Article
Thermodynamics
Ramaswamy Devakottai Sundaram, Srivatsan Madhavan, Prashant Singh, Srinath Ekkad
Summary: Combining array jet impingement with concentric micro pin-fins leads to enhanced heat dissipation without significant increase in pumping power. Additive manufacturing allows for the production of roughness elements with high accuracy, improving the manufacturability of such configurations. Experimental and numerical studies were conducted to characterize the heat transfer performance and validate the computational model, demonstrating the effectiveness of concentric micro pin-fins in heat transfer applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zhaoda Zhang, Guanghan Yan, Mingrui Sun, Han Yan, Jiafei Zhao, Yongchen Song, Yu Liu
Summary: Metal foams are commonly used in enhanced heat transfer studies due to their large specific surface areas. Modified metal foams with gradient structures are preferred to reduce high pressure drop. A computational fluid dynamics analysis was conducted to investigate the forced convective heat transfer of metal foam samples with uniform and gradient structures. The gradient metal foam showed improved overall heat transfer performance when arranged from small to large porosity, and the gradient structure was better than the uniform structure at a given porosity value.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
Binbin Pei, FangBo Li, Kunpeng Zhao, Liang Zhao, Bofeng Bai
Summary: The study focuses on the dynamics of vortical structures in an isothermal turbulent channel flow at supercritical pressure, revealing the complicated effects of variations in thermo-physical properties. The findings include changes in flow direction and the increase of vortex sheets and tubes near the cold wall, as well as the modulation of typical hairpin vortices. Additionally, the study confirms the increased turbulence anisotropy and stronger vortex stretching in cases with variable properties.
Article
Thermodynamics
Ahmet Umit Tepe
Summary: This study investigated the effect of a newly proposed punched triangular ramp vortex generator on heat transfer performance for a fin-tube heat exchanger through numerical simulations. The results showed that the ramp angle had a more significant influence on thermo-hydraulic performance compared to ramp height.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Sulaiman M. Alsaleem, Lesley M. Wright, Je-Chin Han
Summary: This study experimentally investigates the regionally averaged heat transfer distributions and friction characteristics in a rectangular channel with fully developed turbulent flow. Results show that increasing the number of ribbed walls improves the overall channel heat transfer for the 45-degree parallel ribs. Friction and heat transfer roughness functions are derived based on the law of wall similarity and further correlations are developed over the roughness Reynolds number range to predict friction and heat transfer in rectangular cooling channels with various numbers of ribbed walls.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Mingrui Sun, Lunxiang Zhang, Chengzhi Hu, Jiafei Zhao, Dawei Tang, Yongchen Song
Summary: Optimizing the pore structure of metal foam is considered a feasible approach for improving overall heat transfer performance. The study found that throat area could not effectively optimize heat transfer performance, but the area goodness factor j/f was higher than conventional Kelvin cells.
Article
Thermodynamics
Mohammad Lakhi, Ali Safavinejad
Summary: In this study, the lattice Boltzmann method was applied to analyze heat transfer in fluid flow between two horizontal plates. The results were validated and the impact of radiation heat transfer parameters was determined. The optical thickness parameter was found to have the most significant influence on radiative heat transfer.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Physics, Multidisciplinary
Felix Schindler, Sven Eckert, Till Zuerner, Joerg Schumacher, Tobias Vogt
Summary: In highly turbulent liquid metal convection experiments, the large-scale flow structure and the turbulent transfer of heat and momentum were directly measured. It was found that the aspect ratio has a significant impact on the scaling laws for heat and momentum transfer.
PHYSICAL REVIEW LETTERS
(2022)
Article
Thermodynamics
Benedetto Mele, Gianpaolo Ruocco
Summary: This paper presents convection/conduction simulations to investigate the flow and heat transfer phenomena in a steady-state plate with embedded discrete heaters, subjected to a turbulent cooling jet. The results show that the configuration and properties of the discrete heaters have a significant influence on the heat transfer performance and temperature distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
K. Kundu, U. K. Sarkar
Summary: This study analyzes the laminar flow through a semi-elliptic annulus formed between two confocal elliptical ducts driven by a constant pressure-gradient. Using the elliptic cylindrical coordinate system, exact solutions for wide and narrow semi-elliptic annuli are obtained. The velocity distribution, volume flow rate, shear stress, and Poiseuille number are expressed using non-dimensional physical parameters. The results show characteristic differences between wide and narrow semi-elliptic annuli. Additionally, a numerical method is formulated for obtaining the numerical solution, which agrees with the analytical results. Published under an exclusive license by AIP Publishing.
Article
Green & Sustainable Science & Technology
Changhui Liu, Yu Qiao, Peixing Du, Jiahao Zhang, Jiateng Zhao, Chenzhen Liu, Yutao Huo, Cong Qi, Zhonghao Rao, Yuying Yan
Summary: The paper summarizes recent progress in the preparation of nanofluids and their application in micro/nano scale heat and mass transfer, emphasizing the significance of nanofluids in efficient heat transfer and energy conservation.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Ji-Xiang Wang, Zhe Wu, Ming-Liang Zhong, Shuhuai Yao
Summary: The paper introduces a data-driven approach to predict transient thermal performance using data from various methods, achieving high accuracy. A neural network model is trained to give accurate estimations for testing sets in a short processing time.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Inderjot Kaur, Prashant Singh
Summary: This article presents the conjugate heat transfer characteristics of strut-based sandwich-type configurations with different unit cell topologies. The results show that the Tetrakaidecahedron lattice has the highest overall heat transfer coefficient, followed by Octet and Rhombic dodecahedron. The Octet configuration has the highest pressure drop, followed by Rhombic dodecahedron and Tetrakaidecahedron. The thickness of the struts in contact with the endwall plays a dominant role in the conjugate thermal exchange of the sandwich configurations. Under the investigated conditions, the Tetrakaidecahedron-based lattice provides the least thermal resistance value at any given pumping power condition.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2022)
Article
Thermodynamics
Zhen Liu, Ziyun Wang, Peiyi Li, Haofeng Qin, Wenlei Heng
Summary: This study investigates the flow and heat transfer characteristics of molten phase change material (PCM) under flow boundary condition using numerical methods. It is found that different boundary conditions result in different flow and heat transfer characteristics. Increasing Reynolds number improves heat transfer efficiency and reduces temperature in forced convection boundary conditions. The study also quantifies the influence of each factor on heat transfer.
APPLIED THERMAL ENGINEERING
(2022)
Editorial Material
Thermodynamics
Prakash S. S. Hiremath
Summary: This paper presents a critical review of a research paper on the transportation of hybrid nanoparticles in forced convective Darcy-Forchheimer flow. The review points out that the proposed similarity solutions and subsequent mathematical analysis are incorrect, leading to invalid conclusions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Environmental Sciences
Masoud Derakhshandeh, Tahir Atici, Umran Tezcan Un
Summary: This study investigated wild-type microalgae species isolated from the Porsuk River in Central Anatolia, Turkey as potential energy production feedstock and carbon dioxide sink. Experimental data revealed species like Gleocystis ampula with high growth and carbon dioxide fixation rates, and Scenedesmus quadricauda (I) with the highest lipid content. Promising large scale applications for biodiesel production and carbon dioxide mitigation were suggested with improved process efficiency.
WASTE AND BIOMASS VALORIZATION
(2021)
Article
Energy & Fuels
Masoud Derakhshandeh, Funda Ates, Umran Tezcan Un
Summary: The study found that the optimal pyrolysis temperature for microalgae biomass was 500 degrees Celsius and 600 degrees Celsius, resulting in higher bio-oil yield.
BIOENERGY RESEARCH
(2021)
Review
Green & Sustainable Science & Technology
Farhad Ghadyanlou, Ahmad Azari, Ali Vatani
Summary: This review investigates a process intensification equipment known as a rotating packed bed (RPB), which improves transport in the gas-liquid field via centrifugal force, especially in absorption. Different types of RPB, their advantages, effects on hydrodynamics, mass transfer, and power consumption under available models are analyzed. The study demonstrates the use of suitable dimensionless numbers for a more realistic definition of the system, and highlights the effectiveness of certain factors in mass transfer modeling.
Article
Green & Sustainable Science & Technology
Noorveas Pahnavar, Fatemeh Keramat, Ahmad Azari, Shahriar Osfouri
Summary: This study investigated the numerical parametric analysis of CO2 removal using NFs in a gas-liquid hollow fiber membrane contactor. CNT NFs outperformed SiO2 NFs, and the performance of CO2 removal improved with certain factors.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Engineering, Civil
Masoud Derakhshandeh, Mustafa Tombul
Summary: Efficient tools for estimating water loss through evapotranspiration are crucial for water resources management. The integration of high resolution spatial imagery in well-tuned models like METRIC shows potential for accurate evapotranspiration rate estimations. It is important to calibrate the model with various spatial data sources and incorporate new empirical correlations for improved accuracy.
WATER RESOURCES MANAGEMENT
(2022)
Article
Materials Science, Multidisciplinary
Mojtaba Esmailzadeh, Maryam Delshah, Seyedeh Mina Amirsadat, Ahmad Azari, Rouhollah Fatehi, Mohsen Rezaei, Hasan Bazai, Farhad Ghadyanlou, Amir Saidizad, Mohsen Sharifpur
Summary: This paper focuses on the failure analysis of 7175 aluminum alloy compressor impellers, characterizing the chemical composition, microstructure, and hardness tests to evaluate the base alloy. It identifies significant stress concentration at the root of the blades, leading to fatigue phenomenon.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Farhad Ghadyanlou, Ahmad Azari, Ali Vatani
Summary: This research examines two approaches, rotating packed bed (RPB) and nanofluids, to enhance CO2 capture and maximize the experimental mass transfer coefficient. The study finds that Al2O3 nanofluid is more effective than other types, particularly the 40 nm size, in enhancing mass transfer.
Article
Energy & Fuels
Masoud Derakhshandeh
Summary: This study applies a life cycle energy assessment to estimate the efficiency of different products derived from microalgae biomass as a bioenergy source. The authors found that the type of photobioreactor (PBR) used has a major impact on energy efficiency, with the raceway PBR achieving a net energy efficiency of 3.5 in the best scenario.
BIOENERGY RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Mehmet Cetin, Ozge Isik Pekkan, Mehtap Ozenen Kavlak, Ilker Atmaca, Suhrabuddin Nasery, Masoud Derakhshandeh, Saye Nihan Cabuk
Summary: This study used geographical information systems and remote sensing methods to study the forest fire risk in the Milas district of Turkey and developed a risk map. The effectiveness of the risk map was confirmed through comparison with actual fire incidents.
Review
Engineering, Chemical
Mohammad Jamali, Ahmad Azari
Summary: In this study, numerical simulations of CO2 absorption columns using CFD strategy were conducted, along with the application of various types of amine-based solutions. The effect of different packing mesh generation on the efficiency of absorption columns was also investigated, and potential future research directions, such as the use of various nanoparticles and activators in different amine-based solutions, as well as double diameter packed bed and rotating packed columns with double diameter, were proposed.
CHEMBIOENG REVIEWS
(2023)
Article
Engineering, Environmental
Hamed Mohammaddoost, Maryam Asemani, Ahmad Azari, Behzad Vaferi
Summary: New polymeric pipes have been used to overcome the challenges posed by metal pipes in gas transmission, such as corrosion and leakage. This study investigates the diffusivity and potential leakage of methane and ethane gases in glass-reinforced epoxy (GRE) composite using diffusion and solubility cells. The results demonstrate that the diffusivity of both gases increases with temperature, while gas solubility decreases. Furthermore, novel correlations for estimating gas diffusion coefficient and mass flow rate have been developed based on experimental data.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Hoda Gholamifard, M. G. Rasul, Hossein Rahideh, Ahmad Azari, Mohsen Abbasi, Rahim Karami
Summary: Single and multi-bed adsorption columns for oily wastewater treatment were studied experimentally and numerically using natural zeolite and calcined bentonite as adsorbents. The experimental results showed that natural zeolite outperformed calcined bentonite in treating oily wastewater, and adsorption kinetics were best described by Freundlich and Langmuir isotherms. Simulation results demonstrated that multi-fixed-bed columns with series connections had the highest separation yield of 99.98%.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2023)
Article
Energy & Fuels
Nadjiya Fettah, Masoud Derakhshandeh, Umran Tezcan Un, Larbi Mahmoudi
Summary: This research examines the effects of light on the growth of Scenedesmus quadricauda, a green microalgae. The study finds that optimal growth occurs at specific wavelengths and moderate light intensities, while high or low intensities inhibit growth.
INTERNATIONAL JOURNAL OF ENERGY AND ENVIRONMENTAL ENGINEERING
(2022)
Review
Engineering, Environmental
Zahra Alipour, Ahmad Azari
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)
Article
Engineering, Environmental
Peymaneh Dehghan, Ahmad Azari, Reza Azin
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)