Article
Thermodynamics
Dehai Kong, S. A. Isaev, Wei Li, Shaoqiu Chen, Cunliang Liu, Tao Guo
Summary: This study numerically investigated the influence of spherical dimple-protrusion (SDP) structures with negative Poisson ratio characteristics on turbulent flow and heat transfer in a rectangular channel. The results showed that increasing the dimple depth-to-diameter ratio and density improved the heat transfer performance, and increasing the Reynolds number first enhanced the heat transfer coefficient before stabilizing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Engineering, Mechanical
Priyajit Mondal, T. R. Mahapatra
Summary: This study investigates the double diffusive, MHD, mixed convection flow of Al2O3-water nanofluid in a trapezoidal enclosure, considering various inclination angles and aspect ratios. The research focuses on entropy generation related to heat transfer and mass transfer, finding that lower Richardson numbers lead to reduced entropy generation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Multidisciplinary Sciences
Wasim Jamshed, M. Prakash, S. Suriya Uma Devi, Rabha W. Ibrahim, Faisal Shahzad, Kottakkaran Sooppy Nisar, Mohamed R. Eid, Abdel-Haleem Abdel-Aty, M. Motawi Khashan, I. S. Yahia
Summary: The research explores a novel hybrid nanofluid for efficient heat transfer, investigating the viscoelastic elements of the process and comparing results in critical physical conditions to aid future optimization. The study integrates various flow and thermal facts, using numerical computations and entropy generation analysis to examine energy balance and resistance factors.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Ibrahim Umar Ibrahim, Mohsen Sharifpur, Josua P. Meyer
Summary: The experimental investigation focused on the effects of particle size on the entropy and exergy characteristics of AL(2)O(3)-MWCNT hybrid nanofluid in transitional flow regime. The results showed that the nanofluid with Al2O3 (20 nm) and MWCNT (<7 nm) exhibited the best performance, with reduced frictional and thermal entropy.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Naifa S. Alatawi, Abeer M. Almutairi, S. A. Khalil, Asma Obaidallah Alatawi, Wejdan Al-Anazi, Mourad Magherbi
Summary: This paper investigates heat transfer and entropy generation caused by mixed convection in an inclined channel with nanofluid jets for cooling photovoltaic panels. The numerical solution of the governing flow equations is obtained using COMSOL software. The effects of inclination angle, Reynolds number, and nanoparticle fraction on heat transfer and entropy generation are examined. The results show that the angle of inclination has a weak effect on heat transfer and thermal irreversibility, while the nanofluid concentration and Reynolds number have a significant impact. The increase in nanoparticle concentration leads to a 15% increase in Nusselt number and thermal irreversibility.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Muhammad Imran Khan, Muhammad Ijaz Khan, Sami G. Al-Ghamdi
Summary: This study investigates the application of nanofluids in solar thermal systems and explores the characteristics of entropy production in hydro-magnetic reactive unsteady flow. The results show that various parameters affect the thermal field, fluid flow, and concentration.
SCIENTIFIC REPORTS
(2022)
Article
Thermodynamics
Amin Shahsavar, Seyed Saman Alimohammadi, Ighball Baniasad Askari, Hafiz Muhammad Ali
Summary: The numerical investigation of force convection flow of non-Newtonian water/CMC-CuO NF in three wavy channels and a straight channel was conducted. The study found that the influence of Re and nanoparticle concentration phi on pressure drop, Nu, and global entropy generation rates differed. Increasing Re and decreasing phi resulted in higher Nu values for all four channels, with the sinusoidal channel having the highest Nu. The trapezoidal channel had the highest pressure drop and total global entropy generation rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Navid Alipour, Bahram Jafari, Kh. Hosseinzadeh
Summary: To address the challenge of thermal performance and heat loss in energy conversion systems, this study simulated a trapezoidal cavity with a wavy top wall containing water/ethylene glycol GO-Al2O3 nanofluid using the Galerkin finite element method. The effects of physical parameters, such as porosity, thermal radiation, magnetic field angle, Rayleigh number, and Hartmann number, on thermal performance and fluid flow were investigated. The optimized values for these parameters were determined to be 1214.46, 2.86, 0.63, 0.24, and 59.35, respectively. By applying RSM and Taguchi integration, the highest average Nusselt number of 3.07 was achieved, indicating improved thermal performance.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
T. N. Abdelhameed
Summary: The analysis focuses on observing the optimized flow of Casson nanofluid, taking into account external heat generation and mixed convection features. Chemical reactive species have an order one influence on the problem, and the significance of the Bejan number is evaluated. The study reveals a vertically moving flow with convective heat, and the modeled problem is simplified using dimensionless form. The analytical outcomes are obtained through the implementation of Laplace technique, and the graphical impact of various parameters is assessed. The insight into skin friction and Nusselt number is gained through different curves. It is observed that entropy generation increases due to the porosity parameter and magnetic number, while it decreases with increasing Casson fluid parameter and chemical reaction constant for the Bejan number.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Auwalu Hamisu Usman, Noor Saeed Khan, Usa Wannasingha Humphries, Zafar Ullah, Qayyum Shah, Poom Kumam, Phatiphat Thounthong, Waris Khan, Attapol Kaewkhao, Amyia Bhaumik
Summary: In this study, the behavior of an Oldroyd-B nanoliquid film sprayed on a stretching cylinder was investigated, with the presence of gyrotactic microorganisms with heat and mass transfer flow. The governing equations were made non-dimensional and solved using the homotopy analysis method. The results showed that velocity decreases with magnetic field strength and nanofluid parameter, while temperature increases with Brownian motion parameter. The concentration of nanoparticles, gyrotactic microorganism density, and film size are also influenced by various factors.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Amin Kardgar
Summary: The study investigated conjugate heat transfer of natural convection and entropy generation of nanofluid in an inclined square cavity enclosure with an external magnetic field. The findings showed that increasing nanoparticle volume fraction, inclination angle, Ra number, and solid to fluid conductivity ratio could lead to different effects on heat transfer and entropy generation in the system. The study provides valuable insights into the behavior of nanofluid flow and heat transfer in the presence of an external magnetic field.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Energy & Fuels
Periklis Mountrichas, Wendi Zhao, Mehtab Singh Randeva, Prodip K. Das
Summary: Entropy generation and heat transfer in cavities have received significant interest due to the demand for enhancing thermal performances. This study investigates the entropy generation and heat transfer of CuO-water nanofluid in a confined cavity with a moving top wall and a rectangular fin at the bottom. The results indicate that nanofluids can improve heat transfer rate and minimize entropy generation compared to conventional heat transfer fluids.
Article
Multidisciplinary Sciences
Enran Hou, Azad Hussain, Aysha Rehman, Dumitru Baleanu, Sohail Nadeem, R. T. Matoog, Ilyas Khan, El-Sayed M. Sherif
Summary: This study investigates the entropy generation, induced magnetic field, and mixed convection stagnant point flow of pseudoplastic nano liquid over an elastic surface using numerical methods. The research shows that the velocity increases and temperature decreases with a rise in magnetic parameters, while the mass transfer patterns change based on the buoyancy ratio, mixed convection, and stretching parameters.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics, Applied
Amjid Rashid, Abdullah Dawar, Muhammad Ayaz, Saeed Islam, Ahmed M. Galal, Humaira Gul
Summary: This study investigates the flow characteristics of a water-based hybrid nanofluid consisting of silver and alumina nanoparticles past a spinning disk. The effects of Brownian motion, activation energy, magnetic field, and thermophoresis are taken into account. The partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) through suitable correspondence transformations. The modeled equations are solved using a semi-analytical method known as HAM. Graphical representations of the nanofluid and hybrid nanofluid profiles are used. The findings show a decrease in the radial and tangential velocities of the nanofluids and hybrid nanofluid with an increase in the magnetic factor. The hybrid nanofluid exhibits higher growth and better thermal conductivity than the nanofluids due to the magnetic factor.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Mechanics
Surabhi Nishad, Rama Bhargava, Ameeya Kumar Nayak, Bernhard Weigand
Summary: Energy flux analysis of power-law fluid is a novel contribution to recent developments in computational fluid dynamics. The study investigates the influence of double diffusive effect on unsteady two-dimensional flow inside a complex enclosure and proposes a method for optimizing heat transfer rate. By comparing the computational time and accuracy of the finite volume method and element-free Galerkin technique, the study obtains results such as streamlines, isotherms, isoconcentrations, average Nusselt number, Sherwood number, etc., and analyzes the impact of various parameters. In addition, the study employs a mesh-free approach, providing a new method for further analysis of elliptical/semi-elliptical structures.