Mechanical Engineering, Fluid Flow and Transfer Processes, Computer Graphics and Computer-Aided Design, Surfaces, Coatings and Films
53
Scopus Publications
1788
Scholar Citations
22
Scholar h-index
32
Scholar i10-index
Scopus Publications
End-of-Life Management of Creosote-Treated Railroad Ties for Energy Recovery in Cement Kiln Installation: A CFD Modelling Approach Grzegorz Borsuk, Jacek Wydrych, Małgorzata Wzorek, Ewa Głodek-Bucyk, Lakhbir Singh Brar Waste and Biomass Valorization, 2026 The study investigates the potential use of creosote-treated railroad ties as an alternative fuel in cement kiln installations. Computational fluid dynamics (CFD) was employed to analyse the behaviour of solid particles and fluid flow within the riser duct of a cement rotary kiln. The simulations were based on the Eulerian–Lagrange two-phase flow approach, allowing for the prediction of solid particle trajectories, fluid flow profiles, and particle residence times. A numerical CFD simulation with a newly developed calculation method has been implemented as the User Defined Functions (UDF). This innovative approach allowed for a comprehensive analysis of phenomena occurring in the riser duct of a cement kiln and determined the optimal particle size range for shredded railroad ties (SRT). The results indicate that particles derived from used railroad ties, within the size range of 1 to 2 mm, comply with the requirements of EU Directive 2010/75/EU, which stipulates a residence time of at least 2 s at temperatures exceeding 850 °C within the riser duct of the cement kiln installation. This study presents an innovative approach to utilizing creosote-treated railroad ties (SRT) as an alternative fuel in cement kiln installations. By employing computational fluid dynamics (CFD) along with a newly developed User Defined Function (UDF), the research introduces an advanced numerical simulation method to analyze the behavior of solid particles in the riser duct of a rotary kiln. Unlike previous studies, which mainly focused on the general application of alternative fuels, this work provides a detailed assessment of particle trajectories, flow dynamics, and residence times, ensuring compliance with EU Directive 2010/75/EU. The obtained results provide valuable insights into optimizing particle size distribution for efficient combustion, contributing to sustainable waste management and increased utilization of alternative fuels in the cement industry.
Comparative evaluation of four-phase interaction models for solid-gas separation and flow dynamics in a square cyclone under high loading conditions Marek Wasilewski, Lakhbir Singh Brar Separation and Purification Technology, 2026 This study presents a comparative evaluation of four interphase coupling models: one-way, two-way, four-way, and four-way with agglomeration - applied to square cyclone separators under high solid-phase loading. The objective was to assess how coupling strategies influence separation efficiency, pressure drop, and internal flow structures under circulating fluidized bed conditions. Simulations employed the Reynolds Stress Model for turbulence closure across a wide range of solid fractions. The results show that the one-way coupling underestimates fine-particle separation and does not capture the effect of solid loading on pressure drop. The two-way coupling improves predictions by including gas–solid feedback but neglects inter-particle dynamics. The four-way coupling further enhances accuracy by accounting for particle collisions, while the agglomeration variant provides the most reliable results. Including agglomeration increases the effective aerodynamic size of fine particles, improves collection, stabilizes pressure drop, and reduces turbulence intensity. Vortex structure analysis confirmed that agglomeration suppresses chaotic instabilities and strengthens flow stability. The findings demonstrate the novelty of applying agglomeration modeling to square cyclones and show that four-way coupling with agglomeration is the most accurate and robust approach for realistic CFD simulations. Beyond methodological advances, the results provide practical guidance for the design and optimization of CFB cyclones and improve understanding of gas–solid flow dynamics in high-load separation systems.
Investigations of the flow phenomena inside square cyclone separators with different prismatic heights Marek Wasilewski, Grzegorz Ligus, Lakhbir Singh Brar Separation and Purification Technology, 2025 • 7 geometric configurations of square cyclones were analyzed. • Variable flow conditions and solid phase properties are considered. • Proper configuration of prismatic heights allows for increased separation efficiency. • In the process of designing square cyclones, it is important to choose PHs for specific operating conditions. This research investigates the impact of various prismatic heights (PHs) on the performance of square cyclones at three Reynolds numbers, viz. Re = 27626, 37,985 and 48345. We have accounted for seven different PHs, viz. 1.0 D , 1.5 D , 2.0 D , 2.5 D , 3.0 D , 3.5 D , and 4.0 D – here, D represents the prismatic section dimension of the square cross-sectional area. Model 2.0 D is the reference model used to evaluate relative performance. A high-performance turbulence model large-eddy simulation has been used to calculate the separation efficiency and pressure drop. The assumptions made in the numerical studies were validated using experimental and PIV studies. Considering the latter, solid particles with three different densities viz. 1100, 2100, and 2800 kg/m 3 are analysed. We also present the flow details in the form of variations in the mean and standard deviation values of scalar and vector quantities. It has been observed that with an increase in the PH, given a Re value, there is a marginal variation in pressure drop values, which amounts to a maximum value of less than 5 % at Re = 48345. Compared to the mild variations in pressure losses, the differences in the collection efficiencies are significant but slightly dramatic (in context to the particle density). A maximum enhancement of more than 26 % has been observed for particle density 1100 kg/m 3 at Re = 48345. Conclusive results indicate that model 4.0 D outperforms all the variants, and this model works more efficiently, particularly for low-density particles. It was shown that in the case of square cyclones, it may also be important to adapt the geometry of the separator not only to the flow conditions of the fluid phase but also to take into account the properties of the solid phase. In this case, the selection of PHs may be crucial.
CFD-based optimization of dynamic cyclones with variable vortex length using GMDH artificial neural network Hamed Safikhani, Somayeh Davoodabadi Farahani, Lakhbir Singh Brar, Faroogh Esmaeili Digital Chemical Engineering, 2025 Dynamic cyclone separators with adjustable vortex length are widely used in industrial applications such as particle collection and air pollution control. However, optimizing their performance remains a challenge due to complex fluid–particle interactions. This research introduces a three-step multi-objective optimization framework for dynamic cyclones with adjustable vortex length. Initially, computational fluid dynamics (CFD) simulations are utilized to examine airflow behavior in different cyclone designs. The Reynolds-averaged Navier-Stokes (RANS) equations, combined with the Reynolds stress turbulence model, are employed to model turbulence. The Eulerian-Lagrangian approach is used to track particle motion, while the Discrete Random Walk technique simulates velocity variations. In the second phase, data obtained from the numerical simulations is used to construct objective function models, focusing on minimizing pressure drop and maximizing collection efficiency. These models are developed using artificial neural networks based on the Group Method of Data Handling (GMDH). The final step involves optimizing the cyclone designs through the non-dominated sorting genetic algorithm (NSGA). The Pareto front is generated and analyzed, offering valuable insights into cyclone design improvements. The findings highlight that an optimized design for dynamic cyclones with variable vortex length can only be achieved through a systematic multi-objective optimization approach.
Effect of Wall, Roof, and Window-to-Wall Ratio on the Cooling and Heating Load of a Building in India Asim Ahmad, Om Prakash, L. S. Brar, Kashif Irshad, S. M. Mozammil Hasnain, Prabhu Paramasivam, Abinet Gosaye Ayanie Energy Science and Engineering, 2025 This study examines the impact of various combinations of walls, roofs, and window‐to‐wall ratios (WWRs) on the cooling and heating loads of residential buildings in India's composite climatic zone. Utilizing EnergyPlus and eQuest simulations, the thermal performance of three building types is analyzed across 32 cases involving two types of walls (W1, W2), roofs (R1, R2), and WWRs of 10%, 20%, 30%, and 40%. The results indicate that Case 29 (W2 R2 N2 WWR1), characterized by a north‐facing orientation, square‐shaped design, and a 10% WWR, achieves the lowest cooling and heating loads among all configurations. Specifically, in Building 1, this configuration reduces cooling loads by 26.0% (from 204 to 151 kBTU/h) and heating loads by 28.6% (from 224 to 160 kBTU/h) compared to the highest load scenario, Case 4 (W1 R1 N1 WWR4, west‐facing orientation, square‐shaped design, and 40% WWR). Similar trends are observed for Buildings 2 and 3. These findings underscore the critical role of optimizing building envelope parameters, particularly orientation, shape, and WWR, in achieving significant energy savings. The insights provided by this study can aid architects, engineers, and policymakers in designing energy‐efficient residential buildings.
Thermal dispersion study of roof and wall materials with chemical pretreatments for energy reduction Om Prakash, Asim Ahmad, Pranav Nayan, Lakhbir Singh Brar, Rajeshwari Chatterjee, Shubham Sharma, Abhinav Kumar, Mohamed Abbas, Sivanraju Rajkumar, Krishnaraj Ramaswamy International Journal of Chemical Reactor Engineering, 2025 This study focuses on reducing heat losses in residential buildings, specifically in the climatic conditions of Ranchi, India. The analysis emphasizes the use of Expanded Polystyrene as an insulating material to address challenges associated with high thermal distribution rates in building envelopes. High thermal distribution in building envelopes and inefficient thermal systems are the primary drivers of increased energy consumption. Thermal distribution of the building envelope contributes to high energy consumption which shield the internal environment from exterior factors such as heating, cooling, humidity, rain, wind, snow, light, noise and air pollution depending on the location. In the month of June, average thermal flows reached 4.9 W/m2 for walls and 18.6 W/m2 for roofs due to higher ambient temperatures and solar irradiance. During winter, heat dispersion was reduced to 2.5 W/m2 for walls and 1.7 W/m2 for roofs, demonstrating the insulating efficiency of Expanded Polystyrene compared to conventional materials. This study demonstrates that Expanded Polystyrene significantly reduces heat losses by 90 % in roofs and 47 % in walls compared to conventional structures without insulation, showcasing its efficiency as an insulating material. Its application in real-world residential buildings can lead to substantial energy savings and improved thermal comfort, making it a practical solution for energy-efficient construction.
Neural network-guided genetic algorithm for multi-objective optimization of fin-and-tube heat exchangers incorporating novel curved winglets R Sharma, DP Mishra, LS Brar Engineering Applications of Artificial Intelligence 165, 113349 , 2026 2026
Analyzing the impact of inclined single and multi-inlet configurations on the turbulent flow field in cyclone separators using large-eddy simulation M Kumar, O Prakash, LS Brar Separation and Purification Technology 376, 134111 , 2025 2025 Citations: 7
Comparative evaluation of four-phase interaction models for solid-gas separation and flow dynamics in a square cyclone under high loading conditions M Wasilewski, LS Brar Separation and Purification Technology, 135945 , 2025 2025 Citations: 2
Analysis and optimization of cyclone separators with bulged conical segments using large-eddy simulation and artificial neural network M Kumar, I Saha, S Pandey, O Prakash, K Elsayed, LS Brar Separation and Purification Technology 370, 133247 , 2025 2025 Citations: 8
End-of-Life Management of Creosote-Treated Railroad Ties for Energy Recovery in Cement Kiln Installation: A CFD Modelling Approach G Borsuk, J Wydrych, M Wzorek, E Głodek-Bucyk, LS Brar Waste and Biomass Valorization, 1-23 , 2025 2025
Data-driven optimization of asymmetric curved winglets in fin-and-tube heat exchangers R Sharma, DP Mishra, LS Brar Swarm and Evolutionary Computation 97, 102056 , 2025 2025 Citations: 1
Investigations of the flow phenomena inside square cyclone separators with different prismatic heights M Wasilewski, G Ligus, LS Brar Separation and Purification Technology 362, 131724 , 2025 2025 Citations: 7
CFD-based optimization of dynamic cyclones with variable vortex length using GMDH artificial neural network H Safikhani, SD Farahani, LS Brar, F Esmaeili Digital Chemical Engineering 15, 100241 , 2025 2025 Citations: 3
Thermal dispersion study of roof and wall materials with chemical pretreatments for energy reduction O Prakash, A Ahmad, P Nayan, LS Brar, R Chatterjee, S Sharma, ... International Journal of Chemical Reactor Engineering 23 (3), 393-404 , 2025 2025
The Preface S Chakraborty, LS Brar, R Maiti JOURNAL OF ENHANCED HEAT TRANSFER 32 (3), V-VI , 2025 2025
Effect of Wall, Roof, and Window‐to‐Wall Ratio on the Cooling and Heating Load of a Building in India A Ahmad, O Prakash, LS Brar, K Irshad, SMM Hasnain, P Paramasivam, ... Energy Science & Engineering , 2025 2025 Citations: 12
Multi-objective optimization of fin and tube heat exchanger with triple inclined straight winglets for performance enhancement R Sharma, DP Mishra, S Chakraborty, O Prakash, LS Brar Journal of Enhanced Heat Transfer 32 (3) , 2025 2025 Citations: 3
Computational and Experimental Analysis of Thermal Oil-Based Parabolic Trough Collector O Prakash, VK Pandey, L Kumar, LS Brar, S Chakraborty, N Kumar, ... Journal of Enhanced Heat Transfer 32 (3) , 2025 2025 Citations: 2
The effect of different subgrid-scale models on the flow field in cyclone separator using large-eddy simulations: A benchmark study D Kumar, V Kumar, K Jha, LS Brar Journal of Physics: Conference Series 2856 (1), 012001 , 2024 2024 Citations: 3
Performance evaluation of cyclone models for similar body diameter and flowrate using CFD M Kumar, O Prakash, S Pandey, SK Singh, LS Brar Journal of Physics: Conference Series 2856 (1), 012003 , 2024 2024
Performance analysis of Plate type Steam Condenser Using Nano-fluid VK Pandey, O Prakash, LS Brar, A Kumar, S Shriwastava, S Chakraborty, ... Journal of Physics: Conference Series 2856 (1), 012006 , 2024 2024
Performance enhancement of a fin and tube heat exchanger with the novel arrangement of curved winglets using a multi-objective optimization approach R Sharma, DP Mishra, LS Brar International Communications in Heat and Mass Transfer 157, 107804 , 2024 2024 Citations: 13
Performance evaluation and development of FE modeling for passive greenhouse solar dryer for potato chips drying L Kumar, O Prakash, A Ahmad, B Das, LS Brar Environmental Progress & Sustainable Energy 43 (4), e14373 , 2024 2024 Citations: 10
Performance evaluation of cyclone separators with elliptical cross-section using large-eddy simulation D Kumar, K Jha, V Kumar, LS Brar Powder Technology 438, 119660 , 2024 2024 Citations: 17
The impact of operating temperatures on the fluctuating flow field and precessing vortex core in cyclone separator using large-eddy simulations LS Brar, F Rahmani Physics of Fluids 36 (3) , 2024 2024 Citations: 8
MOST CITED SCHOLAR PUBLICATIONS
The effect of the cyclone length on the performance of Stairmand high-efficiency cyclone LS Brar, RP Sharma, K Elsayed Powder Technology 286, 668-677 , 2015 2015 Citations: 253
Effect of the inlet duct angle on the performance of cyclone separators M Wasilewski, LS Brar Separation and Purification Technology 213, 19-33 , 2019 2019 Citations: 151
Analysis and optimization of cyclone separators with eccentric vortex finders using large eddy simulation and artificial neural network LS Brar, K Elsayed Separation and Purification Technology 207, 269-283 , 2018 2018 Citations: 145
Analysis and optimization of multi-inlet gas cyclones using large eddy simulation and artificial neural network LS Brar, K Elsayed Powder Technology 311, 465-483 , 2017 2017 Citations: 129
Effect of vortex finder diameter on flow field and collection efficiency of cyclone separators LS Brar, RP Sharma, R Dwivedi Particulate Science and Technology 33 (1), 34-40 , 2015 2015 Citations: 116
Numerical investigations of the flow-field inside cyclone separators with different cylinder-to-cone ratios using large-eddy simulation R Shastri, LS Brar Separation and Purification Technology 249, 117149 , 2020 2020 Citations: 111
Experimental and numerical investigation on the performance of square cyclones with different vortex finder configurations M Wasilewski, LS Brar, G Ligus Separation and Purification Technology 239, 116588 , 2020 2020 Citations: 88
Optimization of the geometry of cyclone separators used in clinker burning process: A case study M Wasilewski, LS Brar Powder Technology 313, 293-302 , 2017 2017 Citations: 66
Effect of the central rod dimensions on the performance of cyclone separators-optimization study M Wasilewski, LS Brar, G Ligus Separation and Purification Technology 274, 119020 , 2021 2021 Citations: 55
On the performance of cyclone separators with different shapes of the conical section using CFD S Pandey, LS Brar Powder Technology 407, 117629 , 2022 2022 Citations: 48
Revealing the details of vortex core precession in cyclones by means of large-eddy simulation LS Brar, JJ Derksen Chemical Engineering Research and Design 159, 339-352 , 2020 2020 Citations: 47
Effect of varying diameter on the performance ofindustrial scale gas cyclone dust separators LS Brar, RP Sharma Materials Today: Proceedings 2 (4-5), 3230-3237 , 2015 2015 Citations: 47
CFD investigations of cyclone separators with different cone heights and shapes S Pandey, I Saha, O Prakash, T Mukherjee, J Iqbal, AK Roy, M Wasilewski, ... Applied Sciences 12 (10), 4904 , 2022 2022 Citations: 45
Multi-objective optimization of cyclone separators using mathematical modelling and large-eddy simulation for a fixed total height condition R Shastri, LS Brar, K Elsayed Separation and Purification Technology 291, 120968 , 2022 2022 Citations: 44
Performance analysis of the cyclone separator with a novel clean air inlet installed on the roof surface M Wasilewski, LS Brar Powder Technology 428, 118849 , 2023 2023 Citations: 32
Investigating the effects of temperature on the performance of novel cyclone separators using large-eddy simulation LS Brar, M Wasilewski Powder Technology 416, 118213 , 2023 2023 Citations: 31
Analysis and optimization of the curved trapezoidal winglet geometry in a compact heat exchanger SK Sarangi, DP Mishra, H Ramachandran, N Anand, V Masih, LS Brar Applied Thermal Engineering 182, 116088 , 2021 2021 Citations: 30
Analysis and optimization of the curved trapezoidal winglet geometry in a high-efficiency compact heat exchanger SK Sarangi, DP Mishra, H Ramachandran, N Anand, V Masih, LS Brar International Journal of Thermal Sciences 164, 106872 , 2021 2021 Citations: 29
Application of response surface methodology to optimize the performance of cyclone separator using mathematical models and CFD simulations LS Brar Materials Today: Proceedings 5 (9), 20426-20436 , 2018 2018 Citations: 29
Performance analysis of cyclone separators with bulged conical segment using large-eddy simulation S Pandey, LS Brar Powder Technology 425, 118584 , 2023 2023 Citations: 28