of displacement field coupled with the contour accuracy, wall thickness, and strain capacity for different areas of components in the forming process were obtained by researches, bringing up to light the forming mechanism of conical perforated TA1 sheet components. The research findings indicate that the aperture structure of perforated TA1 sheet allows the material elements to accomplish deformation in the surface where the aperture is located, and the strain rate and radial aperture growth rate of perforated titanium sheet are relatively high, the maximum radial aperture growth rate value is as high as 78.53 percent, the maximum circumferential aperture growth rate value is only 10.84 percent, the extension-thinning of forming section for perforated TA1 sheet is higher than that of the titanium plate, and perforated TA1 sheet possesses higher geometric accuracy than titanium plate.

Experimental study on the blocking effect of metal mesh on seepage of molten salt in tank foundation materials

Leakage of molten salt storage tanks in concentrated solar power plants poses a major threat to operating safety. This paper focuses on arranging metal mesh in the storage tank foundation to control the seepage and migration range of molten salt in the thermal-steady foundation materials after leakage occurs. The influences of different conditions, including the metal mesh aperture, metal mesh position, operating temperature, and the mass of leaked molten salt, on the blocking effect were investigated through a custom-built experimental system that modeled the actual leaking process. The results showed that the metal mesh can effectively block seepage of molten salt. When the metal mesh aperture is made smaller or the mesh is placed further toward the bottom of the tank, the metal mesh has a significant blocking effect on molten salt seepage. Especially when the metal mesh aperture is 0.15 mm and the depth of placement is 325 mm, seepage of molten salt can be completely blocked. Nevertheless, it has been found that the depth of molten salt seepage distinctly increases with higher operating temperature or larger leaked molten salt mass. These experimental results will provide references for pollution control and disposition of molten salt leakage accidents and help power plant engineers re-examine tank foundation designs.

Surface-microstructured cellulose films toward sensitive pressure sensors and efficient triboelectric nanogenerators

To achieve environmental sustainability, cellulose-based functional materials have been extensively used in advanced electronic devices, such as pressure sensor and triboelectric nanogenerator (TENG). Here, we fabricate the surface-microstructured cellulose films (M-CFs) by facile regeneration and hot pressing combined with screen mesh templating. Through simple carbonization, the M-CFs are further converted into the surface-microstructured carbonized cellulose films (M-CCFs) with a good conductivity but maintain the original array concave-pits on surface. These constructed microstructures, which are tunable via controlling the screen mesh's aperture, endow the assembled electronics with adjustable and improved working performance. The pressure sensors with M-CCFs as active materials exhibit an enhanced sensitivity in a wide working range and promising potentials for applications in motions detection and healthcare. The TENGs with M-CFs as tribo-positive friction layers demonstrate higher electrical output and an efficient energy harvesting. Our work provides novel insights into the design and construction of cellulose-based functional films for eco-friendly advanced applications.

Efekti metoda prerade na funkcionalna svojstva i mineralni sastav brašna od zrna indijskog oraha

This research determined the effects of processing methods on the functional properties and mineral composition of cashew kernel flour. Three varieties of cashew nut were processed to flour using three methods. The oven-dried, hot oil bathed and roasted cashew nuts were cracked using a wooden mallet to obtain whole cashew kernel. The covering testa was removed by hand and winnowed to obtain whole cashew nuts. The samples were then milled separately using a manually operated attrition mill machine and sieved through a 200 mm aperture mesh screen to obtain flours with uniform particle sizes. The processed samples of flour were taken to the laboratory where functional properties and mineral composition were determined. The result showed that the functional properties of cashew flour processed with a hot oil bath, oven-dried, and roasted varied significantly at (p>0.05). Foaming capacity, emulsification capacity and foaming stability for a hot oil bath, oven-dried and roasted samples respectively were found to be higher in the roasted samples. Water absorption capacity and oil absorption capacity for a hot oil bath, oven-dried and roasted were found to be higher in hot oil bath samples. Swelling capacity and solubility for a hot oil bath, oven-dried and roasted samples respectively, were observed to be higher in oven-dried samples. The mineral composition of cashew flour samples processed using a hot oil bath, oven-dried and roasting were varied significantly at (p>0.05) across the varieties and processing methods. Phosphorus, Ca, Mg, K, Mn, Cu, Zn for hot oil bath, Oven-dried and roasted samples respectively, were significant in hot oil bath samples while Na and iron for hot oil bath, Oven-dried and roasted samples respectively were dominant in oven-dried flour samples. Generally, it was observed that the processing methods adopted significantly influenced mineral and functional properties of cashew kernel flour at (p>0.05). The cashew kernel flour displayed good characteristics of functional and mineral properties. Therefore, flour can serve as a functional ingredient in the formulation of snack products as an alternative to legumes/wheat flour.

QbD approach to downstream processing of spray-dried amorphous solid dispersions – a case study

In the current study, we demonstrate a structured approach to downstream process development for spray dried amorphous solid dispersions. Direct compression is generally not suitable due to typically poor flow of spray dried powders in tablets. Roller compaction (RC) is therefore the method of choice to enable spray dried dispersion downstream processing. Here, a structured experimental design of RC process parameters was used. The objective was to identify process conditions that lead to improved powder flow without compromising tablet robustness. Ten blends were compacted using different process parameters, and subsequently compressed into tablets. The impact of process parameters on granules and tablet properties was analyzed. We demonstrate that compaction force, gap and mesh aperture have major impact on RC outcomes. A combination of large gap and low force was identified as optimum combination of RC process parameters leading to powder flow improvement that could guarantee low tablet weight variation and at the same prevented loss of blend compressibility.

Model of interaction of a rigid mesh with a deformable target

We present an analytical model of the high-velocity impact interaction of a rigid mesh with a semi-infinite deformable target, which is modeled as a rigid-plastic body. We consider the so-called “normal” impact of the mesh on the target: we assume that at the initial moment and subsequent moments of time the mesh is parallel to the target surface while the mesh velocity vector is perpendicular to this surface. The model reproduces the most interesting case in which the mesh aperture is comparable to or less than the diameter of the strings from which the mesh is woven. The aim of the study was to investigate the dependence of the mesh penetration depth on the impact velocity $$V_{0}$$ and on the geometric parameter of the mesh γ that is equal to the ratio of the string diameter to the mesh period. Two versions of the model are considered: with and without taking into accounts the fragmentation of the ejected material of the target. The results obtained on the basis of the proposed model are compared with the numerical solutions which were obtained using the LS-DYNA package. The example of the penetration of a steel mesh into an aluminum-alloy target with impact velocities of 1–3 km/s is analyzed. It is shown that the model that takes into account fragmentation agrees well with the numerical simulations for the mesh parameter interval $$\gamma_{p} < \gamma < 1$$ , in which the lower boundary decreases with increasing impact velocity: $$\gamma_{p}$$ = 0.49, 0.29, 0.2 for $$V_{0}$$ = 1, 2, 3 km/s, respectively.

Flexible ferroelectric wearable devices for medical applications.

SummaryWearable electronics are becoming increasingly important for medical applications as they have revolutionized the way physiological parameters are monitored. Ferroelectric materials show spontaneous polarization below the Curie temperature, which changes with electric field, temperature, and mechanical deformation. Therefore, they have been widely used in sensor and actuator applications. In addition, these materials can be used for conversion of human-body energy into electricity for powering wearable electronics. In this paper, we review the recent advances in flexible ferroelectric materials for wearable human energy harvesting and sensing. To meet the performance requirements for medical applications, the most suitable materials and manufacturing techniques are reviewed. The approaches used to enhance performance and achieve long-term sustainability and multi-functionality by integrating other active sensing mechanisms (e.g. triboelectric and piezoresistive effects) are discussed. Data processing and transmission as well as the contribution of wearable piezoelectric devices in early disease detection and monitoring vital signs are reviewed.

Evaluation of size reduction process for rock aggregates in cone crusher

The size reduction process of rocks in cone crushers is one of the most important issues, particularly for the secondary and tertiary stages of crushing operations. In this study, 17 different rock types were considered for the evaluation of their size reduction variations that occurred in a laboratory-scale cone crusher. Based on several mineralogical, physico-mechanical, and aggregate properties determined for each rock type, the crushability tests were performed. Before and after the crushability tests, particle size distribution (PSD) of the uncrushed (feed) and crushed (product) materials were determined by sieve analyses. On the basis of these PSDs, the degree of rock crushability (DRC) was attempted to quantify by simple approaches (i.e., size reduction ratio, SRR, and the theoretical square mesh aperture size that corresponds to the 10% of the cumulative undersize in the product, P10 (mm)). The crushability test results demonstrated that the DRC in cone crusher could be quantified by focusing on the variations in the SRR and P10. The SRR and P10 are associated with three important rock properties, Shore hardness (SH), Los Angeles abrasion loss (LAA, %), and Brazilian tensile strength (BTS, MPa). The textural and mineralogical features of rocks also have substantial impacts on the DRC for several rock types. It was concluded that the combination of the SRR and P10 could be considered together for the evaluation of DRC in cone crushers. Moreover, further research potentials on the DRC were also discussed in this study.

Diversity of Seagrass-Associated Decapod Crustaceans in a Tropical Reef Lagoon Prior to Large Environmental Changes: A Baseline Study

The community composition of decapods associated with subtidal tropical seagrass meadows was analyzed in a pristine reef lagoon on the Mexican Caribbean coast in the summer of 1995 and winter of 1998. The macrophyte community was dominated by Thalassia testudinum followed by Syringodium filiforme, with interspersed rhyzophytic macroalgae and large patches of drift algae. In each season, 10 one-min trawls were made with an epibenthic sled (mesh aperture 1 mm) during the day and 10 during the night on each of five sites. In all, 53,211 decapods belonging to 119 species were collected. The most diverse taxa were Brachyura and Caridea, but the most abundant were Caridea and Anomura. Dominance was high, with three species (Latreutes fucorum, Cuapetes americanus, and Thor manningi) accounting for almost 50% of individuals, and 10 species accounting for nearly 90% of individuals. There was great similarity in community composition and ecological indices between seasons, but significantly more individuals and species in night versus day samples. In the 20+ years elapsed since the samples were taken, the reef lagoon has undergone substantial environmental changes due to extensive coastal development and, more recently, the decay of massive beachings of floating Sargassum macroalgae. This study constitutes a valuable baseline for future studies investigating the potential impact of these stressors on tropical seagrass-associated communities.

Three-Dimensional Cell Sheet Construction Method with a Polyester Micromesh Sheet.

Cell sheet engineering has become important in a variety of fields, including regenerative medicine and transplantation. Our research group previously developed micromesh cultures that enable cells to form a cell sheet on a microstructured mesh sheet. Here, we present a more usable micromesh culture and devices that make it possible, aiming for widespread use. The devices are mainly constituted of a polyester micromesh sheet and three-dimensional (3D)-printed simple frames that fix the mesh sheet on it. Cells such as fibroblast Tig-1-20 cells, hepatoma HepG2 cells, or mesenchymal stem cells (MSC) were easily seeded on the polyester mesh sheet in the device and cultured for 16 days, which was followed by the formation of a 100-400-μm-thick cell sheet. The cell sheet was very robust, easy to handle, and could be readily removed from the device for subsequent analysis. Optical coherence tomography revealed the structure of the cell sheet as having the mesh sheet layer in the center of the cell sheet. Confocal microscopy demonstrated that Tig-1-20 cells in the cell sheet were aligned according to the shape of the mesh apertures, indicating that cell orientation can be controlled with this micromesh culture. As for another application, the device was used to construct a multilayered cell sheet that consists of three different types of cells. Furthermore, for mass production, the device frames were made using polyoxymethylene (POM) instead of 3D printing materials. Using the POM devices, a large MSC sheet for 10 cm dishes was successfully produced 7 days after cell seeding. This micromesh culture may become one of the useful cell sheet construction methods in future for medical and research fields. Impact statement Currently, cell sheets are constructed, for example, on a temperature-responsive polymer-coated dish or a porous membrane. These cell sheets are widely used but are not completely suitable in terms of robustness, ease of handling, cost, ease of microscopic cell observation, or nutrient supply. We previously reported that the micromesh culture can provide a three-dimensional (3D) cell sheet that has advantages for cell observation and nutrient supply. In this study, the micromesh culture was enhanced with a polyester micromesh sheet and a series of devices of polyoxymethylene, helping us to produce a robust, cost-effective, easily layered, and easy-to-use 3D cell sheet.

Variación espacial de la comunidad de macroinvertebrados acuáticos en la zona litoral del humedal costero Santa Rosa, Lima, Perú

Coastal wetlands are sensitive ecosystems of high productivity because of the ecosystem services that they provide, like water purification, flood reduction, protection of marine coasts. In addition, coastal wetlands are places of great biological diversity. The objective of the present study was to determine the community structure of the benthic macroinvertebrates in relation to the spatial variations in the littoral zone of the Santa Rosa wetland, Lima, Peru. The study was divided into six bimonthly periods from August 2015 to June 2016, we established eight sampling sites: three sites in the main lagoon, two sites in the lagoon arm and two sites in isolated small pools. We carried out the sampling with a hand net of 250μm mesh aperture with 3 replicas for each site. The 8 sites evaluated were environmentally characterized, the physicochemical parameters of the water were recorded for each sampling site and the variations of the water level of the wetland in each sampling campaign were determined through a wooden post with marks in centimeters. We collected a total of 28655 organisms distributed in 76 species. Diptera and Coleoptera were the orders with greatest richness, with 24 and 19 species respectively. The most abundant species were Buenoa sp. (Hemiptera: Notonectidae), Ischnura sp. (Odonata: Coenagrionidae), Chironomus sp. and Goeldichironomus sp. (Diptera: Chironomidae); these four genera represented 62.43% of the total abundance. In the spatial variation, most sites shared the same structure and composition of macroinvertebrates; this was expected because they are connected to the main water body temporarily or permanently, which consequently gives them greater stability and resilience. Only the sites with less depth and extension on the one side and scarce aquatic vegetation and anthropogenic impact on the other side were separated from the general set. Despite the variety of impacts that the wetland suffers, it was observed that the deeper and more vegetated sites are more resilient than the areas exposed to impact and with less water and vegetation. On the other hand, the physicochemical parameters of water at one site (E1) differentiate the community in the absence of impact.

Micro-Patterning of Magnetron Sputtered Titanium Dioxide Coatings and Their Efficiency for Photocatalytic Applications

Titanium dioxide thin films were deposited onto sola-lime glass substrates by reactive magnetron sputtering. Fine stainless steel mesh sheets with different aperture sizes were applied as masks over glass substrates to allow the deposition of the coatings with micro-patterned structures and, therefore, enhanced surface area. Non-patterned titania films were deposited for comparison purposes. The titanium dioxide films were post-deposition annealed at 873 K for crystallinity development and then extensively analysed by a number of analytical techniques, including scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), optical and stylus profilometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis spectroscopy. The photocatalytic activity of non-patterned and micro-patterned titania films was assessed under UV light irradiation by three different methods; namely methylene blue, stearic acid, and oleic acid degradation. The results revealed that the micro-patterned coatings significantly outperformed non-patterned titania in all types of photocatalytic tests, due to their higher values of surface area. Increasing the aperture of the stainless steel mesh resulted in lower photocatalytic activity and lower surface area values, compared to the coatings deposited through a smaller aperture mesh.

Effect of Strengthening Axially Loaded Circular Self-Consolidating Short Columns with Expanded Metal Mesh

Superior confinement for concrete column cannot be provided by traditional lateral ties reinforcement due convergence of bends and twists caused due to lateral reinforcement. In this paper, the enhancement in confining the steel bars due to the utilization of metal mesh any case to the regular tie reinforcement is studied. Totally 5 column specimens were cast and cured. A control specimen was prepared and remaining 4 specimens were internally wrapped using Expanded Metal Mesh (EMM). Mesh Apertures are differed having constant mesh thickness. Self-Consolidating Concrete was adopted in place of congested reinforcement. The specimens were tested under uniaxial compression in universal testing machine until failure. The results show that the strength and ductility has been improved for internally confined concrete column specimens.

Discrete Element Numerical Simulation Method for Permeability Stress Sensitivity of Persistent Fractured Coal Samples

The stress sensitivity of the persistent fracture and primary joint directly affect the stress and permeability of elastic and shear fracture coal samples in fluid–solid coupling simulation. Therefore, the method to select the parameters of the primary joints and persistent fracture affects the accuracy and reliability of the numerical simulation. This paper introduces the discrete element flow coupling simulation program based on the cubic law. The research on the relationship between flow rates and model parameters, including the mesh number, practice length, aperture, model size, and pressure difference, were performed. The fitting formulas of the flow rates and model parameters were obtained by numerical simulation. Based on the experimental study on the stress permeability of the elastic coal sample and the persistent fracture coal sample, the fluid–solid coupling simulation parameters selection method of the initial joint and persistent fracture is presented. The numerical simulation results with the calculation parameters under triaxial equi-compressive and deviatoric loads are in good agreement with the experimental results, indicating that the method herein can well simulate the relationship between the stress and permeability of the coal samples.