Article
Thermodynamics
Zhiming Xu, Xin Jiang, Zuodong Liu, Yinghong Hu, Yanfeng Li
Summary: This study investigates the use of surface modification to inhibit or mitigate microbial fouling deposition on heat exchange surfaces. Experimental results demonstrate that the Ni-P modified surface has excellent fouling inhibition properties, reducing fouling heat resistance by 80% compared to carbon steel. The study also discusses the influencing factors of microbial fouling deposition, such as temperature, flow rate, and microbial concentrations, showing significant impact on fouling resistance.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Rongjuan Sui, Guanghui Zhang, Haiyan Liu
Summary: This research investigates the effects of ultrasonic surface rolling process (USRP) on CaCO3 crystallization fouling in 304 stainless steel (304SS). The modified layer's microstructure, surface morphology, and hydrophobic properties are characterized using optical microscopy, roughness profile measurement, and contact angle measurement. The corrosion and fouling behaviors are studied in simulated cooling water, and electrochemical properties are evaluated using polarization curves and electrochemical impedance spectroscopy (EIS). Results show that USRP-treated surfaces exhibit improved corrosion and fouling resistance due to the weakening of peaks and valleys, reduction of surface defects, and enhancement of corrosion resistance.
Article
Thermodynamics
Atefeh Zarei, M. Reza Malayeri
Summary: Micro heat exchangers with high surface-to-volume ratio are gaining attention for their superior heat transfer performance. However, deposition on their surfaces when subjected to fouling fluids is a major concern. This study experimentally investigates the crystallization fouling of calcium sulfate on micro-structured surfaces during convective heat transfer.
EXPERIMENTAL HEAT TRANSFER
(2023)
Review
Engineering, Chemical
Jure Berce, Matevz Zupancic, Matic Moze, Iztok Golobic
Summary: Fouling on heat exchangers, especially crystallization fouling, remains a significant challenge in heat transfer, despite numerous scientific investigations. Prediction and prevention of fouling are unresolved issues in process engineering, leading to economic losses and environmental damage.
Article
Engineering, Chemical
Yan Wu, Yufei Wang, Ruonan Liu, Xiao Feng
Summary: This study presents a method to optimize velocity distribution and replace heat exchangers to address crude fouling, a long-standing issue in refineries. By establishing a velocity correlation model and utilizing Simulated Annealing, the best solutions are explored and optimized to mitigate fouling effects.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Chemical
Mahshid Nategh, Hojjat Mahdiyar, M. Reza Malayeri, Simon Unz, Michael Beckmann
Summary: The study reveals that the liquid loses solubility with increased nC(7) volume fraction, attributed to the reduction in its electron donor component. In the early stages of nC(7) addition, both asphaltenes exhibit similar resistance to aggregation, but in later stages they tend to have different precipitation propensities.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Thermodynamics
Leilei Dong, B. D. Crittenden, M. Yang
Summary: An experimental study was conducted on fouling characteristics of Water-CaSO4 solutions to heat transfer surfaces, showing that fouling can enhance heat transfer when rotational bulk solution Reynolds number (Re) is high without bulk precipitation. Under surface crystallization (SC) conditions, fouling resistance (R-f) and fouling rate (dR(f)/dt) decrease with increasing Re, while the presence of bulk precipitation (BP) significantly increases fouling rate and alters fouling mechanisms.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
S. Hatte, R. Pitchumani
Summary: The study introduces the novel nonwetting solid-infused surfaces (SIS) with superior anti-fouling characteristics and durability compared to lubricant-infused surface (LIS) and conventional smooth surface. Results show that SIS offers better performance in fouling mitigation and can accurately predict asymptotic fouling resistance through parameter combinations. Additionally, the effects of shear durability on fouling mitigation performance of LIS versus SIS is studied for the first time, demonstrating that SIS provides a robust option for superior fouling mitigation in the long run.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Marian Trafczynski, Mariusz Markowski, Krzysztof Urbaniec
Summary: Heat exchanger fouling can increase the energy intensity of production processes by impairing energy recovery in Heat Exchanger Networks (HENs). Measurement data can be used to monitor fouling growth and schedule exchanger cleaning. This research applies a preferred measurement-aided method to optimize scheduling of cleaning actions in a HEN, with the objective of maximizing avoided operating costs while satisfying timing constraints. A case study using historical operation records demonstrates the economic and energy-saving benefits of the optimization results.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Thermodynamics
M. Esawy, Amir Hossein Nikoo, M. Reza Malayeri
Summary: The superiority of enhanced boiling on structured heat transfer surfaces is due to excessive bubble generation and behavior as well as the latent heat of evaporation. While these factors lead to higher heat transfer coefficients, they also accelerate fouling for aqueous solutions with inverse solubility. The study finds that Turbo-B tubes demonstrate better anti-fouling behavior compared to plain tubes and low finned tubes.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Albin Joseph, Shijo Thomas
Summary: This paper presents an experimental analysis of the fouling factor and thermal performance of a carbon-dot nanofluid on a double-pipe heat exchanger. The study reveals that the flow rate of the fluid has a significant influence on the heat transfer coefficient, while the temperature has less significance on the performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Mohamed S. Selim, Nesreen A. Fatthallah, Shimaa A. Higazy, Zhifeng Hao, Ping Jing Mo
Summary: By controlling the structures and distribution of nanofillers in the silicone matrix, the self-cleaning and antifouling properties of the coatings can be influenced. The PDMS/GO-γ-AlOOH nanorod composite demonstrated better antibacterial activity and lower biodegradability percentage compared to the PDMS/RGO nanocomposite.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Thermodynamics
Mohammed Flyyih Hasan, Merdin Danismaz, Bassim Mohammed Majel
Summary: This study numerically investigates heat transfer enhancement in a double pipe heat exchanger with an extended surface on the inner tube's outer surface and the addition of Alumina nanofluid. Water and hot de-ionized water flow through the annuli at varying mass flow rates and Reynolds numbers, while hot de-ionized water flows through the inner tube. Simulations are conducted with different volume concentrations of Al2O3 nanoparticles. The results show that the use of a finned tube heat exchanger improves heat transfer, with an improvement ratio between 2.3 and 3.1. The convective heat transfer coefficient increases with higher volume concentration and Reynolds number, and a volume concentration of 5% leads to a 20% increase in the heat transfer coefficient and a 4.7% increase in thermal conductivity.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Engineering, Chemical
Dan Zhou, Qinghong Zhang, Yuting Zhu, Zihan Yan, Zhigen Wu
Summary: This paper provides an overview of the hot topic of high-salt wastewater treatment in the environmental protection industry. The need for thermal evaporation under the Zero Liquid Discharge requirement and the importance of dealing with fouling problem in heat exchangers are emphasized. The fouling mechanism is described in detail, along with the introduction of traditional and novel antifouling coatings. The advantages and disadvantages of various antifouling coatings are summarized and analyzed. The aim of this paper is to provide theoretical support for antifouling research in high-salt wastewater heat exchangers.
Article
Thermodynamics
Jure Berce, Matevz Zupancic, Matic Moze, Iztok Golobic
Summary: This study investigated calcium carbonate crystallization fouling in a corrugated plate heat exchanger, and demonstrated the use of temperature and flow measurements, coupled with infrared thermography, to monitor fouling. The results showed that fouling caused channel blockage and flow obstructions, resulting in significant flow redistribution within the channel. This approach provides valuable insights for heat exchanger fouling studies and lays the foundation for future research on dynamic operation and computational models.
APPLIED THERMAL ENGINEERING
(2023)
Article
Environmental Sciences
Meysam Omidvar, Mohammad Reza Malayeri, Farshad Farshchi Tabrizi, Mohammad Mahdi Doroodmand
Summary: Fat, oil, and grease deposits are the main cause of sewer blockage, leading to environmental issues, health hazards, and increased costs for municipalities. This study investigates the impact of used cooking oils on deposit formation and explores the differences in chemical structure and properties between fresh and used oils.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Aliye Mohseni, Leila Mahmoodi, M. Reza Malayeri
Summary: This study firstly predicted the critical mixing ratio of formation water and seawater using PHREEQC at different temperatures. Secondly, it experimentally studied the performance of two green scale inhibitors (folic acid and inulin) to determine their optimum concentration and pH for calcite mitigation. The results showed that the inhibition efficiency of the inhibitors increased with temperature. SEM and TGA analyses were also conducted to understand their inhibition mechanisms and thermal performance.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Thermodynamics
Sadaf Rahimi, S. M. Peyghambarzadeh, H. Kazemi Esfeh, Shima Azizi, M. R. Malayeri
Summary: The research investigated the use of air injection to reduce crystallization fouling. Experiments were conducted in a vertical annular channel under subcooled flow boiling conditions. The results showed that increasing the air injection frequency and fluid temperature effectively reduced fouling resistance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sadaf Rahimi, S. M. Peyghambarzadeh, H. Kazemi Esfeh, Shima Azizi, M. R. Malayeri
Summary: Deposit formation in heat exchangers is an undesirable process that can reduce their performance and efficiency. This research investigated the impact of fluid bulk temperature (Tb) on the deposition of CaCO3 solution under convective heat transfer and subcooled flow boiling conditions. The study found that Tb significantly influenced the mechanism of deposit formation, changing the fouling resistance curve and crystal type of the deposit layer. The results also showed that heat flux and fluid flow rate had different effects on fouling rate depending on Tb and heat flux levels.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Atefeh Zarei, M. Reza Malayeri
Summary: Micro heat exchangers with high surface-to-volume ratio are gaining attention for their superior heat transfer performance. However, deposition on their surfaces when subjected to fouling fluids is a major concern. This study experimentally investigates the crystallization fouling of calcium sulfate on micro-structured surfaces during convective heat transfer.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Thermodynamics
M. Esawy, Amir Hossein Nikoo, M. Reza Malayeri
Summary: The superiority of enhanced boiling on structured heat transfer surfaces is due to excessive bubble generation and behavior as well as the latent heat of evaporation. While these factors lead to higher heat transfer coefficients, they also accelerate fouling for aqueous solutions with inverse solubility. The study finds that Turbo-B tubes demonstrate better anti-fouling behavior compared to plain tubes and low finned tubes.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Ahmad Abbasi, M. Reza Malayeri
Summary: In this study, the relationship between crude oil properties and emulsion stability was investigated using the XDLVO theory. The results indicate that total base number (TBN) and polarity of the crude oil medium can reliably predict emulsion stability. Sensitivity analysis showed that electron acceptor/donor components play an important role in short distances between droplets. Adhesion tests revealed that the presence of HCl solution increases the adhesion of crude oils to glass surfaces.
Article
Engineering, Chemical
Ehsan Jafari, M. Reza Malayeri, Heike Brueckner, Peter Krebs
Summary: This study investigated the effects of various operating parameters on the removal efficiency of turbidity from synthetic wastewater using electrocoagulation-flotation (ECF) with aluminium electrodes. The optimal conditions for achieving 90% turbidity removal were found to be a current density of 0.0028 A/cm2, an initial pH of 7.3, an operating time of 5 min, and a stirring speed of 500 rpm.
MINERALS ENGINEERING
(2023)
Article
Energy & Fuels
A. Sanati, M. R. Malayeri, O. Busse, J. J. Weigand, M. Beckmann
Summary: Chemical injection is an effective method to enhance oil recovery, and this study focuses on the interfacial activity of halogen-free ionic liquid-based catanionic surfactants. The results demonstrate that the synthesized surfactant with medium-chain ionic liquid (n=8) and sodium dodecyl sulfate has higher interfacial activity, lower crude oil-brine interfacial tension, and good wettability alteration. Moreover, the adsorption density of this surfactant onto the dolomite surface is considerably lower compared to the control experiment. The findings suggest that this catanionic surfactant has great potential for future chemical enhanced oil recovery applications.
Article
Chemistry, Physical
Ahmad Abbasi, M. Reza Malayeri, Maysam Mohammadzadeh Shirazi
Summary: Acid stimulation can cause formation damage due to incompatibility between the injected acid and crude oil, resulting in stable emulsions and acid sludge. This study found that crude oil properties, such as TBN, CII, asphaltene to resin ratio, and aromaticity, affect emulsion stability more than the pH value of the spent acid. The interaction between acid and crude oil is closely related to the characteristics of the interfacial film.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Javad Ebrahimi, Behnam Shahsavani, Mojtaba Ghaedi, M. Reza Malayeri, Masoud Riazi
Summary: This study presents a systematic screening approach to evaluate the efficacy of different inhibitors for two crude oils with high asphaltene content. Results show that DBSA is the most efficient inhibitor, but its applicability is limited in cases where both water production and asphaltene deposition occur simultaneously. Additionally, dispersant 110 demonstrates superior dispersion capabilities under low centrifugal force. Overall, dispersant 110 shows the most promising performance in different test methods.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Esmaeil Hedayati, Maysam Mohammadzadeh-Shirazi, Ahmad Abbasi, M. Reza Malayeri
Summary: Improper acidizing design may lead to the formation and stability issues of acid-oil emulsion, hindering fluid flow in reservoirs. This study investigates the impact of operating conditions and crude oil properties on emulsion stability, and finds that it is influenced by mixing speed, temperature, and viscosity.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Multidisciplinary Sciences
Milad Mohammadpour, M. Reza Malayeri, Yousef Kazemzadeh, Masoud Riazi
Summary: This study investigates the formation and stability of emulsions by measuring the colloidal instability index (CII) under ambient and reservoir conditions. The research finds that when CII is greater than 1.059, the formed emulsion is more stable as a result of the excessive instability of asphaltene. However, when CII is below 1.059, the emulsion tends to be less stable. Higher pressures enhance the stability of the emulsion.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Leila Mahmoodi, Amir Hossein Nikoo, M. Reza Malayeri, Masoud Riazi
Summary: This study investigates the most significant removal mechanisms of shear force, rolling, and rebound for asphaltene deposits under field operating conditions. The findings reveal that the removal of asphaltene is controlled by shear force, rolling, and rebound under geological conditions, while the impact of oil properties, casing diameter, and casing material is negligible. Additionally, larger asphaltene particles have a higher possibility of removal. The sticking probability is examined to calculate the proportion of precipitated asphaltene particles that will ultimately attach to the casing surface.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Ehsan Jafari, M. Reza Malayeri, Heike Brueckner, Thomas Weimer, Peter Krebs
Summary: The performance of the electrocoagulation-flotation (ECF) process can be improved by using a new spiral electrode configuration. The new configuration reduces energy consumption and improves removal efficiency of contaminants from industrial wastewater. Enhanced flow hydrodynamics also leads to a reduction in foam formation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(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)
