Article
Thermodynamics
Hangfei Dong, Chaehyuk Im, Chiho Kang, Jee-Hyun Cho, Ilhoon Jang, Simon Song
Summary: This study investigates the flow behavior in a refrigerator machine room using MRV to improve energy efficiency and reduce flow noise. Results show non-uniform flow distribution and high TKE regions in the reference model. Proposed improvements in the machine room geometry increased mean flowrate and reduced TKE regions, potentially improving energy efficiency and reducing turbulence-induced noise. The effectiveness of MRV in analyzing complex 3D geometry like refrigerator machine rooms is demonstrated, and the proposed improvements were validated using MRV and electromagnetic flowmeter.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
D. Cabut, M. Michard, S. Simoens, L. Mees, V. Todoroff, C. Hermange, Y. Le Chenadec
Summary: Researchers performed local velocity measurements of water flow inside tire grooves of a real car rolling through a water puddle to better understand the hydroplaning phenomenon. They highlighted the presence of bubble columns inside the grooves and proposed a predictive model to support the analysis.
Article
Biology
S. J. Hennige, A. I. Larsson, C. Orejas, A. Gori, L. H. De Clippele, Y. C. Lee, G. Jimeno, K. Georgoulas, N. A. Kamenos, J. M. Roberts
Summary: The occurrence and proliferation of reef-forming corals are essential for biodiversity and ecosystem services. Understanding the ratio of live : dead coral through the 'Goldilocks Principle' can help model coral growth and stability, showing how corals optimize their habitat through engineering. By utilizing particle imaging velocimetry and numerical modelling, we can investigate the future of coral reef structures and the biodiversity they support.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Thermodynamics
Shohei Yamamoto, Akira Murata, Katsumi Oho, Chihiro Hayakawa, Shumpei Hayakawa, Kaoru Iwamoto
Summary: This study aims to clarify the effects of film-cooling flow pulsation and the differences between Strouhal number ratios of 1.0 and root 2, by measuring the velocity fields and seeking reasons for changes. The results show that different pulsation frequencies have varying impacts on film cooling effectiveness, with significant differences in turbulent mixing and shear stresses.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Chemical
Philip Kemper, Ekkehard Kuestermann, Wolfgang Dreher, Thorben Helmers, Ulrich Miessner, Benjamin Besser, Jorg Thoeming
Summary: Multiphase flows play a crucial role in industrial processes, with product selectivity depending on the hydrodynamics within the wake behind bubbles. MRI offers a non-invasive method for investigating multiphase flows, as demonstrated in an experimental setup generating buoyancy-driven N-2 Taylor bubbles in a countercurrent flow of water. Qualitative comparison of MRI results with PIV images from the same setup provides insight into the flow field.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Clinical Neurology
Markus Fahlstrom, Johan Wikstrom, Ljubisa Borota, Per Enblad, Anders Lewen
Summary: Studies using multiple time points for CBF measurements post-ACZ challenge in patients with MMD show significant individual variations in CVR, with the maximum CBF increase typically occurring at 5 minutes post-injection but also seen at 15 or 25 minutes.
FRONTIERS IN NEUROLOGY
(2021)
Article
Engineering, Chemical
Dongjae Kim, Jungwon Park, Jaewook Nam
Summary: The study focused on visualizing the flow using a new velocimetry method based on image processing and deducing a slip parameter by comparing experiments and computations.Various flow rates were computationally explored based on the model to investigate slip behavior.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Ian E. Gunady, Pedro M. Milani, Andrew J. Banko, Christopher J. Elkins, John K. Eaton
Summary: The 3D velocity and scalar concentration fields of a laidback fan-shaped film cooling hole were measured using MRV and MRC, and compared with data obtained using LES. Flow separation was observed inside the hole in both LES and MRV. Despite some disagreements in the results, there was good agreement in the velocity and scalar concentration fields throughout the 3D domain.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2021)
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Thermodynamics
Junil Ryu, Junkyu Kim, Jonghyeok Park, Hyoungsoo Kim
Summary: The study demonstrates that the internal flow pattern inside a sessile droplet can be controlled by adjusting the position and number of volatile liquid sources. The theoretical model based on Stokes flow predicts the primary flow structures of the experimental results. The main conditions determining the internal flow include the distribution of vapor molecules and surface tension values depending on the concentration of the volatile liquid.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Feryal Guerroudj, Laoues Guendouz, Rainier Hreiz, Jean-Marc Commenge, Jeremy Bianchin, Christophe Morlot, Tien Dung Le, Jean-Christophe Perrin
Summary: 3D velocity field measurements in an arrow-type micromixer were conducted using NMR imaging methods. A specific device was set up, including a custom radiofrequency milli-coil matching the geometry of the micromixer, which improved the signal-to-noise ratio by a factor of 7 compared to standard commercial hardware. The NMR images were compared to CFD simulations, showing excellent agreement and demonstrating the capability of the developed method to accurately study phenomena in microstructured systems and the significant impact of small manufacturing defects on hydrodynamics and mixing performances in micromixers.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Environmental Sciences
James E. Fifer, Vy Bui, Justin T. Berg, Nicola Kriefall, Courtney Klepac, Bastian Bentlage, Sarah W. Davies
Summary: Sedimentation can impact the microbiome of corals by altering light availability, triggering stress response, and serving as a reservoir for bacteria and algae. Sediment plays a role in structuring bacterial communities at the colony scale, with edge communities resembling sediment more closely. Center samples are dominated by Endozoicomonas, suggesting its role in structuring bacterial communities and limiting diversity in coral colonies.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Rebecca R. Baker, Christopher Payne, Yichao Yu, Matin Mohseni, John J. Connell, Fangyu Lin, Ian F. Harrison, Paul Southern, Umesh S. Rudrapatna, Daniel J. Stuckey, Tammy L. Kalber, Bernard Siow, Lewis Thorne, Shonit Punwani, Derek K. Jones, Mark Emberton, Quentin A. Pankhurst, Mark F. Lythgoe
Summary: Magnetic resonance navigation is an emergent technique that allows for remote control of magnetically labeled therapies and devices using an MRI system. The MINIMA technique, a novel MRI-guided ablation technique, has the potential to avoid traditional toxicities and offers precise control over the ablation volume.
Article
Engineering, Chemical
Bin Yan, Nicholas W. Bristow, Sarah J. Vogt, Johannes S. Vrouwenvelder, Michael L. Johns, Einar O. Fridjonsson
Summary: In this study, benchtop MRI was used to provide quantitative structural and velocity images of an UF membrane module, revealing the flow velocity inside each individual fiber. It was found that specific fibers were heavily fouled and not effectively cleaned, impacting the overall performance of the module. This research demonstrates the potential of benchtop MRI for further studies on design, manufacturing, and fouling control of hollow fiber UF modules.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Computer Science, Interdisciplinary Applications
Sean M. Rothenberger, Neal M. Patel, Jiacheng Zhang, Susanne Schnell, Bruce A. Craig, Sameer A. Ansari, Michael Markl, Pavlos P. Vlachos, Vitaliy L. Rayz
Summary: We propose an automatic segmentation method for 4D flow MRI based on SDM velocity. The SDM velocity quantifies the net flow effects in each voxel, and vessel segmentation is performed using an F-test. We compare the SDM algorithm with PCD and CNN segmentation methods, and the results demonstrate its robustness and accuracy in identifying vessel surfaces.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2023)
