Article
Thermodynamics
Zhengyang Dong, Kai Liu, Mingjun Wang, Ji Zhang, Jing Zhang, Wenxi Tian, Suizheng Qiu
Summary: In this paper, a corrosion product deposition prediction and heat transfer model based on sub-channel analysis is proposed, which is integrated into the nuclear reactor core thermal-hydraulic characteristics analysis code CorTAF developed on the OpenFOAM platform to achieve corrosion deposition and heat transfer calculation for the entire reactor. A numerical simulation of deposition and heat transfer in the AP1000 reactor core during a 300-day operation is conducted, revealing the distribution of corrosion products and the temperature changes of the fuel cladding. The modeling method successfully obtains the corrosion deposition and heat transfer characteristics of the entire reactor core and has potential implications for the prediction of corrosion deposition distribution and thermal effect calculations in other large-scale heat exchange equipment.
APPLIED THERMAL ENGINEERING
(2023)
Letter
Medicine, General & Internal
John O. Fleming, Kolar Murthy
Summary: The Perspective article by Howell failed to acknowledge the significant contributions of William H. Oldendorf, a neurologist and member of the Institute of Electrical and Electronics Engineers, to the development of computed tomographic scanning. Oldendorf, who was the first neurologist elected to the National Academy of Sciences, created the first known prototype apparatus for CT in 1961, leading to a more direct and humane way of imaging the brain.
NEW ENGLAND JOURNAL OF MEDICINE
(2021)
Article
Thermodynamics
Chenglei Xiong, Yongchang Chen, Chongfang Ma
Summary: A prediction model for crystallization fouling was proposed based on the Kern-Seaton model. The model can predict the changes in fouling resistance during the fouling process and is applicable to actual industrial processes, especially for turbulent flow. It provides a more convenient way to predict fouling in heat exchangers without requiring a large amount of measured data for fitting.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Honggang Xing, Haozhe Jin, Xiaofei Liu, Rui Li, Mingxiang Wang, Hengyang Xiang, Chao Wang
Summary: This paper experimentally studies the heat transfer characteristics of heat exchange tubes with NH4Cl crystallization fouling. The results show that the local heat transfer coefficient varies with the circumferential angle and increases with fouling.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Yuchen Wang, Zuodong Liu, Wei Feng, Teng Zhang, Weiwei Xing
Summary: In this study, a novel Ni-P-TiO2 composite coating was successfully prepared on 316 stainless steel surface using electroless plating. The fouling inhibition characteristics of the composite coating were investigated and compared with stainless steel. Experimental results showed that the fouling thermal resistance of the composite coating was significantly lower, indicating its effectiveness in inhibiting fouling deposition. The coating demonstrated lasting and efficient fouling inhibition, making it a potential solution for heat exchange equipment.
Review
Green & Sustainable Science & Technology
Congcong Wu, Haitao Yang, Xiaohei He, Chaoquan Hu, Le Yang, Hongtao Li
Summary: This paper briefly introduces the principle and practical application of fluidized bed heat exchange technology (FBHET), focusing on the research progress of heat transfer, anti-fouling, and flow characteristics of fluidized bed. Innovative suggestions on the development direction and application field of FBHET are proposed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Chemical
Kaleemullah Shaikh, Salim Newaz Kazi, Mohd Nashrul Mohd Zubir, Bushroa Abd Razak, Kokhoe Wong, Yew Hoong Wong, Wajahat Ahmed Khan, Shekh Abdullah, Md Shadab Alam
Summary: This study investigated the heat transfer and mitigation of CaCO3 fouling by applying zirconium coating layer on the heat exchanger surface. The results showed that the zirconium coated surface reduced fouling deposition and improved heat transfer.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(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
Physics, Multidisciplinary
Yaxuan Peng, Xuefei Xu, Yandong Liang
Summary: This study investigated the influence of an axial-electromagnetic field treatment device (AEFTD) with different electromagnetic frequencies on calcium carbonate (CaCO3) crystallization fouling on the tube side of a shell-and-tube heat exchanger. The results showed that the AEFTD effectively reduced fouling resistance and slowed down the growth rate of CaCO3 fouling. The application of the AEFTD enhanced heat transfer and favored the formation of vaterite instead of calcite, which facilitated the removal of fouling by turbulent flow.
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
Energy & Fuels
Slawomir Alabrudzinski, Mariusz Markowski
Summary: This study introduces a new thermal separation technology which reduces energy consumption by 40%-60% by minimizing the number of reboilers and condensers, facilitating continuous heat distribution. Numerical calculations on channel-based heat and mass exchangers show negligible sensitivity to fouling and minimal impact on the purity of collected fractions.
Article
Energy & Fuels
Slawomir Alabrudzinski, Mariusz Markowski
Summary: This article introduces a new method of thermal separation in a channel system, which reduces energy consumption by minimizing the number of reboilers and condensers and minimizing wasted heat flow. Through numerical calculations and simulation studies, the results show that the channel-type heat and mass exchanger has low sensitivity to fouling and the purity of the distillate is hardly affected.
Article
Energy & Fuels
Song-Zhen Tang, Ya-Ling He, Fei-Long Wang, Qin-Xin Zhao, Yang Yu
Summary: This study investigated fouling and heat transfer characteristics in cross flow heat exchangers under dusty conditions, finding that honeycomb H-type finned tube bundles have the lowest fouling thermal resistance and are suitable for waste heat utilization.
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
Engineering, Chemical
V. V. Banakar, P. R. Gogate, A. Raha, Saurabh
Summary: The application of ultrasound to a heat exchanger handling supersaturated solution of CaSO4 was studied to reduce scale formation and clean the exchanger in-situ. A lab-scale double pipe heat exchanger with 6 transducers of 33 kHz was used to investigate the effect of process and ultrasonic parameters. The results showed that applying ultrasound for 10 minutes at 200 W power every 4 hours resulted in a reduction in average fouling resistance by 36.82%, 42.87%, and 43.74% at flow rates of 150 ml/min, 300 ml/min, and 600 ml/min, respectively. The precipitation of salts in the bulk increased by 1.4 to 2.6 times under these conditions, confirming the intensification. SEM analysis revealed that the formed scale was dominated by platelets and needle-like CaSO4 crystals. The application of ultrasound on the heat exchanger surface was found to be an effective approach for intensified heat transfer.
CHEMICAL ENGINEERING SCIENCE
(2023)