Open Access
ARTICLE
Abeer H. Falih*, Basima Salman Khalaf, Basim Freegah
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.049812
（This article belongs to the Special Issue: Passive Heat Transfer Enhancement for Single Phase and Multi-Phase Flows)
Abstract In this study, the primary objective was to enhance the hydrothermal performance of a dimpled tube by addressing areas with low heat transfer compared to other regions. To accomplish this, a comprehensive numerical investigation was conducted using ANSYS Fluent 2022 R1 software, focusing on different diameters of dimples along the pipe’s length and the distribution of dimples in both in-line and staggered arrangements. The simulations utilized the finite element method to address turbulent flow within the tube by solving partial differential equations, encompassing Re numbers spanning from 3000 to 8000. The study specifically examined single-phase flow conditions, with water utilized… More >
Open Access
ARTICLE
Ali Shokor Golam*
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.050218
（This article belongs to the Special Issue: Passive Heat Transfer Enhancement for Single Phase and Multi-Phase Flows)
Abstract The thermal-hydraulic performance of plain tubes with and without wire coils in turbulent regimes is investigated experimentally and numerically. The effects of wire coil distribution (circular cross section) within the tube were explored experimentally, and water was employed as the working fluid. The numerical simulation was carried out using software programmer ANSYS Fluent 2019 R3 using the finite-volume approach. In the turbulent regime, six cross-sectioned wire coils were analyzed, including: circular, rectangular, hexagonal, square, star shape, and triangle. The utilization of a tube with a wire coil has been shown to increase heat transfer rate and pump consumption. The results… More >
Open Access
ARTICLE
Yang Cao1,*, Jianshu Liu2, Xuhui Meng1
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.051208
（This article belongs to the Special Issue: Innovative Heat Transfer Fluids for Enhanced Energy Sustainability in Thermal Systems)
Abstract Boiling heat transfer, as an efficient heat transfer approach, that can absorb a large amount of latent heat during the
vaporization, is especially suitable for heat transfer occasions with high heat flux demands. Experimental studies
show that the surface tension coefficient of pure water can be reduced sharply (up to 25%) when it is magnetized
by a magnetic field applied externally. In this paper, magnetized water (MW) was used as the work fluid to conduct
boiling heat transfer experiments, to explore the influence of magnetization on the boiling characteristics of pure
water. The electromagnetic device was used to magnetize water,… More >
Open Access
ARTICLE
Md. Munirul Hasan1, Md Mustafizur Rahman2,*, Mohammad Saiful Islam3, Wong Hung Chan4, Yasser M. Alginahi5, Muhammad Nomani Kabir6, Suraya Abu Bakar1, Devarajan Ramasamy2
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.047428
（This article belongs to the Special Issue: Machine Learning and Data-Driven Techniques for Mass and Thermal Transport)
Abstract A vehicle engine cooling system is of utmost importance to ensure that the engine operates in a safe temperature
range. In most radiators that are used to cool an engine, water serves as a cooling fluid. The performance of a
radiator in terms of heat transmission is significantly influenced by the incorporation of nanoparticles into the
cooling water. Concentration and uniformity of nanoparticle distribution are the two major factors for the practical
use of nanofluids. The shape and size of nanoparticles also have a great impact on the performance of heat transfer.
Many researchers are investigating the impact of nanoparticles… More >
Open Access
ARTICLE
Kadhum Audaa Jehhef1, Ali J. Ali2, Salah H. Abid Aun1, Akram H. Abed3,*
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.047814
（This article belongs to the Special Issue: Computational and Numerical Advances in Heat Transfer: Models and Methods I)
Abstract The cavity with lid-driven is greatly used in mixing, coating, and drying applications and is a substantial issue in the study of thermal performance rate and fluid field. A numerical approach is presented to study the thermal distribution and passage of fluid in a lid-driven cavity with an upper oscillating surface and an attached baffle. The walls of a cavity at the left and right were maintained at 350 and 293 K, respectively. The upper oscillating surface was equipped with a variable height to baffle to increase the convection of the three kinds of TiO2, Al2O3, and CuO nanofluids with… More >
Open Access
ARTICLE
Yang Cao*, Xuhui Meng
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.049111
（This article belongs to the Special Issue: Advances in Computational Thermo-Fluids and Nanofluids)
Abstract In this paper, a new approach called the Eulerian species method was proposed for simulating the convective and/or boiling heat transfer of nanofluids. The movement of nanoparticles in nanofluids is tracked by the species transport equation, and the boiling process of nanofluids is computed by the Eulerian multiphase method coupled with the RPI boiling model. The validity of the species transport equation for simulating nanoparticles movement was verified by conducting a simulation of nanofluids convective heat transfer. Simulation results of boiling heat transfer of nanofluids were obtained by using the commercial CFD software ANSYS Fluent and compared with experimental data… More >
Open Access
ARTICLE
Ming Yan1, Caijiang Lu2,*, Pan Shi1,*, Meiling Zhang3, Jiawei Zhang1, Liang Wang1
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.048333
（This article belongs to the Special Issue: Two-phase flow heat and mass transfer in advanced energy systems)
Abstract In response to escalating challenges in energy conservation and emission reduction, this study delves into the complexities of heat transfer in two-phase flows and adjustments to combustion processes within coal-fired boilers. Utilizing a fusion of hybrid modeling and automation technologies, we develop soft measurement models for key combustion parameters, such as the net calorific value of coal, flue gas oxygen content, and fly ash carbon content, within the Distributed Control System (DCS). Validated with performance test data, these models exhibit controlled root mean square error (RMSE) and maximum absolute error (MAXE) values, both within the range of 0.203. Integrated into… More >
Open Access
ARTICLE
Ghobad Shafiei Sabet1,*, Ali Sari1, Ahmad Fakhari2,*, Nasrin Afsarimanesh3, Dominic Organ4, Seyed Mehran Hoseini1
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.048290
（This article belongs to the Special Issue: Heat and Mass Transfer in Thermal Energy Storage)
Abstract This study conducts both numerical and empirical assessments of thermal transfer and fluid flow characteristics in a Solar Air Collector (SAC) using a Delta Wing Vortex Generator (DWVG), and the effects of different height ratios (Rh = 0.6, 0.8, 1, 1.2 and 1.4) in delta wing vortex generators, which were not considered in the earlier studies, are investigated. Energy and exergy analyses are performed to gain maximum efficiency. The Reynolds number based on the outlet velocity and hydraulic diameter falls between 4400 and 22000, corresponding to the volume flow rate of 5.21–26.07 m3/h. It is observed that the delta wing… More >
Open Access
ARTICLE
Olanrewaju M. Oyewola1,*, Olawale S. Ismail2, Adetokunbo A. Awonusi2
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.047714
Abstract One of the new methods for ensuring that the battery in a thermal energy storage system is kept at the proper temperature is the heat pipe-based Thermal Management System (TMS). In this study, the improvement of cooling performance of a heat pipe based TMS is examined through the variation of condenser section length of heat pipes in an array. The TMSs with an array of heat pipes with different condenser section lengths are considered. The system performances are evaluated using a validated numerical method. The results show that a heat pipe-based TMS provides the best cooling performance when a wavy-like… More >
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