Article
Thermodynamics
Qixuan Zhong, Parthiv K. Chandra, Wei Li, Liang Gao, Akhil Garg, Song Lv, K. Tai
Summary: This article focuses on the problem of fluctuating cooling system flow caused by different working states during the operation of electric vehicles. The authors propose a two-dimensional topology optimization method for obtaining cooling plates with different topological structures. The results indicate that the optimized cooling plate structure under low flow conditions has better heat dissipation performance.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Manish Kumar Mohit, Rajesh Gupta
Summary: This paper investigates the thermal and flow characteristics in a microchannel with pin fins through numerical simulation. The results show that heat transfer increases significantly with an increase in fin height and Reynolds number. However, the influence of different fin heights on heat transfer differs after a certain Reynolds number.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Zengkun Zhan, Lixia Chen, Hongna Zhang, Chuandong Lin, Sining Li, Xiaobin Li, Fengchen Li
Summary: This research proposes a new technique for heat transfer enhancement using viscoelastic fluid pulsating laminar flow (VPL flow). Numerical studies and flow performance analysis show that VPL flow significantly improves the overall heat transfer performance, with optimal enhancement achieved at pulsation frequencies close to the characteristic frequency of the viscoelastic fluid flow.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Zengkun Zhan, Menglong Nie, Hongna Zhang, Dongyang Li, Sining Li, Xiaobin Li, Fengchen Li
Summary: Efficient heat dissipation technologies are urgently needed for high heat flux in electronic units. This study proposes a novel heat transfer enhancement technology that combines viscoelasticity and pulsating effects. The effects of parameters on thermal performance of a copper-based rectangular microchannel heat sink are analyzed, and the results show that maximum enhancement in Nu and Re can be achieved by adopting CTAC/NaSal solution driven by pulsating pressure. The technology is applicable and can be optimized in multi-channel heat sinks.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Kelvin Chen, Renato M. Cotta, Carolina P. Naveira-Cotta, Pericles C. Pontes
Summary: This paper analyzes a coupled nonlinear mathematical model for heat transfer in compressible laminar flow within a parallel plates channel. The model is based on the conservation of mass, momentum, and energy, and takes into account viscous dissipation. The model is solved using the Generalized Integral Transform Technique and compared with other numerical and experimental results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Fahad S. Alkasmoul, Mohammed Asaker, Ahmed Almogbel, Ahmed AlSuwailem
Summary: This study evaluates the thermal and hydraulic performance of different nanofluids in a microchannel heat sink and finds that nanofluids can enhance its thermal performance. However, considering the flow rate and pumping power, the use of nanofluids deteriorates the heat dissipation efficiency of the heat sink, resulting in no beneficial aspects in terms of thermal performance and energy cost.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yousef Alihosseini, Mohammad Zabetian Targhi, Mohammad Mahdi Heyhat
Summary: A combination of wavy and oblique grooved microchannel patterns was investigated to improve the performance of microchannel heat sinks. Type-2 showed the best heat transfer performance and pressure drop behavior, with an eta value close to 2.5.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Qifeng Zhu, Yangyang Jin, Junjie Chen, Ruirui Su, Feiyue Zhu, Haixia Li, Jianfeng Wan, Hongwei Zhang, Haolei Sun, Yang Cui, Huixue Xia
Summary: The combination of cavities and ribs significantly affects the performance and efficiency of microchannel heat sink systems. Optimizing the shape and position of ribs is crucial for minimizing pressure drop and maximizing heat removal efficiency. Different shapes and dimensions of ribs have a noticeable impact on the overall system performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Huan-ling Liu, Han-yu Guo, Zhong-liang Xie, Lin Sang
Summary: The novel micro-channel heat sink MSPBPW is studied for its enhanced heat transfer capabilities and reduced maximum substrate temperature. Numerical discussions on the effects of different parameters and optimization through genetic algorithms were conducted to achieve the best performance. Results showed improved heat transfer ability and reduced substrate temperature by introducing perforated baffles and perforated walls in the heat sink design.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Haozhong Hu, Chaomeng Chen, Chao Li, Minqiang Pan
Summary: Roll bond liquid cooling plates (RBLCP) are proposed as a solution to the complex structure, high manufacturing cost, and long manufacturing cycle in server cooling technology. Through experiments, it was found that bending has little effect on the heat transfer performance of RBLCP. The flow characteristics and heat transfer performance of RBLCP are mainly determined by the bending degree of the flow channel. Compared to RBLCP with a Z shape, RBLCP with an N shape has better overall performance. RBLCP has a low cost and can meet the heat dissipation requirements of server chips.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mostafa Fathi, Mohammad Mahdi Heyhat, Mohammad Zabetian Targhi, Sajjad Bigham
Summary: Porous-fin microchannel heat sinks have the potential to improve the thermal and hydraulic performances of microelectronic cooling systems. However, the reduced effective thermal conductivity of porous fins compared to solid fins can negatively impact the thermal performance of the microchannel heat sinks. This research confirms that replacing solid with porous fins can simultaneously enhance the thermal and hydraulic performances of microchannel heat sinks.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Lei Luo, Han Yan, Wei Du, Leyi Hou, Yao Fu, Songtao Wang
Summary: Compared with traditional cylinder holes, trenched holes with rib-disturbed internal flow show better film cooling performance. The interaction between the cooling air and mainstream flow affects the film coverage and effectiveness. Factors such as rib attacking angle, blowing ratio, and surface curvature influence the film cooling performance. Overall, ribs with a 135-degree attacking angle and convex surfaces provide the best adiabatic film cooling effectiveness.
Review
Energy & Fuels
Prabhakar Bhandari, Kamal S. Rawat, Yogesh K. Prajapati, Diwakar Padalia, Lalit Ranakoti, Tej Singh
Summary: Recent advancements in technology have highlighted the importance of micro pin fin heat sinks in dissipating heat flux. This review paper systematically analyzes the different aspects of micro pin fin design and suggests optimal design parameters for single phase fluid flow. Additionally, the study explores the potential of innovative pin fins, such as piranha, open ring, and lattice structures, in achieving effective cooling.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Han Wang, Qing Wu, Chao Wang, Ruzhi Wang
Summary: This study proposes a universal efficient cooling structure based on Micro-Channel Heat Sink (MCHS) that can be used for both uniform and non-uniform heat dissipation of IC chips. The cooling structure significantly reduces the thermal resistance and mean absolute temperature difference, and has broad application prospects.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Ali E. Anqi
Summary: This paper investigates the significance of a serpentine microchannel on the surface of batteries and confirms that the use of nanofluids can increase heat transfer between the microchannel and battery by up to 20%. The study also finds that the Reynolds number is the most effective parameter in improving heat transfer, with an increase from 6.34 to 12.75 when the Reynolds number varies from 25 to 150. Additionally, the use of hydrophobic walls in microchannels leads to a 14.4% enhancement in heat transfer compared to conventional walls.
JOURNAL OF ENERGY STORAGE
(2023)
Letter
Urology & Nephrology
Victoria Fox, Dimitrios Poulikakos
HEMODIALYSIS INTERNATIONAL
(2021)
Article
Urology & Nephrology
Dimitrios Poulikakos, Joanne Martin, Joanne Collier, David Lewis
Summary: U-Drain is a fixed drainage system for automated peritoneal dialysis that connects dialysis effluent outflow directly to the household drainage system, avoiding the use of drain bags. The pilot project showed increased patient satisfaction and an acceptable safety profile for the U-Drain technology.
PERITONEAL DIALYSIS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Hyunchul Park, Iwan Haechler, Gabriel Schnoering, Marco D. Ponte, Thomas M. Schutzius, Dimos Poulikakos
Summary: This study proposes a sustainable atmospheric water harvesting strategy using durable hydrogel sorbents, which operate based on a "ratcheting" mechanism activated by direct sunlight. The strategy improves the daily water productivity and demonstrates great potential to advance the water harvesting capabilities of related systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Kartik Regulagadda, Julia Gerber, Thomas M. Schutzius, Dimos Poulikakos
Summary: This study investigates dynamic ice-elastomer interfacial events and reveals that the ice adhesion strength can vary by orders of magnitude due to the shear velocity. The underlying mechanism is elucidated by studying the detailed deformation fields of the elastomer.
MATERIALS HORIZONS
(2022)
Article
Physics, Applied
M. S. Gerlt, A. Paeckel, A. Pavlic, P. Rohner, D. Poulikakos, J. Dual
Summary: This study presents a method for two-dimensional metal microparticle focusing in a round glass capillary using bulk acoustic waves. By analyzing the change of acoustic streaming patterns, the mechanism for manipulating particles in the low-micrometer range is revealed. The results of this study are of great significance for various applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Abinash Tripathy, Kartik Regulagadda, Cheuk Wing Edmond Lam, Matteo A. Donati, Athanasios Milionis, Chander Shekhar Sharma, Efstratios Mitridis, Thomas M. Schutzius, Dimos Poulikakos
Summary: The perfluorodecanethiol (PFDT) coating has demonstrated superior performance in terms of heat transfer and durability compared to other organic coatings such as perfluorodecyltriethoxysilane (PFDTS) and perfluorodecyl acrylate (PFDA). Despite being a monolayer, the PFDT coating exhibited dropwise condensation for at least 63 hours without deterioration, showcasing its hydrolytic stability. Additionally, the cost of thiol functionalization per area was the lowest among the surface hydrophobic treatments used in the study.
Article
Chemistry, Multidisciplinary
Luca Stendardo, Athanasios Milionis, George Kokkoris, Christos Stamatopoulos, Chander Shekhar Sharma, Raushan Kumar, Matteo Donati, Dimos Poulikakos
Summary: A new surface texture design strategy has been discovered through three-dimensional multiphase computational approach, which can achieve efficient droplet departure and enhance condensation heat-transfer efficiency and water harvesting capabilities.
Article
Nanoscience & Nanotechnology
Iwan Haechler, Nicole Ferru, Gabriel Schnoering, Efstratios Mitridis, Thomas M. Schutzius, Dimos Poulikakos
Summary: Counteracting surface fogging is crucial for eyewear, windows, and displays. An innovative transparent, sunlight-activated, photothermal coating is designed to inhibit fogging. This nanoscopically thin percolating gold layer coating achieves impressive performance in fog prevention and removal, even in cloudy conditions, with improved durability and integration capabilities.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Nafsika Chala, Xinyu Zhang, Tomaso Zambelli, Ziyi Zhang, Teseo Schneider, Daniele Panozzo, Dimos Poulikakos, Aldo Ferrari
Summary: Mechanical signals establish communication between mammalian cells and their environment. Cells exert forces and transmit them at focal adhesion points. External stimuli affect the adhesion-free cell surface. The integration of Fluidic Force Microscopy and confocal Traction Force Microscopy enables precise force probing of individual cells, allowing the investigation of cellular mechanisms in response to mechanical stimuli.
Article
Physics, Multidisciplinary
Henry Lambley, Gustav Graeber, Raphael Vogt, Leon C. C. Gaugler, Enea Baumann, Thomas M. M. Schutzius, Dimos Poulikakos
Summary: Supercooled droplet freezing on surfaces is a common phenomenon in nature and industry, but little is known about its effect on droplet-substrate interactions and the design of icephobic surfaces. This study investigates freezing of supercooled droplets on textured surfaces and identifies surface properties that promote ice expulsion. The study also explores mechanisms through which repellency falters and provides insights into the phenomenology of ice adhesion throughout freezing. The findings contribute to the design of icephobic surfaces for increased safety and sustainability in engineering applications.
Article
Multidisciplinary Sciences
Francesca Michela Pramotton, Lucien Cousin, Tamal Roy, Costanza Giampietro, Marco Cecchini, Cecilia Masciullo, Aldo Ferrari, Dimos Poulikakos
Summary: Mammalian cells respond to topographic cues from a substrate, with anisotropic features giving guidance. However, in the extracellular matrix, the presence of noise affects this guidance effect. This study introduces morphotaxis, a mechanism where fibroblasts and epithelial cells move according to gradients of topographic order distortion.
Article
Chemistry, Multidisciplinary
Panagiotis Sarkiris, Vassilios Constantoudis, Kosmas Ellinas, Cheuk Wing Edmond Lam, Athanasios Milionis, John Anagnostopoulos, Dimos Poulikakos, Evangelos Gogolides
Summary: Micro-nanoengineered superhydrophobic surfaces can enhance heat transfer by inducing the formation of highly mobile condensate droplets. The critical role of the correlation length of topography in designing these surfaces for heat transfer applications is demonstrated. A high correlation length value leads to increased space between surface structures, resulting in improved heat transfer coefficient and delayed flooding of the surface. Therefore, correlation length is a critical criterion for optimizing surfaces for condensation heat transfer.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Michal Muszynski, Jeffrey Okyere, Ruchi Mahindru, Thomas Brunschwiler
Summary: This study aims to develop an end-to-end solution for a patient cough diary, utilizing three convolutional neural networks for multi-class classification, cough validation, and cough event detection. We achieved high accuracy and the experimental results demonstrate that our cough source validation model slightly outperformed the human cohort in the cough memorization task.
2022 IEEE 10TH INTERNATIONAL CONFERENCE ON HEALTHCARE INFORMATICS (ICHI 2022)
(2022)
Article
Nanoscience & Nanotechnology
Sophie C. Lohmann, Abinash Tripathy, Athanasios Milionis, Anja Keller, Dimos Poulikakos
Summary: Driven by the threat of antimicrobial resistance, the design of intrinsically bactericidal surfaces has gained attention. The sizing and flexibility of pillar nanostructures play a crucial role in effective antibacterial functionality.
ACS APPLIED BIO MATERIALS
(2022)
Article
Health Care Sciences & Services
Dario Kohlbrenner, Christian F. Clarenbach, Adam Ivankay, Lukas Zimmerli, Christoph S. Gross, Manuel Kuhn, Thomas Brunschwiler
Summary: This study reports on the user adherence and acceptance as well as the system functionality of a novel multisensory home-monitoring device called CAir-Desk in participants with stable chronic obstructive pulmonary disease (COPD) or asthma. The results show that CAir-Desk exhibited favorable technical performance and was well-accepted by the participants. These insights were used to redesign CAir-Desk for a randomized controlled trial with an interventional program.
JMIR HUMAN FACTORS
(2022)