Article
Thermodynamics
Alexander W. Raymond, Srinivas Garimella
Summary: A distributed-parameter model of a sorption bed heat and mass exchanger is presented, showing substantial temperature differences and uptake variations during the heating stage. Improvements in contact heat transfer coefficient between adsorbent and tube lead to significant reductions in sorption bed cycle time.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Ayyasamy Krishnamoorthy Babu, Govindaraj Kumaresan, Vincent Antony Aroul Raj, Sharmila Babu Vishal Surya
Summary: In this study, a CFD simulation model based on experimental investigation was developed to study the heat and mass transfer during the drying of Amaranth leaves in a CFD optimized drying chamber of a heat pump dryer. The results of the CFD simulation were validated with experimental results and showed a maximum deviation of less than 8%. This new CFD methodology can be used as a generic procedure for evaluating the effectiveness of a HPD for drying various types of leaves.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Thermodynamics
Ibrahim Albaik, Raya Al-Dadah, Saad Mahmoud, Mohamed A. Ismail, Mohammed K. Almesfer
Summary: This study investigates the performance of wire finned tube adsorber bed with an integrated aluminium fumarate metal-organic framework material. The results show that the coated wire finned heat exchanger outperforms other integration methods in terms of water production and cooling power. The optimum geometric parameters and coating thickness are also determined to achieve maximum output.
Article
Thermodynamics
Feifan Huang, Weijun Liu, Shuhua Zhang, Shaoai Chen, Furao Ren
Summary: This paper develops a multi-phase porous media heat and mass transfer model, which accurately calculates the thermal desorption characteristics of mixed adsorbates in spent activated carbon and considers the presence of residual adsorbates. The feasibility of the model is verified by comparing computational simulation results with experimental results. The study reveals the temperature rise and liquid phase content characteristics of the spent activated carbon samples under constant heating conditions, as well as the dominance of vapor flow in the fluid flow within the thermally regenerated samples. Additionally, the design and comparison of different regeneration samples result in significant time savings for thermal regeneration of spent activated carbon.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Fangzhou Li, Daoguang Sun, Zhenting Zha, Ke Yang, Zefeng Ge, Huiyan Zhang
Summary: This study developed a three-dimensional comprehensive pyrolysis model to investigate the electromagnetic-thermal-hydraulic-chemical processes during biomass pyrolysis under microwave irradiation. The model was validated by comparing the temperature profiles of biomass samples under varying microwave powers against literature data, and it revealed the interaction between the distributions of the microwave electromagnetic fields in the cavity and inside the wood particles.
Article
Acoustics
Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Abdulaziz Alghyamah
Summary: This study investigates the effects of mass transport, heat transfer, and chemical reactions on bubble dynamics, with findings showing how acoustic amplitude and ultrasonic frequency impact the ambient bubble radius. Heat exchange is important at lower acoustic amplitudes, while mass transport becomes dominant at higher amplitudes. The observations remain consistent for bubbles around the optimum radius, with no significant impact observed for bubbles at the lower or higher limits of the investigated ranges.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
Maoren Wang, Li Liu, Changlong Xu, Liang Di
Summary: A numerical model was established to investigate the coupled heat and mass transfer process during thermal desorption of oil-based drill cuttings. The study found that the operating parameters had interactive effects on the mass and heat transfer of the cuttings, and the desorption process was not individual but mixed alternately.
Article
Green & Sustainable Science & Technology
Zhangxiang Wu, Shijun You, Tingting Jiang, Huan Zhang, Yaran Wang, Yan Jiang, Li Sha, Shen Wei
Summary: A novel air-source gas-fired absorption heat pump has been proposed for district heating, which is more efficient compared to traditional gas fired boilers. Through numerical analysis and experimental validation, the system was proven to be feasible and efficient for heating in cold regions under different operating conditions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
D. O. Glushkov, A. G. Kosintsev, G. V. Kuznetsov, V. S. Vysokomorny
Summary: The research investigates the interdependent physical and chemical processes occurring when gel fuel is ignited by a hot particle. The experimental data and numerical simulation results show good agreement, indicating the effectiveness of the developed mathematical model in predicting the ignition characteristics of gel fuel by hot particles.
Article
Green & Sustainable Science & Technology
G. Antony Casmir Jayaseelan, A. Surenderpaul, T. Thandial Selvam, A. Anderson, A. Senthilkumar, Avinash Malladi, R. Venkatesh, V. N. Aneesh, R. Saravanan
Summary: The investigation explores the utilization of different fluid pairs for effective utilization of solar thermal energy in heat pump applications, such as zeolite/water, silica gel/water, and alumina nanofluid/water. The effect of fluid pairs on heat transfer rate, thermal adsorption, and mass loss of heat pump is studied. The results revealed that alumina nanofluid-operated heat pump showed higher thermal adsorption behavior and heat transfer rate.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Thermodynamics
Santi Khamtree, Thanate Ratanawilai, Chayut Nuntadusit, Hormoz Marzbani
Summary: The study aimed to develop a three-dimensional numerical model to investigate heat and moisture transfer during rubberwood drying and conduct physical experiments for comparison. Results showed faster moisture content reduction in samples dried at 120 degrees Celsius, with the simulation model accurately predicting drying temperature and moisture content. The innovative kiln dryer designed in the study can help prevent wood deformation and reduce drying time.
HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
E. Inkeri, T. Tynjala, M. Nikku
Summary: Combining a heat pump with thermal energy storage is an efficient way to utilize variable renewable energy. This paper introduces a novel integration method for simultaneous consumption and charging of thermal energy storage using phase change materials. The concept is demonstrated in domestic hot water systems.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Haifeng Guo, Shanshui Zhou, Zhao Zhang, Yanli Song, Shaowen Shang, Xiangtao Gao
Summary: This study proposes a scheme of using a heat supply tower to heat groundwater, and conducts numerical simulations to analyze the influence of different air parameters on the heating performance. The results show that the best heating performance is achieved when the air velocity is 2.0 m/s and water flow velocity is 1.0 m/s. The study also analyzes the economy of the tower and concludes that the heating cost is lower.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Thermodynamics
Wandong Bai, Wei Chen, Mingfei Li, Mumin Rao, Minking K. Chyu
Summary: Numerical simulation for condensation applications is restricted by phase change modeling. An improved model with a controllable parameter of interfacial temperature difference is developed to overcome the inefficiency and difficulty in coefficient determination. The model is validated and shows good agreement with theoretical, empirical, and experimental results. It is capable of capturing heat transfer characteristics for various condensation applications and can support future research and application in multiphase flow in engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Agricultural Engineering
Dalong Jiang, Congcong Li, Zifan Lin, Yuntian Wu, Hongjuan Pei, Magdalena Zielinska, Hongwei Xiao
Summary: In order to understand the mechanism of material volume change during drying, numerical simulations were conducted considering and neglecting shrinkage. The simulation results were validated with experimental data. The results showed that considering shrinkage led to a closer match with the experimental data for moisture and temperature distributions. The volume shrinkage of carrot slices was significantly affected by temperature and relative humidity.
INTERNATIONAL JOURNAL OF AGRICULTURAL AND BIOLOGICAL ENGINEERING
(2023)
Article
Energy & Fuels
Sinem Donmus, Moghtada Mobedi, Fujio Kuwahara
Summary: A study was conducted on thermal non-equilibrium heat and fluid flow in a channel filled with aluminum foam, considering different pore densities and two-layer structures. Results showed that the Nusselt number of the 40 PPI channel was greater than the 5 PPI channel, and the two-layer aluminum foam channel had a higher Nusselt number than the uniform channel at a specific Reynolds number.
Article
Thermodynamics
Prakash H. Jadhav, N. Gnanasekaran, D. Arumuga Perumal, Moghtada Mobedi
Summary: In this contemporary study, a parametric analysis was conducted on partially filled high porosity metallic foams in a horizontal conduit to enhance heat transfer efficiency. Different models filled with aluminium foam of varying pore density and porosity were examined, showing that a 30 PPI aluminum foam performed best in terms of thermal performance factor among the PPI variations considered. The study also evaluated factors such as average wall temperature, average Nusselt number, and Colburn j factor to achieve optimal performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Gamze Gediz Ilis, Hasan Demir, Bidyut Baran Saha
Summary: The study analyzed the cooling performance of a novel adsorption chiller through central composite design and response surface methodology, with a focus on the dominant role of water flow rates in improving performance. A dynamics-based model developed using MATLAB/Simulink provided comprehensive analysis of the factors affecting cooling performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Prakash H. Jadhav, G. Trilok, N. Gnanasekaran, Moghtada Mobedi
Summary: Optimization study of flow through metal foams for heat exchanging applications is crucial for improving heat transfer and reducing pressure drop. Different metal foam configurations were considered and TOPSIS optimization techniques were used to determine the best structure configuration. Experimental results showed that a 30PPI aluminum foam with 80% filling on the inner lateral of the pipe performed the best when air is used as the working fluid.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Chunyang Wang, Xinghua Zheng, Ting Zhang, Haisheng Chen, Moghtada Mobedi
Summary: The study investigates the applicability of volume average method for analyzing heat and fluid flow in a closed cell porous medium numerically, showing that porosity and number of porous media unit cell can affect the agreement between two approaches.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
G. Trilok, K. Kiran Kumar, N. Gnanasekaran, Moghtada Mobedi
Summary: The study focuses on analyzing heat transfer and fluid flow characteristics in foam samples with an orderly varied combination of pore density and porosity. By utilizing the Darcy-Forchheimer flow model and LTNE thermal model, significant impacts of the combination of pore density and porosity on heat transfer characteristics are observed, and an efficient solution for mixed convection is achieved by blending asymptotic solutions for natural and forced convection.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Stefano Aneli, Antonio Gagliano, Hasan Demir, Giuseppe Marco Tina, Gamze Gediz Ilis
Summary: This study analyzed the performance of a solar-driven adsorption chiller in the Mediterranean area and explored the effectiveness and limitations of using photovoltaic/thermal panels as the energy source. The results showed that the investigated PVT-ADS system achieved significant cooling energy and electrical production during a typical summer day.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
G. Trilok, Kurma Eshwar Sai Srinivas, Devika Harikrishnan, N. Gnanasekaran, Moghtada Mobedi
Summary: This study investigates the relationships among the morphological characteristics of stacked wire-mesh porous media and provides correlations for key parameters. Numerical simulations are conducted to analyze the thermal and flow characteristics of this porous medium in a vertical channel. The proposed correlations can be used for numerical modeling of various samples of stacked wire-mesh porous media in heat transfer applications.
Article
Energy & Fuels
Ahmed Rezk, Abdul Ghani Olabi, Abdul Hai Alami, Ali Radwan, Hasan Demir, Shek Mohammod Atiqure Rahman, Sheikh Khaleduzzaman Shah, Mohammad Ali Abdelkareem
Summary: This paper investigates the feasibility of utilizing ethanol as a working fluid paired with silica gel for adsorption heat storage under sub-zero ambient conditions. The results show that silica gel/ethanol has better cyclic performance and energy conversion performance compared to silica gel/water, but the physical characteristics of ethanol molecules limit its storage potential.
Article
Energy & Fuels
Rawal Diganjit, N. Gnanasekaran, Moghtada Mobedi
Summary: This study numerically analyzed the heat transfer performance in a solar air heater and found that metal foam can effectively enhance heat transfer, especially when properly designed.
Article
Engineering, Chemical
Hasan Demir, Hande Demir, Biljana Loncar, Milica Nicetin, Lato Pezo, Fatma Yilmaz
Summary: This study investigated the drying kinetics and morphological changes of capers at different temperatures. The logarithmic model was found to be the best describing model for drying kinetics. The effective diffusivities and activation energy were also determined. Image processing revealed the reduction in diameter rate and the ANN models provided accurate predictions. The study provides valuable information for researchers and dryer designers studying the drying of capers and other foods.
JOURNAL OF FOOD PROCESS ENGINEERING
(2023)
Article
Thermodynamics
Ertugrul Cihan, Hasan Kaan Berent, Hasan Demir, Hakan F. Oztop
Summary: This manuscript investigates entropy analysis and improves energy storage of phase change material (PCM) using a honeycomb material. The honeycomb structure is a major tool for improving heat transfer rate, especially for solar radiation PV panels. The study explores the impact of honeycomb cell wall thickness, cell diameter, and honeycomb material types on heat transfer rate of paraffin. Numerical optimization techniques are used to determine the optimal parameters. The results show that the embedded metal cage has no effect on the total heat storage capacity of paraffin, and the ideal honeycomb cell has a uniform distribution of temperature and phase change.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Hasan Demir, Hande Demir, Biljana Loncar, Lato Pezo, Ivan Brandic, Neven Voca, Fatma Yilmaz
Summary: This study optimized the drying treatment of capers using convection, refractive window, and vacuum drying combined with ultrasonic pretreatment. The effects of drying temperature, ultrasonication time, and drying method on specific energy consumption (SEC) were investigated. The response surface methodology (RSM) determined the optimum drying-temperature-ultrasonication-time values for each drying method, while the artificial neural networks (ANN) model showed high suitability for optimizing SEC.
Article
Thermodynamics
Ahmed Rezk, Gamze Gediz Ilis, Hasan Demir
Summary: This article experimentally investigates and models the adsorption characteristics of silica gel/ethanol pair that can utilize low-temperature heat sources. The results showed high affinity and reversibility of the adsorption/desorption process. The study also determined the heat of adsorption and diffusion energy, as well as the suitable kinetic model for simulating the chemical adsorption/desorption processes.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Rami Habash, Gamze Gediz Ilis, Hasan Demir, Hakan Fehmi Oztop
Summary: This study aimed to design a low-grade heat driven ethanol-silica gel adsorption chiller, with experimental and numerical analysis confirming the improved performance achieved by lowering the desorption temperature of the silica gel/ethanol pair. The specific cooling power and volumetric cooling power values were found to be 20.2 Wkg1 and 4.5 kWm 3, respectively.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
