Articles
Zhang, Q.,
Li, X.,
Ali, A.B.,
Sawaran singh, N.S.,
Yazdekhasti, A.,
Pirmoradian, M.,
Marzouki, R. Case Studies in Thermal Engineering (2214157X)72
The increase in performance of home heaters, accompanied by energy and environmental crises, becomes noticeable in the construction industry. Hence, this paper has investigated a solution to enhance the system's efficiency. For this purpose, a novel experimental set-up is provided to simulate the heater, exhaust heater, and indoor environment. This setup includes two boxes, a heat source controlled by a Proportional Integral Derivative (PID) controller and an aluminum box with copper tubes. The heat is transferred from the first box as a heater to the aluminum box as a heat exhaust by the air force of the fan to warm the second box. Also, Lauric acid as a phase change material (PCM) and metal foam are used to increase heat absorption and heat transfer inside the heater exhaust regarding the thermal and physical properties of these two materials. Seven temperature sensors are located in different places to evaluate and control the system. Moreover, 6 modes are designed to find the best arrangement of materials for improving the system. The results show that a new arrangement of materials defined as filling the aluminum box with PCM and covering this box with metal foam, acquires remarkable efficiency. According to the achieved data, the mentioned design can decrease the outlet temperature of exhaust up to 2.3 ± 0.1 °C as well as increase the second box temperature in a home environment to 1.6 ± 0.1 °C. Finally, this mode can improve the efficiencies of the system both in outlet temperature and indoor temperature of the second box as much as 4.73 ± 0.1% in the former and 3.72 ± 0.1% in the latter. © 2025 The Authors.
Sawaran singh, N.S.,
Ali, A.B.,
Abed hussein, M.,
Mohammed, J.K.,
Kharraji, O.,
Pirmoradian, M.,
Hashemian, M.,
Salahshour, S. Case Studies in Chemical and Environmental Engineering (26660164)11
This study aims to explore the dynamic instability of micro and nano-sized Timoshenko beams as they are traversed by sequentially moving nanoparticles. The beams, characterized by a rectangular cross-section and homogeneity, are situated within a Pasternak foundation, which provides a supportive elastic medium. The research investigation determines nanoparticle inertia effects at velocity while establishing motion equations through Hamilton's principle. The model unites nonlinear von Kàrmàn strain-displacement kinematics with strain gradient theory and Gurtin-Murdoch small-scale accounting. The system's behavior gets analyzed through the implementation of Galerkin method which derives time-periodic motion equations. The incremental harmonic balance approach develops stability boundary maps that separate stable and unstable regions through which analysts can examine parameter spaces containing moving particle mass and velocity values. This study evaluates how different parameters like beam diameters together with small-scale characteristics and elastic medium constants and residual stress and axial compressive forces affect the stability diagram. The analysis demonstrates that stability parameters become substantially modified when researchers include length scale characteristics along with surface effects. The outcome reveals that axial compressive forces reduce stability yet environmental effects strengthen the stability of small-scale beams which leads to transition curve movements towards faster moving particles velocities. This study contributes fundamental knowledge about dynamic instability effects in small-scale beams which will help future advances in nanotechnology and materials science. © 2025 The Authors
Ali, A.B.,
Hussein, R.A.,
Sawaran singh, N.S.,
Salahshour, S.,
Pirmoradian, M.,
Mohammad sajadi s., S.M.,
Deriszadeh, A. International Journal of Thermofluids (26662027)26
This work examines the impact of different pressure levels (1 to 5 bar) and magnetic field frequencies (0.01 to 0.05 ps⁻¹) on the thermal behavior of sodium sulfate/magnesium chloride hexahydrate as a phase change material inside iron nanochannels, using molecular dynamics simulation. The system's kinetic and potential energies converge to 39.79 eV and -7204.99 eV, indicating the stability of the nanostructures. The impact of pressure and magnetic field frequency on heat flow, maximum temperature, and charge/discharge times was examined. Increasing the pressure from 1 to 5 bar reduced the heat flux and maximum temperature to 1509 W/m² and 391.18 K, respectively. Simultaneously, the charge duration extendes to 3.99 ns, whilst the discharge duration decreases to 4.30 ns. Moreover, increasing the magnetic field frequency from 0.01 to 0.05 ps⁻¹ results in a decrease in maximum temperature and heat flux, which fell to 415.67 K and 1566 W/m², respectively. The charge time decreases to 3.87 ns and the discharge time to 4.50 ns little owing to the increase in frequency. © 2025 The Author(s)
Sawaran singh, N.S.,
Hassan, W.H.,
Ameen ahmed, Z.M.,
Al-zahy, Y.M.A.,
Salahshour, S.,
Pirmoradian, M. Case Studies in Chemical and Environmental Engineering (26660164)11
This study presents an investigation into the vibration resonance of Mindlin piezoelectric polymeric nanoplates under electromechanical loading, particularly in the presence of a rotating nanoparticle. The novelty of this research lies in the application of non-local piezoelasticity, which effectively incorporates the influence of small-scale factors on the resonance behavior of the nanoplate. By employing a variational approach to derive the governing equations, this work advances the understanding of how various parameters such as the non-local parameter, dimensions of the nanoplate, excitation voltage, and mass of the nanoparticle affect resonance frequencies. The Galerkin method is utilized to solve the partial differential equations governing the dynamics of the piezoelectric polymeric nanoplate, marking a significant methodological contribution to the field. The incremental harmonic balance approach is then applied to estimate the system's resonance frequencies, with numerical simulations confirming their existence. This research not only elucidates the complex interactions affecting resonance behavior but also highlights the potential for optimizing the design of nanostructures in various applications, including sensors and energy-harvesting devices. The findings suggest that increasing the non-local parameter softens the nanoplate's rigidity, leading to decreased resonance frequencies, while modifications in dimensions and applied voltages can enhance these frequencies. Overall, this study lays the groundwork for future explorations into the dynamic behavior of piezoelectric materials, emphasizing the importance of small-scale effects in nanotechnology applications. © 2025 The Authors
