Article
Mathematics
Gerasim Vladimirovich Krivovichev
Summary: The paper compares different one-dimensional models of blood flow, taking into account the non-Newtonian property of blood. It analytically solves the simplified nonlinear problem for a semi-infinite vessel with constant properties and compares the solutions for different models. The effects of velocity profile flattening and hematocrit value on deviation from the Newtonian model are investigated.
Article
Mathematical & Computational Biology
Yuqian Mei, Debao Guan, Xinyu Tong, Qian Liu, Mingcheng Hu, Guangxin Chen, Caijuan Li
Summary: This study aims to identify risk factors contributing to cerebral infarction by computational hemodynamics analysis of cerebral artery fenestration. The study found that the flow division condition throughout the fenestration structure has a key impact on further flow redistribution and flow pattern. Blood viscosity has the potential to be a useful tool in identifying the risk factors for cerebral infarction, with emphasis on the hemodynamic environment at superior cerebellar arteries.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2022)
Article
Mechanics
Elif Kayaalp Ata, Ilyas Kandemir
Summary: The steady, laminar, incompressible, axisymmetric stenotic blood flow is investigated using a non-polynomial solution assumption. The wall geometry of the stenosis is modeled as a fixed cosine curve, and the blood rheology is modeled as a generalized power-law fluid. The variations of the coefficients for the velocity profiles are calculated analytically, and the obtained results are validated against Newtonian cases and previous literature. The study concludes that the separation and reattachment points and the existence of the separation-reattachment region are directly related to one of the coefficients in the non-polynomial solution assumption. The Reynolds number to power-law exponent ratio is significant in characterizing the flow streamlines, and a simplified formula for Reynolds number is introduced for blood-like power-law fluids.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Mathematics, Applied
Pinyo Owasit, Somchai Sriyab
Summary: The study examines the impact of various parameters on blood flow through vertically asymmetric stenoses and compares flow quantities. Significant differences in flow behavior are observed between different shapes of stenoses, with combined asymmetric stenoses behaving similarly to single shapes in the first half but slightly differently in the second half.
ADVANCES IN DIFFERENCE EQUATIONS
(2021)
Article
Physiology
Haipeng Liu, Linfang Lan, Jill Abrigo, Hing Lung Ip, Yannie Soo, Dingchang Zheng, Ka Sing Wong, Defeng Wang, Lin Shi, Thomas W. Leung, Xinyi Leng
Summary: The study compared the differences in cerebral hemodynamic metrics between CFD models built with Newtonian and non-Newtonian fluid assumptions in patients with ICAS. It was found that while the rheological difference was not obvious in areas with high WSS in static models, it was enhanced in low WSS areas in transient models.
FRONTIERS IN PHYSIOLOGY
(2021)
Article
Engineering, Chemical
Narges Kamani, Hamid Zeraatgar, Mohammad Javad Ketabdari, Pourya Omidvar
Summary: This study presents a comprehensive continuum approach, INNSPH, for modeling granular surface flows. The method combines incompressible Smoothed Particle Hydrodynamics (SPH) and mu(I) rheology models to simulate non-Newtonian viscoplastic fluid behavior in granular flows. The simulations show good agreement with experimental data, capturing the deposition morphology and run-out distances. The computational efficiency and open-source nature of INNSPH enables large-scale granular flow simulations and facilitates collaboration among researchers. The method provides valuable insights into granular flow dynamics in various industrial applications.
Article
Engineering, Marine
Jiunn-Shyang Chiou, Jing Ling Ng
Summary: This study applies Newtonian and non-Newtonian Bingham models to simulate lateral flow of liquefied soil and investigates the parameters and boundary conditions of the models. It derives analytical solutions and conducts numerical analyses to study the behavior of liquefied soil under different conditions.
Article
Chemistry, Physical
Sumit Kumar Mehta, Bappa Mondal, Sukumar Pati, Promod Kumar Patowari
Summary: This study investigates the mixing and hydrodynamic characteristics of a pure electroosmotic flow of non-Newtonian fluid through a nonuniformly charged micromixer with obstacles arranged in staggered and inline orders. The results show that the rheology of the fluids and the formation of recirculatory zones strongly influence the mixing efficiency. The presence of heterogeneous charged surfaces enhances the mixing, especially for shear-thickening fluids and staggered arrangements of obstacles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Mechanics
Zhike Xu, Chenyang Wang, Sen Xue, Feng He, Pengfei Hao, Xiwen Zhang
Summary: This study developed a model to investigate the mechanism of mechanical hemolysis in Ventricular Assist Devices (VADs) treatment, revealing the different high-strain areas of erythrocytes during stretching and shearing processes, and highlighting the importance of shear rate acceleration in erythrocyte shear damage.
Article
Computer Science, Interdisciplinary Applications
R. F. Dutra, F. S. F. Zinani, L. A. O. Rocha, C. Biserni
Summary: This study focused on the use of Newtonian and non-Newtonian models to represent blood in post-operative scenarios of arterial graft surgeries, and investigated the effects of rheology on flow dynamics and system performance. The results demonstrated that rheological parameters had a significant impact on pressure drop, recirculation zones, and wall shear stress. Rheology played an important role in predicting recirculation zones that were not captured by a Newtonian model.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2021)
Article
Mathematics, Applied
Sergey Ershkov, Dmytro Leshchenko
Summary: In this research, we have revisited the mathematical modeling approach for rivulet flows on inclined surfaces using viscous-plastic theory in Cartesian coordinates. We have obtained a semi-analytical solution for nonstationary creeping approximation of plane-parallel flow. The main motivation of this study is to improve the accuracy of calculations for possible applications in fluid dynamics research in technological or engineering areas. Despite the difficulty in solving the equations of motion for non-Newtonian fluids, we have successfully obtained analytical expressions for velocity components in the directions of motion for slowly moving rivulet flows.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Physics, Fluids & Plasmas
Santiago G. Solazzi, Beatriz Quintal, Klaus Holliger
Summary: This work presents a numerical approach to model the attenuation and modulus dispersion of compressional waves due to squirt flow in porous media saturated by Maxwell-type non-Newtonian fluids. The results show that wave signatures strongly depend on the Deborah number, with larger values leading to increased attenuation and a shift towards higher frequencies.
Article
Materials Science, Characterization & Testing
Shanling Han, Qizhuang Li, Xunhua Sun, He Sun, Shuang Zhang, Yanan Miao, Long Chen, Yong Li
Summary: Micro-bubbles and pores in a tire, caused by the seepage process of rubber, can compromise the tire's safety. Studying the seepage behavior of unvulcanized rubber in a single capillary, the researchers developed a seepage equation to explain the relationship between flow rate, process length, pressure, and pore diameter. The equation was validated and found to be accurate.
Article
Thermodynamics
Hina Sadaf, Iqra Shahzadi
Summary: The paper discusses the simulation of mixed convection flow for physiological transport of Rabinowitsch fluid model, considering the effects of peristaltic flow motion in an inclined tube. Results show that increasing the Biot number decreases the thermal conductivity, leading to a decline in the temperature profile.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Pritam Giri, Indranil Saha Dalal, K. Muralidhar
Summary: Numerical analysis of blood flow infused with magnetic nanoparticles in a W-shaped stenosed human arterial segment was performed using a realistic non-Newtonian blood rheology model. Results showed that the Newtonian model predicted a shorter time to reach steady state compared to the non-Newtonian model. It was also predicted that an increase in nanoparticle concentration would lead to increased drug retention time at the target site. This study provides valuable information for designing computer-assisted drug delivery systems.
Article
Agricultural Engineering
Ahmed M. Salem, Manosh C. Paul
Summary: This paper presents a novel study that investigates the formation and evolution of tar species in biomass gasification using a two-dimensional numerical model. The model is validated using experimental and kinetic data and demonstrates the ability to simulate producer gas production. Benzene, naphthalene, toluene, and phenol are identified as the main tar species, with benzene having the highest concentration.
BIOMASS & BIOENERGY
(2023)
Article
Thermodynamics
Sadia Siddiqa, Sahrish Batool Naqvi, Muhammad Azam, Abdelraheem M. M. Aly, Md. Mamun Molla
Summary: Turbulent convective flow and heat transfer in a cubic cavity is studied using large-eddy simulation and conjugate heat transfer. It is found that turbulent heat transfer significantly alters the flow field, leading to non-uniformity along the vertical direction. Various streaky and coherent turbulent structures are observed near the walls and in the surrounding regions of the cavity.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Amzad Hossain, Preetom Nag, Md Mamun Molla
Summary: This study investigates the numerical simulation of magnetohydrodynamic mixed convection with a non-uniformly heated plate using the GPU-based lattice Boltzmann method. The influence of parameters such as Richardson number, Hartmann number, power-law index, ferroparticles volume fraction, and magnetic field angle on the flow phenomena and entropy generation are studied. The results show the relationship between the influential parameters and the average Nusselt number, as well as the total entropy generation.
Review
Energy & Fuels
Goutam Saha, Ahmed A. Y. Al-Waaly, Manosh C. Paul, Suvash C. Saha
Summary: This study is a systematic review that comprehensively analyzes the heat transfer performance in different kinds of cavities. It investigates the effects of various forces and different types of fluids on heat transfer in cavities. The review also covers validation techniques and mesh types used in numerical studies. The study examines 297 research articles and highlights the significant impact of obstacles and the use of nanofluids on enhancing heat transfer in cavities. Additionally, it suggests future research directions in this field and discusses the implications of the findings in various applications.
Article
Chemistry, Physical
Md Nur Alam Mondal, Nader Karimi, S. David Jackson, Manosh C. Paul
Summary: The premixed combustion of hydrogen/air over a Pt catalyst in a planar channel burner was numerically investigated. The aim was to stabilize the flame at lean to ultra-lean conditions. A species transport model with heterogeneous and homogeneous chemical reaction schemes was used and validated against experimental results. The study found that with the Pt catalyst coated on the walls, complete H2 combustion is achieved within a certain range of equivalence ratios and the contribution of gas phase reactions increases with Reynolds number. The presence of radiation affects combustion kinetics and flame temperature, while NOx emission increases with equivalence ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Mechanical
Sadia Siddiqa, Sahrish Batool Naqvi, Muhammad Azam, Md. Mamun Molla
Summary: This study investigates the wind flow around buildings with different rooftops using large-eddy simulation (LES) numerically. The LES method is used to compute the large eddies and the dynamic Smagorinsky subgrid-scale (SGS) model calculates the small eddies. Artificial turbulent fields are generated at the inlet using the turbulent spot method. The study aims to analyze the wakes' vortical structure of buildings with different heights and shapes. Precise predictions of airflow around buildings are important for various engineering applications to ensure performance and safety. The numerical solver is validated by comparing it with earlier reported numerical and experimental data. The turbulent flow characteristics are discussed in terms of instantaneous flow structure and time-averaged statistical flow quantities. The simulated cases have a Reynolds number Re = 12,000 to understand the turbulent airflow patterns. The flow exhibits a separable bubble at the leading edge of the building's rooftop, resulting in recirculation at the lee side of the first row of buildings. Suction occurs near the leading edge of the building due to this recirculation, ensuring a continuous flow of air around the obstacles. Additionally, Reynolds stresses show high momentum fluxes in the frontal region of the buildings.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Md. Mahadul Islam, Md Farhad Hasan, Md. Mamun Molla
Summary: The objective of this study is to numerically analyse the natural convection of magnetohydrodynamic (MHD) ferrofluid along a vertical thin cylinder with temperature-dependent viscosity. The numerical results discussed the velocity and temperature distribution, local skin friction coefficient, local Nusselt number, streamlines, and isotherms. The findings suggest that the inclusion of magnetic parameter weakens the convective flow due to the presence of both electric field and magnetic field, and the impact on temperature depends on the boundary layer of the thin cylinder.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Oguzhan Kazaz, Nader Karimi, Shanmugam Kumar, Gioia Falcone, Manosh C. Paul
Summary: This study numerically investigates the photo-thermal conversion performance of volumetrically heated solar collector using mono-nanoparticle and hybrid-nanoparticle filled fluids. The thermal capacity of the collector is evaluated by analyzing the scattering and absorption characteristics of the heat transfer fluid in the translucent medium. The results show that the use of nanoparticles and the increase in volume concentration improve the solar energy absorption capacity and the photo-thermal conversion performance. Hybrid nanofluids, with blended nanoparticles, enhance the thermal performance of the collector and the sensible energy storage capacity, making them effective heat transfer fluids for solar energy applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Bader Alqahtani, Jin Yang, Manosh C. Paul
Summary: Worldwide, overdependence on conventional power plants for electricity generation is a significant economic and environmental challenge. Renewable energy sources are seen as the most viable solution. This study proposes a robust approach to establish the ideal pipe design for a hybrid renewable energy system, resulting in improvements in renewable energy fraction and loss indicators.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Amzad Hossain, Md. Mamun Molla
Summary: This study focuses on the numerical simulation of magnetohydrodynamic mixed convection and entropy formation in a wavy enclosure filled with non-Newtonian power-law ferrofluid. The results show that the mean Nusselt number increases with a decrease in the Hartmann number and an increase in the Reynolds number, power-law index, and ferroparticle volume fraction. The total entropy production is reduced by raising the Hartmann number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Physics, Multidisciplinary
Meratun Junnut Anee, Sadia Siddiqa, Md Farhad Hasan, Md Mamun Molla
Summary: Researchers have found that nanofluids are an effective alternative to improve heat transfer efficiency and heat exchange devices, but further investigation is needed to understand the effects of specifications and parameters. This study aims to analyze the impact of magnetic field-dependent viscosity on the natural convection heat transfer of C2H6O2-Al2O3 nanofluid. The results showed that the average Nusselt number increased significantly with higher Rayleigh numbers, but decreased with higher Hartmann numbers.
Article
Engineering, Multidisciplinary
Shayekh Ahmed, Amzad Hossain, Md. Zahangir Hossain, Md. Mamun Molla
Summary: A numerical study on the forced convection of water-Cu power-law non-Newtonian nanofluid in a wavy channel has been conducted. The study shows that heat transfer in wavy channels can be enhanced by adding nanoparticles and increasing the Reynolds number. It is also observed that shear-thinning non-Newtonian nanofluids can be more effective in heat transfer enhancement than shear-thickening fluids.
RESULTS IN ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Nur E. Jannat Asha, Md. Mamun Molla
Summary: This paper focuses on the natural convection of heat transfer using magnetohydrodynamic (MHD) Bingham nanofluid. Utilizing the multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) within a C-shaped enclosure, numerical simulations are conducted to investigate the heat transfer performance. Various parameters including Bingham number, Rayleigh number, Hartmann number, and nanoparticle volume fraction are considered. The results reveal the effects of these parameters on the heat transfer rate along different walls of the cavity, and response surface methodology is employed for further analysis. The study highlights the potential application of the C-shaped geometry in heat exchanging and electronic cooling equipment.
Article
Thermodynamics
Junxi Jia, Manosh C. Paul
Summary: A combined cooling, heating and power system based on biomass gasification is proposed. The system evaluates the energy and exergy efficiencies and economic performance under different working conditions. The inclusion of a Stirling engine and the recycling of weak solution contribute to improved power output and efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Physics, Multidisciplinary
Amzad Hossain, Meratun Junnut Anee, Sharaban Thohura, Md Mamun Molla
Summary: This study investigates the effects of thermal radiation on the free convective laminar flow of power-law non-Newtonian water-Cu nanofluids over a wavy frustum of a cone. The numerical results show that the radiation-conduction parameter, surface heating parameter, and nanoparticle volume fraction accelerate the convection process, leading to increased velocity, skin friction, and heat transfer rate. On the other hand, an increasing power-law index slows down the convection process, resulting in decreased velocity, skin friction, and heat transfer rate.
PRAMANA-JOURNAL OF PHYSICS
(2023)
