Article
Thermodynamics
Hawatchai Keawkamrop, Lazarus Godson Asirvatham, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwi
Summary: This study experimentally investigates the performance of crimped spiral fin-and-tube heat exchangers with a small tube diameter. The results show that the fin pitch and outer diameter have significant effects on the heat transfer characteristics and friction factor. Correlations between the Nu, j, and f are proposed for designing heat exchangers in the thermal industry.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
Parinya Kiatpachai, Thawatchai Keawkamrop, Lazarus Godson Asirvatham, Mehrdad Mesgarpour, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwises
Summary: We investigated the effect of different fin patterns on the air-side performance of a novel heat exchanger, louver spiral fin-and-tube heat exchangers (LSFTHXs). The results showed that the louver-spiral fin performed better than the plain-spiral fin in terms of heat transfer rate, heat transfer coefficient, and Colburn factor. There was no significant difference in pressure drop and friction factor between the louver-spiral and plain-spiral fins.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Samah Mustafa, Mahmoud M. Taha, Ahmed A. Zatout, Gomaa H. Sedahmed, Dina A. El-Gayar
Summary: Mass transfer at the external surface of a horizontal spiral tube exchanger is influenced by factors such as mixing intensity, spiral tube pitch, and the presence of baffles. Larger spiral tube diameter leads to lower mass transport. Applications of the results include design of heat exchangers in agitated vessels and membrane equipment for processes like dialysis and ultrafiltration.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Thermodynamics
Guanping Jian, Simin Wang, Jian Wen
Summary: The experimental results suggest that the tube-side heat transfer coefficient of spiral-wound heat exchangers increases with the winding angle, while the overall compactness is influenced by the layer and tube pitch. Friction factors are affected by winding angle and internal turbulence, and tube-side inlet temperature has a slightly negative effect on heat transfer. Correlations between Nusselt number and friction factor have been developed based on the data, with average errors of 8.04% and 6.28% respectively when compared to the experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Parinya Kiatpachai, Thawatchai Kaewkamrop, Mehrdad Mesgarpour, Ho Seon Ahn, Ahmet Selim Dalkilic, Omid Mahian, Somchai Wongwises
Summary: This paper presents the air-side performance of embedded and welded spiral fin and tube heat exchangers. The experiment results show that the fin pitch has no effect on the air-side performance of embedded spiral fin and tube heat exchangers, but it does influence the air-side performance of the welded ones. The embedded spiral fin and tube heat exchanger has a higher heat transfer rate due to better fin base connections, while the pressure drop of the welded spiral fin and tube heat exchanger is greater.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Quanyu Gong, Chulin Yu, Wenqing Wang, Youqiang Wang
Summary: A novel approach to heat exchangers, featuring a continuous spiral baffle structure, was studied and analyzed for its flow field and thermal transfer characteristics. Increasing the entry speed on the shell pass resulted in a drop in fluid temperature, shrinkage of the low-temperature segment, and escalated resistance within the heat exchanger. Additionally, increasing the corrugated height and decreasing the corrugated pitch improved the overall heat transfer performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xudong Duan, Juan Xiao, Aimin Zhou, Simin Wang, Jian Wen
Summary: This paper discusses the flow pattern and forced convection heat transfer of tandem heated cylinders with different distances in the coal chemical industry. A novel spiral wound heat exchanger with variable diameter tubes is proposed. The research results provide guidance for the design of coal water slurry preheaters and the structural optimization of spiral wound tube heat exchangers.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Han-Taw Chen, Ming-Hsun Hsu, Kai-Chen Yang, Kuei-Hao Chang, Kuo-Chi Liu
Summary: This study predicts heat transfer using an inverse CFD method and selects an appropriate flow model through validation tests. The study finds the presence of vortex rings in the low-velocity region of the tubes and the inclination of thermal plumes varies with the diameter. The experimental results agree with theoretical models.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Green & Sustainable Science & Technology
R. Anish, Mahmood Mastani Joybari, Saeid Seddegh, V Mariappan, Fariborz Haghighat, Yanping Yuan
Summary: This study investigated the heat transfer mechanism in a horizontal shell and multi-finned tube heat exchanger through numerical simulation, finding that design parameters such as the number of tubes, fin height, and rotation of fins and tubes significantly affect the storage performance.
Article
Thermodynamics
Xiaoming Dong, Yuting Wu, Cancan Zhang, Yuanwei Lu, Chongfang Ma
Summary: This study experimentally and numerically investigated the flow and heat transfer characteristics of molten salt nanofluids in spiral-wound tubes. The heat transfer correlation and resistance correlation of molten salt nanofluids were obtained through experiments, and the distribution of pressure, temperature, and velocity fields of the nanofluids was explored using a three-dimensional model. These findings are significant for the design of heat exchangers in third-generation solar thermal power systems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Arif Emre Aktas, Muhammet Nasif Kuru, Mehmet Tahir Erdinc, Orhan Aydin, Mehmet Bilgili
Summary: In this study, optimal design parameters of circular, diamond, and enhanced shaped geometries for staggered tube banks were explored using a multi-objective genetic algorithm (MOGA-II). The steady, incompressible, and turbulent flow around three-dimensional numerical models was solved using the finite volume method. The results of the optimization studies showed that the diamond shaped tube bank exhibited a higher heat transfer rate than the circular one for the same given volume (156%). Furthermore, the optimal enhanced shaped geometry showed a 0.59% higher heat transfer rate, 21.73% lower pumping power requirement, and 9.65% lower total tube bank volume than the optimal diamond shaped one.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Saad Aldossary, Anas Sakout, Mouhammad El Hassan
Summary: In this study, the heat transfer enhancement of suspending alumina nanoparticles in a flow between concentric cylinders was investigated using Computational Fluid Dynamics. The results showed that suspending 1% of alumina nanoparticles significantly enhanced heat transfer rates, while higher nanoparticle concentrations had a negligible effect on heat transfer.
Article
Green & Sustainable Science & Technology
Ganesh Ravi Shanker, K. O. Homan
Summary: In this study, multi-dimensional natural convection and mixed convection in a vertical borehole of a ground source heat pump were numerically investigated. It was found that natural convection has a significant impact on heat transfer, while mixed convection induced by groundwater flow depends on the Peclet number. The multi-dimensional mixed convection was shown to be captured between natural and forced convection, with a dimensionless group identified to parameterize the transition between the two limits.
Article
Thermodynamics
Punnoose Abraham, Mostafa H. Sharqawya, M. E. Shawkatb
Summary: An experimental investigation was conducted on the thermal and hydraulic characteristics of a spiral finned-tube heat exchanger, showing that there is little variation in the air-side heat transfer coefficient and Colburn factor for different numbers of rows. The results indicate a consistent performance over the tested Reynolds number range.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Zhaozhi Li, Senlin Wang, Yingjuan Shao, Wenqi Zhong
Summary: This study experimentally investigates the convective heat transfer of supercritical CO2 (sCO2) flowing upward and downward in a 10 mm diameter tube. The effects of heat flux, mass flux, pressure, and flow orientation on heat transfer were examined. The results show that a rising heat flux impairs heat transfer, an increase in mass flux enhances heat transfer, and an increase in pressure harms heat transfer. Downward flow exhibits better heat transfer performance compared to upward flow under the same conditions.
APPLIED THERMAL ENGINEERING
(2023)
Article
Metallurgy & Metallurgical Engineering
M. H. Elzahaby, S. A. Nosier, G. H. Sedahmed, A. S. Fathalla, M. H. Abdel-Aziz, D. A. El-Gayar
Summary: This study investigated the removal of copper from dilute copper sulfate solution by cementation on a horizontal zinc disc impinged by an axial turbulent unsubmerged jet in a recirculating batch reactor. The effect of different parameters such as initial copper ion concentration, solution velocity, nozzle diameter, and the axial distance between the zinc disc and the unsubmerged jet on the rate of copper ion removal was studied. The results showed that the rate of cementation increased with increasing solution velocity and nozzle diameter, while decreasing the axial distance between the zinc disc and the unsubmerged jet.
CANADIAN METALLURGICAL QUARTERLY
(2023)
Article
Chemistry, Multidisciplinary
M. Sh. Zoromba, H. A. Maddah, M. H. Abdel-Aziz, Ahmed F. Al-Hossainy
Summary: In this study, a HCl-doped copolymer of ortho phenylene diamine and meta phenylene diamine was prepared, and microporous structure thin films of hybrid copolymer/ZrO2 nanocomposite were fabricated. The addition of zirconium oxide nanoparticles improved the crystallinity and optical properties of the copolymer. Molecular structure optimization and frequency calculations were performed using computational models, showing good agreement with experimental data. The findings suggest the potential use of hybrid nanocomposite films in polymer solar cell applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Polymer Science
Mohamed Bassyouni, Mohamed Sh Zoromba, Mohamed H. Abdel-Aziz, Ibrahim Mosly
Summary: In this study, nanocellulose extracted from palm leaves was synthesized into nanocellulose/chitosan nanocomposites for the removal of dyes from textile industrial wastewater. The nanocellulose/chitosan microbeads showed high adsorption capacity and were effective in the removal of direct blue 78 dye. This research provides a new platform for dye removal using eco-friendly adsorbents.
Article
Chemistry, Multidisciplinary
M. Almasoudi, Numan Salah, Ahmed Alshahrie, Abdu Saeed, Mutabe Aljaghtham, M. Sh. Zoromba, M. H. Abdel-Aziz, Kunihito Koumoto
Summary: Core shell nanocomposites based on SWCNT/PPy were fabricated and the optimum formula for maximum TE performance was determined. The core shell nanocomposite showed significantly enhanced TE power factor and figure of merit compared to pure PPy. This enhancement was attributed to the good interaction between PPy polymer chains and walls of the SWCNT.
Article
Green & Sustainable Science & Technology
M. A. El-Naggar, D. M. Hassan, T. M. Zewail, A. A. Zaatout, E-S Z. El-Ashtoukhy, I. H. El Azab, M. Sh Zoromba, M. H. Abdel-Aziz, G. H. Sedahmed, A. S. Fathalla
Summary: The presence of high levels of heavy metals in wastewaters poses a serious threat to the environment. This study focuses on recovering copper ions from synthetic wastewater using an expanded aluminum sheet. The results show that the rate of copper cementation increases with factors such as rotational speed, copper ion concentration, temperature, and mesh number of the aluminum sheet. pH has no influence on the rate of cementation. Surfactants were found to reduce the rate of cementation.
JOURNAL OF SUSTAINABLE METALLURGY
(2022)
Article
Engineering, Environmental
Doaa Sayed, Abdulaziz A. Alturki, Hassan Farag, Randa E. Khalifa, Mohamed Helmy Abdel-Aziz
Summary: This study investigates the use of iron powder for the reduction of hexavalent chromium and its ability to efficiently degrade pollutants. The results show that iron powder has the potential to be an inexpensive and easily accessible method for removing hexavalent chromium. The optimal conditions for chromium removal were determined through the investigation of various variables.
JOURNAL OF ECOLOGICAL ENGINEERING
(2022)
Article
Thermodynamics
W. B. Rasslan, M. A. Abdel-Kawi, S. A. Nosier, Wael M. El-Maghlany, M. H. Abdel-Aziz, G. H. Sedahmed, A. S. Fathalla
Summary: This study investigates the mass and heat transfer behavior of a serpentine tube heat exchanger located at the wall of a square stirred tank reactor using the electrochemical technique. The results show that factors such as impeller rotational speed, impeller geometry, tube diameter, and tube pitch affect the mass or heat transfer coefficients. It is also found that the serpentine tube heat exchanger has higher mass transfer rates and can be used as a catalyst support and cooler, reducing the costs of biochemical reactors.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
A. M. Teamah, S. A. Nosier, G. F. Malash, W. M. El-Maghlany, G. H. Sedahmed, M. H. Abdel-Aziz, A. S. Fathalla
Summary: This study used electrochemical technique to investigate the effect of surface corrugations on mass and heat transfer in a stirred tank reactor. The results showed that corrugations can significantly increase the volumetric mass transfer coefficient. The findings are important for determining the heat transfer rate from a corrugated wall to a cooling jacket.
EXPERIMENTAL HEAT TRANSFER
(2022)
Article
Chemistry, Physical
M. S. Mansour, Yousra Farid, S. A. Nosier, Ola Adli, M. H. Abdel-Aziz
Summary: This study investigates the feasibility of using photochemical advanced oxidation as a viable technique to address the ecological issue of persistent organic contaminants. UV/H2O2 and photoelectro-Fenton processes were utilized for the degradation of Eosin Yellow in solution. Various operational variables were examined for both methods to optimize the degradation efficiency.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Environmental Sciences
I. A. Ahmed, S. A. Nosier, G. F. Malash, M. Hussein, M. H. Abdel-Aziz, G. H. Sedahmed, A. S. Fathalla
Summary: Electrocoagulation using an Al helical coil cell was employed to remove brilliant yellow azo dye from wastewater. The coil's external surface served as the anode, while its internal surface acted as a cooler to control temperature. Several variables, including current density, dye concentration, pH, temperature, NaCl concentration, and stirring rate, were studied. Under optimal conditions, a maximum dye removal efficiency of 92% was achieved in 90 minutes, with an energy consumption ranging from 3.258 to 313.3 kW·h/kg.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Polymer Science
M. Sh. Zoromba, M. H. Abdel-Aziz, A. R. Ghazy, N. Salah, A. F. Al-Hossainy
Summary: Conducting poly orthophenylene diamine polymer (PoPDA) was synthesized via oxidative polymerization, and a poly(o-phenylene diamine) (PoPDA)/titanium dioxide nanoparticle mono nanocomposite [PoPDA/TiO2](MNC) was synthesized using the sol-gel method. The physical vapor deposition (PVD) technique was successfully used to deposit the mono nanocomposite thin film with good adhesion and a film thickness of approximately 100±3 nm. The [PoPDA/TiO2](MNC) thin films were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM), and their optical properties were studied using UV-Vis-NIR spectroscopy.
Article
Engineering, Multidisciplinary
M. H. Abdel-Aziz, H. A. Maddah, M. Sh. Zoromba, Ahmed F. Al-Hossainy
Summary: HCl doped-copolymer of ortho phenylene diamine, meta phenylene diamine, and pyrrole terpolymers blend was synthesized and deposited as thin films. The blend exhibited improved optical characteristics and showed potential for application in polymer solar cells. The theoretical and experimental analyses confirmed the structural and optical consistency of the blend.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
A. S. Fathalla, H. M. Yassine, S. A. Nosier, M. H. Abdel-Aziz, G. H. Sedahmed, M. A. El-Naggar
Summary: This study investigates mass and heat transfer rates in turbulent flow serpentine tube heat exchangers/reactors using the copper dissolution technique. The results show the potential of serpentine tubes for economically viable diffusion-controlled reactions and the use of drag-reducing polymers to reduce corrosion rates. The study highlights the applicability of serpentine tubes in catalytic continuous reactors and membrane processes, emphasizing their importance in heat exchanger design and corrosion allowance prediction.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Engineering, Electrical & Electronic
Abdullah Almaghraby, Alaa Attar, Neazar Baghdadi, Mohamed Helmy Abdel-Aziz, Numan Salah, Mohamed Shafick Zoromba
Summary: In this study, polypyrrole/metal hydroxide composites were prepared, and it was found that the presence of metal hydroxides significantly improved the thermoelectric properties of the materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Environmental Sciences
D. G. Bassyouni, M. H. Abdel-Aziz, E-s. z. El-Ashtoukhy, G. H. Sedahmed, I. A. El-Gheriany
Summary: This study investigates the application of electrocoagulation for the removal of cyanide from industrial waste solutions, using a novel cell design and optimization via Response surface methodology. The results demonstrate the high efficiency of cyanide removal, providing valuable insights for industrial wastewater treatment.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Chemical
Andrea Coletto, Pietro Poesio
Summary: Experiments and simulations were conducted to study the air volume fraction and hold-up in a bubble channel reactor. A new signal processing method was proposed to avoid the loss of bubble residence time. The results were in agreement with previous studies and a bubble-scale model was developed to explain the relationship between hold-up and air superficial velocity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2024)
