Mixing Performance Research Articles

Multi-objective geometrical optimization of single and dual impeller stirred tanks: An application of the mean age theory approach

Multi-objective optimizations are performed for single and dual-impeller systems. The steady-state mean age theory approach with a novel method developed in previous work is applied for mixing time prediction. The three-blade Pitched-blade turbines are the baseline designs. The study aims to find the optimum impellers with lower mixing time and power consumption than the benchmark designs. The blade consists of two parts characterized by 10 to 12 design parameters, and 120 designs are investigated during optimization. The parameter analysis study highlights that the angle formed by the line connecting the two parts is the most critical parameter affecting mixing performance and power input in both systems. Compared to the baseline design, experimental results show that the optimum designs from single and dual impeller optimization reduce the power consumption 10% and 35%, respectively. However, the reduction in mixing time is not significant. Designs that have lower power numbers with higher power input reduce mixing times by 20%–30%.

Optimization Analysis and Design of Electromagnetic Matching Characteristics of Nano Radar Wave Absorbing Materials Based on Computational Intelligence

Nanometer radar wave absorbent is a new type of absorbent with great development prospect, which has important application demand in radar wave application. However, there are great differences in the practical application effects of different nano-radar wave absorbing materials, so it is necessary to optimize and analyze these differences, and the emergence of computational intelligence technology supplements this work. One of the great advantages of computational intelligence is that it does not rely on the correct model of the system when dealing with performance issues, and is affected by a variety of organisms and biota through algebraic methods. The high-level intelligent system with strong cognitive behavior awareness makes each algorithm have the characteristics of parallelism, social behavior, unit intelligence, openness and so on. Based on computational intelligence, this study analyzes the electromagnetic matching characteristics of nano-radar absorbing materials and concludes that: (1) An absorber cell structure with a tunable interface is designed using the tunable FSS bandpass to replace the previous fixed FSS bandpass. The results show that the transmission rate can be adjusted in a certain range and the input loss is low. Meets the design requirements of a customizable absorber. (2) In order to improve the impact force of nano-absorbing materials, it is necessary to analyze the similarities and differences with others, and process the life information after identification. The improved computational intelligence model can extract and analyze the information efficiently and quickly. (3) Under the same thickness of the design, the single-layer fabric has higher electric wave intensity, but the frequency band is narrower, while the double-layer fabric has higher electric wave input bandwidth. Electrical carbon black can be filled with magnetic nanomaterials to enhance radio wave performance. The composite material has very good electric wave mixing performance, and the polar grinding composite nano material is very suitable for improving the magnetic property and the uniformity of the carbon black particles. (4) For a particular secondary channel, consider using a fast numerical algorithm to optimize the path based on the curvature of the key channel. Proper planning in a robotic approach can not only perform the required tasks efficiently, but also improve performance, reduce workload, and extend the lifetime of the robot.

Predictive Assessment of Climate Change Impact on Water Yield in the Meta River Basin, Colombia: An InVEST Model Application

This paper presents a hydrological assessment of the 113,981 km2 Meta River basin in Colombia using 13 global climate models to predict water yield for 2050 under two CMIP6 scenarios, SSP 4.5 and SSP 8.5. Despite mixed performance across subbasins, the model was notably effective in the upper Meta River subbasin. This study predicts an overall increase in the basin’s annual water yield due to increased precipitation, especially in flatter regions. Under the SSP 4.5, the Meta River basin’s water flow is expected to rise from 5141.6 m3/s to 6397.5 m3/s, and to 6101.5 m3/s under the SSP 8.5 scenario, marking 24% and 19% increases in water yield, respectively. Conversely, the upper Meta River subbasin may experience a slight decrease in water yield, while the upper Casanare River subbasin is predicted to see significant increases. The South Cravo River subbasin, however, is expected to face a considerable decline in water yield, indicating potential water scarcity. This study represents a pioneering large-scale application of the InVEST–AWY model in Colombia using CMIP6 global climate models with an integrated approach to produce predictions of future water yields.

Enhancement of Radiative Power Using a Divergent Splitter Plate Design in H2–Air Non-Premixed Micro-Combustor

Abstract Micro-combustion based power generation devices can be considered as future alternatives to batteries in miniature electronic devices. Micro-combustors operating in non-premixed mode are free from flashback but face the challenge of properly mixing fuel and air within a small volume. In this work, the effect of a divergent fuel–air splitter design on the mixing performance and combustion characteristics of H2–air fueled diffusion micro-combustor is studied. The laminar reacting flow is simulated using the finite volume method and a detailed hydrogen kinetic mechanism. Three divergent splitter designs are compared with the commonly used rectangular splitter to study the effect on radiation power, an essential parameter for thermophotovoltaic power generation. The best-performing divergent and base rectangular splitter designs are investigated in detail. The study shows that the micro-combustor with divergent splitter design reduces mixing distance (Lmix) by 5–23% depending on inlet velocity and channel height. With the divergent splitter, the peak value of the heat release rate also increases slightly, implying enhanced combustion. The divergent splitter increases the high-temperature surface area of the outer wall as compared to the rectangular splitter. This leads to the micro-combustor with divergent splitter producing significantly higher radiation power (>10%) than the rectangular splitter for larger channel heights and higher inlet velocities.

Flexible structures enhance fluid mixing in a channel flow

Early fluid mixing in channel flows without incurring much drop in the pressure head is desired in industrial applications. This study explores wall-mounted flexible plates as obstacles to enhance mixing in channel flows. Using fluid–structure-scalar interaction simulations, we investigate the oscillations of the flexible plates under the flow, which serve as a vortex generator and help increase the mixing. The channel flow involves a scalar field with distinct concentrations initially separated across the channel, gradually intermixing due to vortical structures of varying scales. We have used the “mixing index” and “head loss” metrics along the channel length to assess the mixing quality when plates with different flexibility (characterized by the Cauchy number, Ca) are used. This study introduces a comprehensive criterion, the “coefficient of performance,” derived by comparing mixing and head loss in the presence and absence of obstacles. Aggregating results across various Ca values reveal that flexible plates substantially improve fluid mixing compared to rigid plates. We have also investigated the effect of the pulsatile fluid inlet (quantified by Strouhal number, Stf) and found that lower inlet flow pulsation (Stf<32) adversely impacts mixing performance, recommending a steady inlet flow. However, at high Stf, specifically in the configuration with Ca = 0.06 and Stf = 32, the best mixing performance is achieved in the channel, which marginally outperforms the steady inlet case. The conclusive takeaways from this study are that the plates with increased flexibility result in better mixing, and high inlet pulsation can be employed to fine-tune the mixing performance for further enhancement.

Performance and Lifecycle of Hot Asphalt Mix Modified with Low-Percentage Polystyrene and Polybutadiene Compounds

The paper investigates the improvement of bitumen mixture fatigue resistance and the rutting performance by using a specific low percentage of a styrene–butadiene–styrene (SBS) polymer, which contains polystyrene and polybutadiene compounds. A Fourier transform infrared (IR-FT) spectroscopy of the SBS polymer used in following test was carried out to ascertain the polybutadiene and polystyrene compound ratio, which may affect the modificant properties. Unmodified, low-percentage modified SBS, and common polymer-modified bitumen (PMB) as a reference were tested to ascertain the properties, fatigue resistance, and the rutting performance. The test results of the low-percentage modification with SBS are compared against unmodified mixtures and standard PMB mixtures. Finally, a simulation of the practical application was performed using the HDM-4 software (version 2.0), where the material research findings, with an emphasis on the rutting performance, were translated into the pavement performance with a varying binder course layer under simulated traffic conditions. Lifecycle analysis, with a focus on emissions production (CO2, SO2, and NOx) during pavement operation, was conducted for pavements with unmodified, low-percentage modified SBS, and standard PMB binder courses. The lifecycle analysis showed that a 3% modification of the binder course with the SBS polymer can extend the rutting parameter pavement lifecycle by approximately 34.5%, which is about half of the extension provided by the standard PMB modification. The resulting improvement in the pavement serviceability translated to a 9% reduction in CO2 and SO2 emissions and a 7.2% reduction in NOx emissions over a 20-year period.

Effect of sinusoidal pulsating speed enhancement on the mixing performance of plastics machinery

Abstract Numerous vibration-assisted methods have been adopted to solve problems in polymer processing, but the introduction of vibration fields is typically done on small extruders or injectors in school laboratories and industrial research rooms, which profoundly limits the application of vibration technology. The purpose of this study is to put forward a simple vibration excitation method for all scale extruders or injection molding machines. To recover the mixing performance of that excitation method, a numerical investigation was carried out using the CFD software ANSYS POLYFLOW 19.2, and the analysis and comparison were made between the mixing performance of a simplified screw element with and without a sinusoidal pulsating speed field. The results showed that not all dynamic states with the superimposed excitation field have better mixing performance than the steady state without any pulsating field. Nevertheless, the introduction of a pulsating speed field under certain parameters setting can indeed enhance the stretching rate, reduce the separation scale, increase the mixing efficiency, and lower the screw force. These findings are of great importance and provide valuable references for the development and application of vibration-assisted molding technology in plastics machinery.

Potential Use of Reclaimed Asphalt Pavement Aggregate and Waste Plastic Bottles for Sustainable Asphalt Pavement Production

The main objective of this study was to evaluate the potential use of reclaimed asphalt pavement aggregate (RAPA) and waste plastic bottles (WPBs) for sustainable asphalt pavements production in hot weather conditions. To enhance the adhesion between neat bitumen, RAPA, and WPBs-coated aggregates, a rougher surface texture is created for aggregate particles in the modified asphalt mix. This improvement enhances asphalt mix engineering properties, rutting resistance, and stability. However, bituminous mixtures containing 20% RAPA exhibit tendencies toward strip resistance, this mixture is weak in terms of strength and incapable of supporting loads when utilizing the RAPA. Therefore, due to the moisture susceptibility of the RAPA, it is advised to employ several types of aggregates in future studies to determine the optimal aggregate that can resist stripping and, at the same time, handle heavy loads. Finally, for better asphalt mix performance, it is recommended to use a combination of 70% crushed stone aggregate, 20% RAPA, and 10% WPBs in asphalt mix with a 5.0% optimum modifier content. The experimental results for tensile strength ratio, proportional rut depth, and mean rut depth meet the required specifications of the Ethiopian Road Authority for all properties tested. Therefore, this combination is strongly advised for use in hot mix asphalt production.

Five-DOF nonlinear tribo-dynamic analysis for coupled bearings during start-up

The novelty of this study lies in its investigation of the transient coupling relationship between 5-Degrees-Of-Freedom (5-DOF) nonlinear dynamics and mixed lubrication behaviors of a Coupled Journal and Thrust Water-Lubricated Bearing (CJTWLB) used in rim-driven propeller during start-up. A fully coupled tribo-dynamic model is established, in which 5-DOF nonlinear dynamic behaviors interact with the mixed lubrication performance. The model incorporates nonlinear external excitations, including realistic forces and moments generated by the propeller during start-up. The present numerical model is validated using available experimental and theoretical results from existing literature. Through numerical simulation, the transient nonlinear dynamic and mixed lubrication behaviors of the CJTWLB during start-up are revealed. Results indicate that the evolution of elastic-plastic contact behaviors with acceleration time differs from that of a single journal or thrust bearing. The exciting moments, especially for the moment along the x-axis, and common boundary condition are identified as crucial factors affecting the nonlinear tribo-dynamic performances during start-up in such bearings. Additionally, an interesting finding is that an increase in rotational speed hardly improves the transient mixed lubrication performance of the journal bearing part of the CJTWLB during start-up. Finally, the results demonstrate that a higher blade number is beneficial for improving the stability of the CJTWLB.

Simulation of the three-chamber loop seal in a dual-circulation fluidized bed for coal chemical looping conversion: Mixed particle transport performance

The loop seal (LS) stabilizes the particle circulation in a dual-circulation fluidized bed (DCFB). This study develops a computational particle fluid dynamics model of a three-chamber LS in a DCFB used for coal feeding and oxygen carrier circulation. After investigating the effect of aeration rate on the mixed-particle transport performance of LS, it was found that increasing the aeration rate alters the particle concentration and hence the pressure drop in the horizontal passage between the supply chamber and mixing chamber (MC), exerting a large impact on particle transport in the LS. Class A choking was formed by deposition of large particles at the bottom of the horizontal passage, hindering the particle transport between chambers to some extent. When the aeration rate exceeded the minimum fluidization velocity (umf) by >14 times, bubble coalescence in the MC hindered the axial diffusion of coal particles and accelerated coal loss through the high horizontal passage, also inhibiting mixed-particle transport in the LS. The optimal aeration rate of mixed-particle transport in the three-chamber LS was determined as 14 umf. At aeration rates of 14 umf, the mixed-particle transport performance of the three-chamber LS was effectively strengthened by narrowing the particle-size distribution of coal.

Study on mixing performance of atmospheric entrained flow gasification burner using fine ash as feedstock

A burner structure suitable for atmospheric entrained-flow gasifiers using fine ash as feedstock was proposed. The study investigates the impact of the burner structure on the mixing characteristics through 0.75:1 (geometry reduction) single-phase airflow experiments. Additionally, numerical simulations were conducted to study of the gasification process of fine ash in a 10,000 Nm3/h atmospheric entrained flow gasifier. The results indicate that a larger residual temperature near the burner outlet was observed when the diameter of the burner's gasification agents channel was 10 mm or 15 mm, approximately 0.7–0.8. Additionally, the mixing degree of the two airflows at the burner outlet was high, and the distance required for complete mixing was short. When the diameter of the gasification agent channel was 15 mm, the mixed syngas flow velocity was appropriate. This resulted in a maximum temperature of 2500 °C, an 80 % carbon conversion rate, and an outlet effective syngas (CO + H2) concentration of 62 %.

Getting back in the loop: Does autonomous driving duration affect driver's takeover performance?

The level 3 autonomous driving function allows the driver to perform non-driving-related tasks such as watching movies or reading while the system manages the driving task. However, when a difficult situation arises, the driver is requested to return to the loop of control. This switching from driver to passenger then back to driver may modify the driving paradigm, potentially causing an out-of-the-loop state. We tested the hypothesis of a linear (progressive) impact of various autonomous driving durations: the longer the level 3 autonomous function is used, the poorer the driver's takeover performance. Fifty-two participants were divided into 4 groups, each group being assigned a specific period of autonomous driving (5, 15, 45, or 60 min), followed by a takeover request with a time budget of 8.3 s. Takeover performance was assessed over two successive drives via reaction times and manual driving metrics (trajectories). The initial hypothesis (linearity) was not confirmed: there was a nonlinear relationship between autonomous driving duration and takeover performance, with one duration (15 min) appearing safer overall and mixed performance within groups. Repetition induced a major change in performance during the second drive, indicating rapid adaptation to the situation. The non-driving-related task appears critical in several respects (dynamics, content, driver interest) to proper use of level 3 automation. All this supports previous research prompting reservations about the prospect of car driving becoming like train travel.

Comparative study of flow and heat transfer characteristics of HCF rod bundles in rectangular and triangular arrangement

Helical cruciform fuel (HCF) has high surface-to-volume ratio and excellent mixing performance, which can be used to form the reactor core of the nuclear thermal propulsion (NTP) system. In this research, the flow and heat transfer characteristics of HCF rod bundles in rectangular and triangular arrangement were comparatively studied by numerical simulation method. The flow resistance coefficient and heat transfer coefficient of the bundle were calculated, and the transverse flow rate between the sub-channels were analyzed. The results show that the resistance coefficient of the HCF rod bundle in triangular arrangement is larger. The transverse flow intensity in the sub-channel in triangular arrangement is 27 % larger than that in rectangular arrangement. Moreover, the maximum of JF factor in rectangular arrangement is 1.6 % higher than that in triangular arrangement, and the minimum of JF factor in rectangular arrangement is 11 % lower than that in triangular arrangement.

Unrevealing energy dissipation during iron ore transfer through chutes with different designs

This paper comprehensively analyzes the transportation of iron-bearing solid materials in industrial-scale transfer chute stations by a GPU-DEM model. It considers five chute head designs, including the traditional rock box, impact plate, and hood, as well as the modified micro-boxed alternatives to the impact plate and hood. Particle flow and energy dissipation are analyzed to understand the energy consumption, wall wear, and particle degradation and segregation. The numerical results show that the localizations of different energy dissipation mechanisms significantly differ, resulting in differences in particle degradation and segregation across the chutes considered. The rock box chute is susceptible to the largest degradation and segregation. The micro-box impact plate leads to the least degradation, and the traditional hood causes the best mixing performance. It also shows that segregation becomes more severe as the particle flow stream loses greater energy at the earlier stage of the particle dropping.

Transient simulation of oscillatory gas-liquid Taylor flow and its effects on heat transfer

Microchannel-based gas-liquid Taylor flow has been increasingly used in various cutting-edge applications due to its outstanding flow mixing and heat transfer performance. Previous simulations have been limited to the discussions of flow characteristics under stable flow regimes although several experimental studies have observed the occurrence of fluctuated Taylor bubble tails at relatively higher Reynolds numbers. This study has developed a numerical approach to simulate three-dimensional transient Taylor flow and heat transfer with large bubble tail oscillations. A two-stage modelling procedure combining both fixed and moving frame of reference systems has been adopted to ensure a fully-developed flow is obtained. Simulation results of a water-nitrogen system have been compared with experiments and correlation-predicted results, and good agreements have been achieved. A transient oscillation of the bubble tail has been found to occur as the Reynolds number is greater than 700, approximately, and the fluctuation has been more pronounced as the Reynolds number increases further. The above transient effect has been found to be closely related to the enhanced jet flow which originates from the thin liquid film and later merges into the downstream liquid slug, promoting both small and large-scales flow mixing, enhancing heat transfer up to four times of that for a pure liquid flow.

Optimal design of micromixer for preparation of nanoliposomes

Micromixers are essential components for controlling reactions in microfluidic devices, significantly enhancing their efficiency. This paper introduces an unbalanced separation and recombination micromixer with a circulating chamber and optimizes its geometric structure. The study investigates how the width ratio of the main subchannel and secondary subchannel, as well as the position of the circulating chamber, affect the mixing index and pressure drop at the micromixer's inlet and outlet. The enhanced mixing results from the unbalanced impact generated by the micromixer's separation and recombination, combined with the synergistic effect of fluid self-circulation. Simulation results indicate that the optimized micromixer achieves a mixing index close to 100 % when the Reynolds number exceeds 30, with a pressure drop of only 30 KPa at a Reynolds number of 50 in the micromixer's inlet and outlet. A microfluidic-based micromixer was fabricated using soft lithography and molding techniques. Liposomes were synthesized in a single step using soybean phospholipids, cholesterol, ethanol, and deionized water as raw materials. The micro-mixer exhibited exceptional mixing performance, enabling faster liposome synthesis compared to conventional methods. Additionally, the resulting liposomes exhibited smaller particle sizes and narrower size distributions. By adjusting the flow rates of the organic and water phases entering the micromixer, liposomes with a small particle size of 39 nm and a concentrated particle size distribution (PDI=0.104) were successfully produced. These findings highlight the microfluidic approach as a convenient, rapid, and efficient method for liposome preparation. Furthermore, the unbalanced separation and recombination micromixer with a circulating chamber demonstrated a simple structure, high mixing efficiency, and minimal pressure drop loss. It is versatile and suitable for various microreactor applications.

Performance of cement mortar mixes containing fine reclaimed asphalt pavement aggregates and zinc waste

Cement mortar mixes were prepared to test the suitability of fine reclaimed asphalt pavement (FRAP) aggregates as a replacement for natural fine aggregates (NFA). With different amounts of NFA (25%, 50%, 75% and 100% by weight) replaced with FRAP aggregates, the mechanical qualities of the mortar mix deteriorated. To counteract this, jarosite – a waste from the zinc industry – was used as a partial replacement for cement (replacements of 5%, 10% and 15%). The jarosite improved the microstructural, mechanical and shrinkage properties. For example, compared with the control mix (100% NFA), the mix containing 25% FRAP aggregates showed a 5.5% reduction in hardened density and a 14% reduction in compressive strength. With the addition of 10% jarosite, there was an increase of 4.85% in hardened density and 7% in compressive strength with respect to the mix containing 25% FRAP aggregates. It is thus suggested that 10% jarosite is used when FRAP aggregates are used to make cement mortar mixes. A cost analysis was also performed. The findings of this work are expected to inspire rational mix design recommendations for mortar mixes including FRAP aggregates, as well as bringing environmental and economic benefits by reducing carbon dioxide footprints.

Pure mode I fracture specification of molybdenum disulfide nanoparticles (MDS)-reinforced hot mix asphalt (HMA) under long-term conditions

Low and intermediate temperature cracking are two key factors for fracture and failure of hot mix asphalt (HMA), which impose huge costs on transportation departments and related agencies around the world. These two kinds of cracking may apear in the short- or long-term owing to states such as freezeing-thawing damage (FTD) and the aging mechanism. On the other hand, due to its unique features, nanomaterials are a suitable option for improving the mechanical features of bituminous mixes, which can affect the short-term performance and long-term performance. In this study, low and intermediate temperature fracture specification of Nano-molybdenum disulfide (MDS)-reinforced hot mix asphalt (HMA) under long-term conditions was evaluated. For this goal, two semi-circular bend (SCB) geometries comprising 90 degree and angled cracks, which were called symmetric SCB and classical-reinforced SCB-2, were made. Then, two various conditions, i.e. three freeze–thaw cycles and six days of aging operation were performed on various mixes in order to simulate the long-term performance of the bituminous mixes. Finally, the HMA samples with and without MDS were subjected to the three-point SCB test at the final temperatures of −15 °C and + 15 °C. The findings demonstrated that mixes comprising 0.3 % and 0.6 % MDS had more increased fracture energy (FE), fracture toughness (KIC), and stiffness under pure tension at low and medium temperatures (short-term and long-term fracture specification). In fact, MDS caused an increase in the fracture indices by increasing the maximum force (Pmax) and displacement at the time of fracture. At ± 15 °C and for the geometry comprising the 90 degree and 35 degree cracks, the HMA and Nano MDS-reinforced HMA mixes had more suitable flexibility under 3 FTC compared to 0 FTC; while, the flexibility of the HMA and Nano MDS-reinforced HMA mixes decreased under aging mechanism. In discussing the long-term performance of HMA mixture (with and without modifiers), the findings showed that applying three FTD's cycles to the mixes caused a decrease in KIC, FE, and Pmax. Also, reducing the stiffness of various mixes under 3 FTC, and increasing the flexibility of the mixes were other findings of this study. In addition, the simultaneous use of both SCB geometries comprising 90 degree and 35 degree cracks was proposed to study the fracture specification of bituminous mixes owing to the more inferior average FE and KIC. Finally, the application of 3FTC on bituminous mixes can more suitable simulate the long-term performance of asphalt pavement (compared to aging mechanism).

Research on China’s agricultural product sales transformation: online marketing mix strategy and performance on post pandemic area

At the end of 2019, the sudden outbreak of the pandemic brought a significant impact on the sales of agricultural products in China and all over the world. To reduce the unmarketable problem caused by the pandemic in the agricultural industry, operators who used to focus on offline sales changed their marketing strategy and began to build online sales channels through e-commerce platforms and adopt various online marketing strategies to improve their marketing performance. Furthermore, the performance of online marketing of agricultural products is affected by the interaction of multiple factors in the complex environment. This study aims to distinguish between the performance of different online marketing strategies by using necessary comparative analysis (NCA) and qualitative comparative analysis (QCA) method, to help operators to grasp the critical elements of the online marketing of agricultural products, and how configuration effective impact the online marketing performance. The results show that: (1) NCA’s results show that a single online marketing dimension cannot constitute the necessary conditions for producing high marketing performance of agricultural products, but e-commerce broadcasting, visual effects and government cooperation play an obvious role in improving marketing performance. (2) online marketing performance is influenced by the interaction of various strategies, and no single factor has a significant effect on it. (3) a good online marketing performance configuration path is divided into four, namely “the government cooperation—e-commerce broadcasting” domination; “the government cooperation—visual effects—e-commerce broadcasting” leading; “customer relationship—the government cooperation—visual effects—e-commerce broadcasting” leading; “platform number—visual effects—e-commerce broadcasting” leading. (4) There are four driving paths with no-good online marketing performance, and there is a causal asymmetric relationship of the driving paths with good online marketing performance. This study provides management enlightenment for agricultural operators on how to effectively improve the performance of online marketing, help operators to solve practical problems, and facilitate the development of agricultural e-commerce.

Mixed H∞‐based finite‐time passive filtering for a class of uncertain nonlinear singular systems

AbstractThis article discusses the finite‐time mixed and passive filtering design problem for uncertain nonlinear singular systems. The parameter uncertainties are constrained by well‐defined upper bounds on their magnitudes. The objective is to design a full‐order filter to ensure that the augmented singular system to be finite‐time boundedness(FTB) with and passivity performance. Firstly, a sufficient condition for achieving singular finite‐time boundedness with mixed and passivity performance for uncertain nonlinear singular system is derived by introducing a free matrix. Secondly, a novel criterion is established for analyzing finite‐time and passivity problem of filtering error singular system based on augmented matrix technique. Thirdly, the filtering design conditions are presented and the relevant parameters of the desired filter are determined using linear matrix inequality decoupling principle. Finally, a practical circuit system and a numerical example are provided to demonstrate the feasibility of the proposed scheme.