Article
Thermodynamics
M. Muneeshwaran, Li-Hsiang Wen, Chi-Chuan Wang
Summary: This study investigated a novel fouling mitigation technique using both stationary and rotating twisted tapes. Experimental results showed that an increase in flow rate can reduce fouling resistance within the turbulent flow region. Compared to plain tubes, rotating twisted tapes can significantly reduce fouling resistance, but the pressure drop of fouled tubes remains higher.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Tomas Skoglund
Summary: This study presents a thermodynamically based theoretical analysis of bubble formation on hot heat-exchanger wall surfaces in the context of continuous indirect thermal treatment of milk. The analysis contributes a novel perspective by combining the effects of decreased gas solubility and water evaporation on bubble formation. The derived equations and diagrams offer valuable insights for designing plants to minimize fouling.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Engineering, Environmental
Masoume Ehsani, Ning Zhu, Huu Doan, Ali Lohi, Amira Abdelrasoul
Summary: This research article aims to understand the influence of ultrasound power intensity on microbubbles close to the membrane surface and its application in membrane fouling control. Advanced imaging techniques were used for in-situ analysis and real-time imaging of microbubbles in a membrane filtration unit. The study found that higher ultrasound power intensity resulted in faster bubble growth and improved mass transfer across the membrane, leading to better membrane fouling control.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Construction & Building Technology
Md. Arif Mahmud Shuklo Shoshe, Md. Ashiqur Rahman
Summary: This study numerically analyzes the heat and smoke propagation in informal shopping malls during fire incidents from an evacuation perspective. The effectiveness of air curtains in mitigating the spread of heat and smoke and increasing the safe evacuation time is evaluated. The findings also analyze the impact of optimized clothing arrangement on fire safety.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Environmental
Shafiq M. Hizam, Muhammad Roil Bilad, Nik Abdul Hadi Nordin, Nonni Soraya Sambudi, Mohd Dzul Hakim Wirzal, Norhaniza Yusof, Chalida Klaysom, Juhana Jaafar
Summary: The study focused on fouling control in a forward osmosis system for concentrating produced water by using seawater as a draw solution. Multi-stage concentration with aeration and module inclination showed higher fluxes and concentration factor compared to single-stage concentration. Aeration effectively improved water flux and suppressed fouling, especially when the filtration cell was inclined at a certain angle.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Water Resources
Ehsan Kahrizi, Seyed Ali Akbar Salehi Neyshabouri, Amin Zeynolabedin, Javad Souri, Hassan Akbari
Summary: The objective of this study is to investigate the optimal location of air bubble curtains (ABCs) and airflows for preventing seawater intrusion into rivers. Several tests were conducted with different flow and salinity rates to examine the effect of ABC location on seawater intrusion. The results show that the ratio of saline wedge tip velocity to seawater velocity and the airflow to seawater discharge ratio for the first and second ABCs increase significantly with the ratio of seawater to freshwater densities. Additionally, the closer the ABC is to the river downstream, the higher the airflow rates required to prevent seawater intrusion. Regression equations based on flow properties were derived to predict the parameters of seawater intrusion.
JOURNAL OF WATER AND CLIMATE CHANGE
(2023)
Article
Engineering, Chemical
H. Alnajjar, A. Tabatabai, A. Alpatova, T. Leiknes, N. Ghaffour
Summary: This study explores a new membrane cleaning technique using saturated CO2 solution to alleviate membrane fouling caused by organic matter. The results show that using CO2 technique for cleaning under different concentrations of Ca2+ can improve the efficiency of permeate flux recovery. The observed effect is attributed to the transition from gel layer to looser cake layer which makes CO2 bubble nucleation and subsequent permeate flux recovery more effective.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Food Science & Technology
Tomas Skoglund
Summary: Recent research provides strong evidence that fouling in ultra-high-temperature (UHT) plants for milk is largely impacted by the formation of bubbles on hot heat-exchanger surfaces. The causal relationship between the formation of bubbles and fouling is explained, and the impact of variables such as temperature, pressure, and dissolved air is clarified. The research suggests that by significantly increasing the back pressure, the formation of bubbles can be prevented, thus inhibiting bubble-related fouling. Equations and calculation results for design examples are provided to support the design of plants that suppress or prevent bubble-related fouling.
INTERNATIONAL JOURNAL OF DAIRY TECHNOLOGY
(2023)
Article
Thermodynamics
Jin Ye, Hua Qian, Jianchao Ma, Rong Zhou, Xiaohong Zheng
Summary: The study demonstrates that in hospital consulting wards, increasing supply air velocity and controlling the supply air angle can significantly reduce the mass fraction of exhaled pollutants, thereby improving the isolation performance of air curtains.
BUILDING SIMULATION
(2021)
Article
Construction & Building Technology
Xiaoliang Shao, Xueying Wen, Ryoyong Paek, Yemin Liu, Yiwen Jian, Weiwei Liu
Summary: This study investigated the effect of a recirculated air curtain on transient contaminant transport in a room with diluted ventilation. The results showed that adding a recirculated air curtain significantly reduced pollution in the protected zone, with the optimal discharge air velocity and air intake position affecting the containment effect.
ENERGY AND BUILDINGS
(2022)
Review
Engineering, Environmental
Cheng Cai, Wenjun Sun, Siyuan He, Yuanna Zhang, Xuelin Wang
Summary: Membrane separation is an important drinking water treatment technology with wide applications. Ceramic membranes have remarkable advantages, but membrane fouling limits their effectiveness. This review analyzes the mechanisms of ceramic membrane fouling and evaluates the approaches aimed at controlling it. Optimizing ceramic membrane preparation and combining process regulations with ceramic membranes are important research directions for ceramic membrane-based water treatment.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Physical
Yanqiang Mo, Peihong Xue, Jiqi Xing, Hao Liu, Jiaqi Wang, Juan Liu
Summary: Inspired by the reentrant structure of springtail, researchers have developed a coating with microcavities that use gas-liquid bubbles to prevent biofouling. This bioinspired coating showed excellent resistance to marine bacteria and benthic diatoms in static water conditions, providing a promising solution for static antifouling of vessels and offshore facilities.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Yongqiang Liu, Fang Liu, Miaocheng Weng, Imad Obadi, Pengqiang Geng
Summary: The study aims to predict the optimal smoke curtain depth to prevent smoke spreading, with experimental verification of computational application and analysis of the impact of fire heat release rate and smoke exhaust volume on smoke curtain depth. The expressions of smoke curtain depth were determined based on various plume models.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Marine
Jens Emil Walmsness, Hakon Hagen Helgesen, Stefan Larsen, Giorgio Kwame Minde Kufoalor, Tor Arne Johansen
Summary: This paper proposes and demonstrates an automatic steering system for passenger ferries with dock-to-dock capabilities. The method utilizes a modular control architecture and bumpless transfer transition strategies to allow different controllers for different vessel operational phases. A state machine divides ferry operations into undocking, transit, and docking phases. Simulation results show successful implementation of the method in ferry navigation between docks.
Article
Thermodynamics
Razon Mondal, Juan F. Torres, Graham Hughes, John Pye
Summary: This study investigates the reduction of convection losses in concentrating solar power (CSP) systems by using a planar jet air curtain. The air curtain generates a stagnation zone near the wall, effectively reducing local convective heat losses. The effectiveness of the air curtain depends on parameters such as jet speed, jet angle, plate temperature, and plate inclination.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)