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Dr. Rehena Nasrin

Professor
Specialization
Specialization
Computational Fluid Dynamics, Numerical Modeling, Heat-Mass Transfer, Photovoltaic Thermal System
Academic Biography
Contact
- Email: rehena@math.buet.ac.bd
- Mobile: +880-1766924295
Educational Information
- Post Doc., University of Malaya, 2017
- Ph.D., BUET, 2015
- M.Phil., BUET, 2009
- M.Sc., DU, 2002
- B.Sc., DU, 2000
Research Interests
- Computational Fluid Dynamics
All Publications |
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I. Zahan,
R. Nasrin,
S. Hasan
Numerical Simulation of Heat Transfer Performance of Ionanofluid Flow inside Two Connected Oblique Triangular Enclosure SSRN, May, 2023 Publication Type: Conference View Summary/Abstract , Publication Link
Utilizing ionanofluid is one of the best ways to improve the thermal performance of working fluids for storage,
energy conversion, and transportation in contemporary thermal systems. It is a group of nano dispersions where
ionic liquids create the continuous phase. This article's goal is to examine how various nanofluids perform when
the natural convection of long single-walled carbon nanotubes (SWCNTs) nanoparticle occurring in a cavity
which is made up of two connected oblique triangles. The cavity has a thin cold wall (Tc) with angular diameter
√2m. Both halves of the left and bottom walls are heated and kept at constant temperature (Th). The remaining
walls are insulated. The Navier-Stokes equations and energy conservation equation with appropriate boundary
conditions are applied for modeling the considered physics and FEM is used to solve it. The heat-transferring
mediums are assumed as the ionanofluid of SWCNT and 1-butyl-3-methylimidazolium
bis{(trifluoromethyl)sulfonyl}imide ([C4mim][NTf2]) ionic liquid (IL), nanofluid of water-SWCNT and pure
water. The effective parameters in a range of Rayleigh number (103 ≤ 𝑅𝑎 ≤ 106
) and solid concentration (0.1% ≤
𝜙 ≤ 5%) are considered. The findings show that due to higher thermal conductivity and appealing rheological
features of ionanofluid, the heat transfer rate is found significantly higher than nanofluid and pure water. A higher
solid concentration of SWCNTs represents greater values of mean Nusselt number. Additionally, fluid velocity
and heat transfer rate increase at larger values of Ra
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Md. Mosharrof Hossain,
Md. Hasanuzzaman,
R. Nasrin
Time-dependent thermal-material transfer of micropolar binary mixture fluid: Effects of Lorentz force and inclination SSRN, Proceedings of MARTEC-2022, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
The effects of Lorentz force and inclined angle on time-dependent free-convective thermal-material transport by micropolar binary mixture of fluid passing a continuous permeable surface have been analyzed in this article. Using the local similarity transformation, the governing partial differential equations have been converted into ordinary differential equations. The shooting technique was then employed to solve non-dimensional ordinary differential equations with boundary conditions using the "MATLAB ODE45" software. The effects of emerging Lorentz force (M) and inclined angle (γ) on the fluid velocity, concentration, temperature, and microrotation have been investigated within the boundary layer. Other non-dimensional parameters in this study, such as Schmidt number, suction parameter, and Prandtl number are kept fixed at Sc = 0.22, c = 0.5, and Pr = 0.71, respectively. The numerically simulated result shows that the velocity falls for uplifting values of the inclined angle and Lorentz force. The skin friction coefficient decreases by 49%, and 20% due to increasing the values of inclined angle (00-600), and Lorentz force (1.0 - 4.0), respectively. The surface couple stress is found to be increased about 24%, and 44% with the upturning values of M (1.0 - 4.0), and γ (00-600), respectively. Through this research, the behavior of the fluid flow has been explored.
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Mohammed Jahir Uddin ,
R. Nasrin
Radiation and heat generation effects on magneto-convective fluid flow over a vertical permeable plate SSRN, Proceedings of MARTEC-2022, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
The purposes of the current research are to study the consequences of radiation and heat generation on the time-dependent BL stream over a vertical permeable plate. The considered fluid is unsteady, viscous, and incompressible as well as electrically conducting. The heat transfer mechanism happens due to free convection. The non-dimensional PDEs of continuity, momentum, energy, and concentration are discussed using appropriate modifications. A set of nonlinear dimensionless PDEs can be solved by applying explicit finite difference method for numerical modeling. The stability and convergence analysis are additionally established to complete the formulation of the model. The thermo-physical effects of entering physical parameters (thermal radiation and heat generation) on the flow, thermal, and material fields are analyzed. For the physical interest, the variations in local and average skin friction, material, and heat transmission rates are also discussed. Studio Developer FORTRAN 6.2 and Tecplot 10.0 are used to simulate numerically the schematic model equations and graphical presentation. The present study is significances for petroleum engineering, agriculture engineering, nuclear power plants, gas turbines etc. The temperature is decreasing within the boundary layer for the increasing radiation. To see the rationality of the present research, we make a comparison of these outcomes and the consequences attainable in the literature with outstanding compatibility.
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R. Nasrin ,
Tasmin Akter Tripty
Numerical evaluation of overall efficiency for solar photovoltaic and thermal hybrid system IEEE, 2023 IEEE Conference on Power Electronics and Renewable Energy, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
Climate change and the exhaustion of conventional energy sources with the growing demand for energy have caused concern among researchers all over the world. Renewable energy sources are a long-term alternative to our reliance on fossil fuels and reduce carbon emissions. Solar energy is radiant light and heat from the Sun that is harnessed using a range of technologies such as solar power to generate electricity, solar thermal energy, and solar architecture. Photovoltaic thermal (PVT) is a hybrid system, which includes both thermal and electrical energy generations. A 3D solar photovoltaic and thermal hybrid system is considered in this study where the encloser of the heat exchanger is fabricated from corrosion resistive stainless-steel sheet, and uncovered surfaces to the air of the heat exchanger are insulated using the glass wool. The fins manual air circulation and the channels are made of aluminium. The top side of the fins is bended and tightly attached to the lower back floor of the solar PV panel, wherein heat switch from the PV panel to the fins happens via the conduction technique. The equations of the heat transfer for PV layers such as for glass, cell, fins, heat exchangers, and laminar flow equation for the fluid domain are solved numerically applying the finite element method (FEM). Temperatures of air at the inlet-outlet and solar cell of the PVT system, are obtained for the variation of solar irradiance from 200 to 400 W/m2 using the weather situation of Bangladesh. Finally, the overall efficiency is calculated under different weather conditions in Bangladesh. The numerical results depict that the new layout of the heat exchanger efficiently transfers heat to the circulating air and the overall efficiency of the PVT is greater at the lowest solar irradiance of 200 W/m2.
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Md. Mosharrof Hossain,
Md. Hasanuzzaman,
M.M.T. Hossain,
R. Nasrin
Time-dependent magneto-convective thermal-material transfer by micropolar binary mixture fluid passing a vertical surface ThaiJo, Science and Technology Asia, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
Time-dependent magneto-convective thermal-material transport by micropolar binary mixture passing a vertical permeable surface with chemical reaction, radiative heat transfer and thermophoresis has been studied numerically. The findings of this study have significant industrial applications in the production of molten polymers, pulps, fossil fuels, and fluids containing certain additives, etc. Applying the similarity analysis together with Boussinesq estimate, the governing PDEs have been modified into ODEs. These equations have been solved by applying shooting techniques with the help of “ODE45 MATLAB" software. The results of the numerical solutions of the problem involving velocity, temperature, concentration and micro-rotation are presented graphically for different dimensionless parameters and numbers, namely magnetic intensity, Damköhler number, thermophoresis, temperature dependent dynamicviscosity, thermal radiation, thermal Grashof number, solutal Grashof number, Prandtl number and Schmidt number. The magnetic intensity affects the velocity field only in the increase-decrease mode.An increase in Damköhler number and thermal radiation significantly enhances the velocity fieldswhile interrupting the rate of heat transfer within the boundary layer. The temperature dependent dynamic viscosity greatly enhances the velocity of the fluid but reduces the micro-rotation of the particles very near to the wall. Also, the increase of Prandtl number lessens conduction of heat while increasing the micro-rotation of the particles noticeably very adjacent to the surface.
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Mohammad Ali,
R. Nasrin ,
M.A. Alim
Axisymmetric boundary layer slip flow with heat transfer over an exponentially stretching bullet-shaped object: A numerical assessment Science Direct, Heliyon, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
The slip flow and thermal transfer inside the boundary layer are extremely significant for various problems in aerodynamics, wing stall, skin friction drag on an entity, high-level velocity aircraft, etc. The current research investigated the effect of the slip factor and shape factor on the axisymmetric bullet-shaped object by taking the viscous dissipation parameter and location parameter. The analysis is conducted for both fixed and moving bullet-shaped objects due to thinner and thicker surfaces. The governing equations are transformed into a system of ordinary differential equations using suitable local axisymmetric similarity transformations and solved by applying the spectral quasi-linearization method. A new correlation analysis is made for velocity and temperature gradients. It is observed that the boundary layer structure has no defined shape due to a thicker bullet-shaped object instead it forms a steep angle with the axis which is contradictory to the formation of the boundary layer. A negative correlation is observed for the parameters M, Ec, Q*, and s but a positive correlation is observed for the parameters such as Pr, P, λ, and ε. The surface thickness and stretching ratio significantly affect the fluid flow and heat transfer processes. It is also noticed that the thinner bullet-shaped object performs as a better cooling conductor compared to a thicker one. The skin friction is reduced in the case of a thinner bullet-shaped object compared to a thicker one. The present analysis reveals that the heat transfer rate and the friction factor may be helpful in industrial sectors for controlling the cooling rate and quality of the final product. This research brings forward to increase in the rate of heat transfer inside the boundary layer region. The result may help to design the various types of moving objects in the automobile engineering sector when the objects pass through the fluid.
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Mohammed Jahir Uddin,
R. Nasrin
A numerical appraisal of time-dependent magneto-convective thermal-material transfer over a vertical permeable plate Hindawi, March, 2023 Publication Type: Journal View Summary/Abstract , Publication Link
The objective of this work is to investigate the influences of thermal radiation, heat generation, and buoyancy force on the time-dependent boundary layer (BL) flow across a vertical permeable plate. The fluid is unsteady, incompressible, viscous, and electrically insulating. The heat transfer mechanism happens due to free convection. The nondimensional partial differential equations of continuity, momentum, energy, and concentration are discussed using appropriate transformations. The impressions of thermal radiation and buoyancy forces are exposed in the energy and momentum equation, respectively. For numerical model, a set of nonlinear dimensionless partial differential equations can be solved using an explicit finite difference approach. The stability and convergence analyses are also established to complete the formulation of the model. The thermophysical effects of entering physical parameters on the flow, thermal, and material fields are analyzed. The variations in local and average skin friction, material, and heat transfer rates are also discussed for the physical interest. The analysis of the obtained findings is shown graphically, and relevant parameters pointedly prejudice the flow field. Studio Developer FORTRAN 6.2 and Tecplot 10.0 are applied to simulate the schematic model equations and graphical presentation numerically. The intensifying values of the magnetic field are affected decreasingly in the flow field. The temperature profiles decrease within the BL to increase the value of radiation parameters. The present study is on the consequences for petroleum engineering, agriculture engineering, extraction, purification processes, nuclear power plants, gas turbines, etc. To see the rationality of the present research, we compare these results and the results available in the literature with outstanding compatibility.
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Md. Mehedi Hasan,
M.J. Uddin,
R. Nasrin
Magneto-convective nanofluid flow analysis in a square cavity driven by exothermic chemical reaction Science Direct, November, 2022 Publication Type: Journal View Summary/Abstract , Publication Link
We investigate the unsteady laminar convective magnetohydrodynamic nanofluids flow in a square cavity driven by an exothermic chemical reaction. Because exothermic chemical reactions are intrinsic in nanofluidic flow applications, we consider this exothermic chemical reaction in the analysis, which is governed by Arrhenius kinetics energy. A water-based nanofluid containing iron oxide (Fe3O4) nanoparticles is employed in the simulation. The square cavity is accurately propounded by a combination of suitable heating and flow conditions. The left vertical wall of the enclosure is considered a higher unevenly heated wall, the right vertical wall of the domain is considered a relatively cool constant temperature, and the upper and lower walls are considered insulating walls. Each wall assumes a no-slip condition. The nanofluid governing equations are transformed into the non-dimensional set of equations using similarity analysis and then modified into finite element equations. Galerkin's method in finite element analysis is used to obtain the results of the problem. The results show that the Rayleigh number, the Frank-Kamenetsky number, and the nanosolid volume ratio all have significant effects on the convective flow regime, and the average Nusselt number increases with these parameters. Due to the greater value of the Rayleigh number (Ra = 106), the average Nusselt number increased to 75.92%, and heat generation due to a strongly exothermic reaction (higher Frank-Kamenetskii number) can blow up the bounded solution. The water-Fe3O4 nanofluid achieves a greater rate of heat transfer (maximum 22.65%) than that of the base fluid.
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Md. Mosharrof Hossain,
R. Nasrin ,
Md. Hasanuzzaman
Radiative effect on unsteady magneto-convective heat-mass transport by micropolar binary mixture passing a continuous permeable surface Hindawi, November, 2022 Publication Type: Journal View Summary/Abstract , Publication Link
Radiation is an important branch of thermal engineering which includes geophysical thermal insulation, ground water pollution, food processing, cooling of electronic components, oil recovery processes etc. An analysis of unsteady magneto-convective heat-mass transport by micropolar binary mixture of fluid passing a continuous permeable surface with thermal radiation effect has been introduced in this paper. The governing equations are transformed into coupled ordinary differential equations along with Boussinesq approximation by imposing the similarity analysis. Applying the shooting technique, the obtained non-linear coupled similarity equations are solved numerically with the help of “ODE45 MATLAB” software. The results of the numerical solutions to the problem involving velocity, temperature, concentration and micro-rotation are presented graphically for different dimensionless parameters and numbers encountered. With an increase of suction parameter, the velocity distributions very closed to the inclined permeable wall decrease slightly where . But for the uplifting values of sunction, both micro-rotation profile and species concentration enhance through the boundary layer. The skin-friction coefficient increases about 61%, 13%, 27% for rising values of Prandtl number (0.71-7), radiation effect (0 - 1) and thermal Grashof number (5-10), respectively, but an adverse effect is observed for magnetic field (1 - 4), inclined angle and Schmidt number (0.22 - 0.75). Heat transfer and mass transfer reduce about 82%, 53%, respectively, in increasing of Pr (0.71-1) and 36%, 11%, respectively, in increasing of thermal radiation (0 - 1). The surface couple stress increases about 26%, 49%, 64% and 30% with the increasing values of magnetic field (1-4), inclination angle , suction (0-1) and Schmidt number (0.22-0.75), respectively. Finally, the present study has been compared with the earlier published results. It is observed that the comparison bears a good agreement.
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Shadman Sakib Priam ,
R. Nasrin
Numerical appraisal of time-dependent peristaltic duct flow using Casson fluid Science Direct, November, 2022 Publication Type: Journal View Summary/Abstract , Publication Link
Interruption of continuous process and decreasing flow rate over time are very common challenges in peristaltic flow. This research takes an initiative to restrain the thermal and fluid flow rate over time by unsteady finite element analysis of Casson fluid flow through a two-dimensional peristaltic duct. The time-dependent flow equation exists in conjugate forced convection and the energy equation consists of radiative heat flux and entropy reduction. The top and bottom walls of the peristaltic duct are considered as contact with air. A circular bolus is set up in the middle of the duct. Four types of Casson fluids like slurry, silicone oil, apple juice, and blood are used as working fluids. The finite element method of Galerkin's residual technique is applied to solve the leading second ordered non-linear partial differential equations with proper border conditions. The effects of pertinent parameters on entropy reduction and thermal transport are analyzed. Results are displayed qualitatively in terms of streamlines, vortex field, and heatline contours as well as quantitatively in the form of average temperature, mean thermal, viscous, and total entropy. The obtained numerical results show that thermal performance and entropy reduction are significantly influenced by forced convection, atmospheric characteristics, internal thermal radiation, and Casson fluids. Approximately 6.99% and 72.13% increment of temperature and flow irreversibility are found for shear stress variation of Casson fluid from thickening to thinning. Decreasing thermal performance of 18.71% and increasing energy loss of 38.07% are noticed within the variation of Casson fluids (slurry, silicone oil, apple juice, and blood). About 14.05% enhancement of thermal transport and 64.91% reduction of total entropy are observed due to increasing internal thermal radiation from 0.5 to 2. The numerical results from this research represent a better thermal and fluid flow rate over time compared to the experimental/existing methodology/numerical research. The obtained flow and thermal transport phenomena expose many attention-grabbing performances which deserve additional investigation on Casson fluid characteristics particularly the continuation of flow rate. A fine approach to the biological peristaltic system is offered by the results.
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