Article
Thermodynamics
Saboora Khatoon, Shehryar Ishaque, Man-Hoe Kim
Summary: This paper investigates the thermal performance of the recompression supercritical carbon dioxide power cycle integrated with a direct air-cooled heat exchanger, and emphasizes the importance of effective heat exchanger technology for the deployment of such power cycles in concentrated solar power plants under arid climatic conditions.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Alireza Zendehboudi, Zuliang Ye, Armin Hafner, Trond Andresen, Geir Skaugen
Summary: This paper investigates the heat transfer and pressure drop characteristics of supercritical CO2 in brazed plate heat exchangers, finding that thermal resistance in the CO2 side is the main factor affecting total heat transfer. Increasing CO2 mass flow rate significantly improves heat transfer coefficients, and factors such as water flow rate, CO2 pressure, and buoyancy force also play a role in heat transfer under different operating conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Analytical
Jiawei Jiang, Shiqiang Liang, Xiang Xu, Buze Chen, Zhixuan Shen, Chaohong Guo, Liqi Yu, Shuo Qin
Summary: This paper presents the results of an experimental study on a novel spiral plate mini-channel gas cooler designed for supercritical CO2. The CO2 channel has a circular spiral cross-section while the water channel has an elliptical cross-section spiral channel. The results indicate that increasing the mass flux of CO2 and inlet water temperature can enhance the overall heat transfer coefficient. The study also found that the gas cooler performs better when vertically oriented compared to horizontally oriented, and verified the accuracy of a correlation method using Matlab.
Article
Thermodynamics
Jian Wang, Xin-ping Yan, Bendiks J. Boersma, Ming-jian Lu, Xiaohua Liu
Summary: Printed circuit heat exchangers (PCHE) are proposed to improve heat recovery and energy saving in supercritical CO2 (S-CO2) power cycles. A modified channel PCHE is investigated to enhance the thermal-hydraulic performance. The results show that the inserted straight section reduces pressure loss and improves flow uniformity, leading to a significant improvement in performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jian-Wei Zhao, Rui Zhao, Yong-Le Nian, Wen-Long Cheng
Summary: The varying density of supercritical carbon dioxide affects heat transfer, with the adaptive flow path proving effective in reducing pressure loss. Additionally, flow direction has a significant impact on heat transfer coefficients.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Wannarat Rakpakdee, Suphakorn Tuntarungsri, Mongkol Pornnattawut, Masaaki Motozawa, Mitsuhiro Fukuta, Weerachai Chaiworapuek
Summary: By altering the configuration of the inlet flow channel, the heat transfer and pressure drop of water flow in double vertical coils and a shell heat exchanger were investigated under 28 kHz ultrasound. The position of activated ultrasonic transducers at P1-P9 was examined for its effects. The results showed that modifying the inlet flow configuration from two to four channels enhanced the Nusselt number by 11.6% on the shell side and increased the heat transfer capability by approximately 9% with ultrasonic irradiation.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Saeed Vahidifar, Seyedhadi Banihashemi
Summary: Researchers have conducted numerous studies on active and passive methods to improve thermal performance and increase heat transfer in internal flows. Different geometries and configurations of turbulators have been proposed for optimal performance in heat exchangers. However, there is limited research on turbulators with equal obstruction inside the tube and aerodynamic geometry. This study investigates the effect of stimulating the boundary layer of the internal flow on heat transfer and flow characteristics, using a pipe with ring-shaped turbulators and equal blocking area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Hao Zeng, Junfeng Wang
Summary: The study investigated the heat transfer and flow resistance of different types of Printed Circuit Heat Exchangers (PCHE) under precooling conditions using numerical methods. The results showed that the zigzag channel PCHE had better heat transfer performance compared to the wavy and airfoil fin channels, while the airfoil fin channel had a lower friction factor.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: This paper investigates the flow distribution and thermohydraulic characteristics of printed circuit heat exchanger (PCHE) with different channel configurations. It is found that PCHE with larger flow resistance in the core region shows better flow uniformity and heat transfer performance. A modified manifold with bent fins and airfoil fins is proposed to improve the flow maldistribution of PCHE, reducing the flow non-uniformity by 39.4% to 61.8% and increasing the overall performance by 5% to 8.5% compared to the original manifold.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Peng Xu, Tao Zhou, Zhongguang Fu, Shang Mao, Juan Chen, Yi Jiang
Summary: This study investigated the flow and heat transfer of lead-bismuth eutectic and supercritical carbon dioxide in a double D-type straight channel printed circuit heat exchanger using numerical simulations. The results revealed that the overall heat transfer coefficient was strongly influenced by the mass flux and temperature difference, and reducing the tube diameter and wall thickness improved the overall heat transfer efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Kizuku Kurose, Naoto Watanabe, Kazushi Miyata, Hideo Mori, Yoshinori Hamamoto, Shuichi Umezawa
Summary: A computational fluid dynamics model was developed to predict the cooling heat transfer coefficient and pressure drop of supercritical pressure refrigerants in a chevron-type PHE, with good agreement with experimental results. The model can be applied to existing and new refrigerants, as well as used to optimize the plate shape of chevron-type PHEs. Discussions on flow behavior and heat transfer characteristics of refrigerants in the PHE were based on simulation results.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yecheng Yao, Jing Ding, Yuanyuan Zhang, Weilong Wang, Jianfeng Lu
Summary: This study proposes a novel pillow plate heat exchanger (PPHE) for heat transfer between molten salt (MS) and supercritical carbon dioxide (SCO 2 ), and analyzes its flow and thermal performance numerically. The fluid flow pattern, temperature, and heat transfer coefficient vary periodically due to the presence of convex/concave spots. The heat transfer coefficient of PPHE is significantly influenced by its structures, such as the channel height and spot longitudinal distance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: This study optimized the structural parameters of a zigzag channel in a printed circuit heat exchanger to improve its performance and size. By using the non-dominated sorting genetic algorithm-II and artificial neural network method, the flow and heat transfer performance under different structural parameters can be predicted and optimized effectively.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Haisong Zhang, Jinliang Xu, Xinjie Zhu, Jian Xie, Mingjia Li, Bingguo Zhu
Summary: This paper investigates the relationship between pressure drop and heat transfer in supercritical carbon dioxide (sCO(2)), introducing the concept of pseudo-boiling to characterize the flow and heat transfer in the supercritical domain. Different regimes of heat transfer behavior and pressure drops are identified, with a new correlation for friction factors developed to better predict the results in sCO(2) systems.
APPLIED THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
C. P. Liang, F. Ture, Y. J. Dai, R. Z. Wang, T. S. Ge
Summary: This paper studied a series of condensation experiments on a desiccant coated microchannel heat exchanger under high temperature and high humidity conditions, discussing the dynamic characteristics and parametric effects, finding stable performance of DCMHE under continuous condensation conditions, and proposing an optimal range for inlet air velocity.
ENERGY AND BUILDINGS
(2021)
Review
Green & Sustainable Science & Technology
Nor F. Yah, Ahmed N. Oumer, Mat S. Idris
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2017)
Article
Computer Science, Interdisciplinary Applications
Ummu K. Jamaludin, Fatanah M. Suhaimi, Normy Norfiza Abdul Razak, Azrina Md Ralib, Mohd Basri Mat Nor, Christopher G. Pretty, Luqman Humaidi
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2018)
Review
Green & Sustainable Science & Technology
A. N. Oumer, M. M. Hasan, Aklilu Tesfamichael Baheta, Rizalman Mamat, A. A. Abdullah
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2018)
Article
Engineering, Multidisciplinary
Asma Abu-Samah, Normy Norfiza Abdul Razak, Fatanah Mohamad Suhaimi, Ummu Kulthum Jamaludin, Azrina Md Ralib
Proceedings Paper
Engineering, Electrical & Electronic
A. A. Razak, A. Abu-Samah, N. N. Razak, S. Baharudin, F. M. Suhaimi, U. K. Jamaludin, A. Ralib, M. B. Mat-Nor, C. G. Pretty
PROCEEDINGS OF TENCON 2018 - 2018 IEEE REGION 10 CONFERENCE
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Asma Abu-Samah, Normy Norfiza Abdul Razak, Fatanah Mohamad Suhaimi, Ummu Kulthum Jamaludin, Geoffrey Chase
PROCEEDINGS OF TENCON 2018 - 2018 IEEE REGION 10 CONFERENCE
(2018)
Article
Critical Care Medicine
Wan Fadzlina Wan Muhd Shukeri, Mohd Basri Mat-Nor, Ummu Kulthum Jamaludin, Fatanah Suhaimi, Normy Norafiza Abd Razak, Azrina Md Ralib
INDIAN JOURNAL OF CRITICAL CARE MEDICINE
(2018)
Proceedings Paper
Multidisciplinary Sciences
Ummu K. Jamaludin, Fatanah M. Suhaimi, Normy Norfiza A. Razak, Azrina M. Ralib, Mohd Basri Mat Nor
ADVANCED SCIENCE LETTERS
(2017)
Proceedings Paper
Multidisciplinary Sciences
Fatanah M. Suhaimi, Ummu K. Jamaludin, Normy N. Razak, Azrina M. Ralib, Mohd Basri Mat Nor
ADVANCED SCIENCE LETTERS
(2017)
Proceedings Paper
Automation & Control Systems
Qurratu Aini Aishah Ahmad Fazil, Ummu Kulthum Jamaludin
2017 IEEE 2ND INTERNATIONAL CONFERENCE ON AUTOMATIC CONTROL AND INTELLIGENT SYSTEMS (I2CACIS)
(2017)
Article
Engineering, Mechanical
A. Y. Adam, A. N. Oumer, Azri Alias, M. Ishak, M. M. Noor
INTERNATIONAL JOURNAL OF AUTOMOTIVE AND MECHANICAL ENGINEERING
(2017)
Proceedings Paper
Engineering, Mechanical
N. Nickolas, P. Moorthy, A. N. Oumer, M. Ishak
4TH INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING RESEARCH (ICMER2017)
(2017)
Article
Engineering, Biomedical
Fatanah M. Suhaimi, J. Geoffrey Chase, Christopher G. Pretty, Geoffrey M. Shaw, Normy N. Razak, Ummu K. Jamaludin
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2017)
Proceedings Paper
Engineering, Manufacturing
D. M. Nuruzzaman, N. Kusaseh, S. Basri, A. N. Oumer, Z. Hamedon
2ND INTERNATIONAL MANUFACTURING ENGINEERING CONFERENCE AND 3RD ASIA-PACIFIC CONFERENCE ON MANUFACTURING SYSTEMS (IMEC-APCOMS 2015)
(2016)
Article
Materials Science, Paper & Wood
Jamiluddin Jaafar, Januar P. Siregar, Ahmed N. Oumer, Mohammad Hazim M. Hamdan, Cionita Tezara, Mohd Sapuan Salit
Article
Chemistry, Physical
P. Belmonte, J. M. Garcia-Vargas, J. F. Rodriguez, I. Garrido, M. T. Garcia, M. J. Ramos
Summary: In this study, four polythiourethane films with different types of polyols and isocyanates were synthesized, characterized, and foamed. The results showed that the type of isocyanate greatly influenced the crystallinity and stiffness of the polymers, while the type of polyol modified the FT-IR spectra and the decomposition curve of the material with temperature. Furthermore, the choice of isocyanate also affected the properties of the foams obtained from the polymeric material.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Xutao Zhu, Jianguo Yan, Shouchun Liu, Fengling Zhu
Summary: This study experimentally assessed the hydrodynamic characteristics of supercritical-pressure R134a in a horizontal circular tube. It was found that the hydrodynamic characteristic curve of R134a under supercritical pressure does not have a negative-slope region but a transition region. The transition region becomes more evident with increasing heat flux, while it weakens with increasing pressure and inlet temperature. Moreover, the onset of the transition region shifts in the direction of high mass flow rate with increasing heat flux.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Stefania Mottola, Iolanda De Marco
Summary: In this study, corticosteroids were micronized with cyclodextrin using Supercritical Assisted Atomization (SAA), resulting in spherical micrometric particles with improved dissolution time.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Honghai Liu, Yu Xie, Zhilan Li, Xiaokai Zhang
Summary: This study compared the effects of supercritical carbon dioxide dewatering (SCD) and conventional kiln drying (CKD) at a temperature of 55 degrees C on the dewatering rate, moisture transfer and distribution, shrinkage, and stress characteristics of bamboo strips. The results showed that SCD had a faster dewatering rate and lower shrinkage compared to CKD, but was less effective in reducing drying stress in bamboo.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tahmasb Hatami, Ozan N. Ciftci
Summary: This study fills the gap in previous research by establishing a hierarchy of significance for factors affecting SFE profitability, providing a deeper understanding of how technical and economic factors impact profitability. The findings highlight that the SFE facility becomes profitable when the extractor capacity surpasses 42 L.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tingshan Guo, Chuang He, Zhiyuan Liang, Qinxin Zhao
Summary: The initial oxidation behavior of Fe10Cr and Fe20Cr alloys in supercritical H2O and supercritical CO2 with O2 has been investigated. The results show that O2 has the highest adsorption energy on FeCr alloys and reacts faster than H2O and CO2.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Vikash Chandra Roy, Jin-Seok Park, Ahmed Redwan Haque, Md Sadek Ali, Hee-Jeong Lee, Byung-Soo Chun
Summary: This research aimed to valorize brewery spent grain (BSG) using subcritical water hydrolysis (SWH) modified by six different natural deep eutectic solvents (DES) and determining their bipotentialities. The findings showed that BSG hydrolysates obtained through DES-induced SWH contained high levels of sugars, proteins, flavonoids, phenolic compounds, and essential amino acids. The hydrolysates also demonstrated antimicrobial activities, and the presence of bioactive compounds was confirmed through FT-IR analysis. This comprehensive profiling of bioactive compounds from BSG using DES-mediated SWH can contribute to the efficient valorization of BSG for industrial purposes.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Kailiang Zhang, Hanyu Wang, Tong Liu, Zhu Wang, Lvxing Wang, Ping Fan, Feng Chen, Mingqiang Zhong, Bozhen Wu, Shanqiu Liu, Jintao Yang
Summary: This study investigates the influence of foam cell structure on the electromagnetic interference shielding performance of conductive polymer composite foam. The results suggest that foamed composites exhibit improved EMI shielding performance, and bimodal cell foams have higher electric conductivity but lower EMI shielding compared to uniform cell foams.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Jaromir Valtr, Petr Roztocil, David Dasek, Radek Musalek, Frantisek Lukac, Jakub Klecka, Marek Janata, Mariana Arnoult-Ruzickova, Eva Mistova, Ludek Jelinek, Petr Sajdl, Jan Macak
Summary: This paper focuses on the design of an experimental facility for in-situ electrochemical testing at supercritical water conditions, including the design of the electrode system and surface insulation coating for electrode leads.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Richard Djimasbe, Mikhail A. Varfolomeev, Nailya M. Khasanova, Ameen A. Al-Muntaser, Rustam R. Davletshin, Muneer A. Suwaid, Gazinur Z. Mingazov
Summary: This study confirms the capability of supercritical water to generate active hydrogen that interacts with different fractions in unconventional feedstocks, leading to synthetic oil production during hydrothermal reactions. The findings suggest that a maximum yield of 16.78% can be achieved at a temperature of 380 oC and a reaction time of 1-12 hours.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)