A model-based technique for the determination of interfacial fluxes in gas–liquid flows in capillaries

2016 ◽  
Vol 1 (3) ◽  
pp. 288-299 ◽  
Author(s):  
Senne Fransen ◽  
Simon Kuhn
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Non Invasive ◽  
Model Based ◽  
Interfacial Mass Transfer ◽  
Invasive Method ◽  
Gas Liquid Flow ◽  
Liquid Flows

A non-invasive method to quantify interfacial mass transfer in gas–liquid flow is presented.

scholarly journals Velocity bias in intrusive gas-liquid flow measurements

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
B. Hohermuth ◽  
M. Kramer ◽  
S. Felder ◽  
D. Valero
Keyword(s):  
Liquid Flow ◽  
Breaking Waves ◽  
Correction Method ◽  
Force Balance ◽  
Bubble Velocity ◽  
Natural Environments ◽  
Flow Measurements ◽  
Gas Liquid Flow ◽  
Liquid Flows ◽  
Velocity Bias

AbstractGas–liquid flows occur in many natural environments such as breaking waves, river rapids and human-made systems, including nuclear reactors and water treatment or conveyance infrastructure. Such two-phase flows are commonly investigated using phase-detection intrusive probes, yielding velocities that are considered to be directly representative of bubble velocities. Using different state-of-the-art instruments and analysis algorithms, we show that bubble–probe interactions lead to an underestimation of the real bubble velocity due to surface tension. To overcome this velocity bias, a correction method is formulated based on a force balance on the bubble. The proposed methodology allows to assess the bubble–probe interaction bias for various types of gas-liquid flows and to recover the undisturbed real bubble velocity. We show that the velocity bias is strong in laboratory scale investigations and therefore may affect the extrapolation of results to full scale. The correction method increases the accuracy of bubble velocity estimations, thereby enabling a deeper understanding of fundamental gas-liquid flow processes.

Gas-liquid flow characterization and mass transfer study in a microreactor for oligomerization catalyst testing

2021 ◽  
pp. 108476
Author(s):  
Mahmoud Kamaleddine ◽  
Dr Charles Bonnin ◽  
Dr Typhène Michel ◽  
Dr Léna Brunet-Errard ◽  
Dr Joëlle Aubin ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Flow Characterization ◽  
Gas Liquid Flow ◽  
Transfer Study

scholarly journals MASS TRANSFER IN A MULTISTAGE VIBRATING DISK COLUMN WITH COCURRENT GAS-LIQUID FLOW

1974 ◽  
Vol 7 (2) ◽  
pp. 126-130 ◽  
Author(s):  
KAKUJI TOJO ◽  
KEI MIYANAMI ◽  
TAKEO YANO
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Gas Liquid Flow

Liquid-solid mass transfer in packed beds with downward concurrent gas-liquid flow

AIChE Journal ◽  
1978 ◽  
Vol 24 (4) ◽  
pp. 709-717 ◽  
Author(s):  
Charles N. Satterfield ◽  
Michael W. Van Eek ◽  
Gary S. Bliss
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Packed Beds ◽  
Solid Mass ◽  
Gas Liquid Flow

Two‐Phase Mass Transfer in Channel Electrolyzers with Gas‐Liquid Flow

1985 ◽  
Vol 132 (3) ◽  
pp. 601-608 ◽  
Author(s):  
Demetre J. Economou ◽  
Richard C. Alkire
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Two Phase ◽  
Gas Liquid Flow

scholarly journals FREQUENCY OF DETERMINATION OF PARENCHYMAL ORGANS DISTURBANCES DURING ULTRASOUND EXAMINATION OF REPRODUCTIVE TRACT

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Strahinja ĆIBIĆ ◽  
Miloš PAVLOVIĆ
Keyword(s):  
Genital Tract ◽  
Reproductive Tract ◽  
Ultrasound Examination ◽  
Non Invasive ◽  
Follicular Cyst ◽  
Pathological Conditions ◽  
Ultrasound Diagnostics ◽  
Liver And Pancreas ◽  
Invasive Method

Ultrasound Real time 2D diagnostics, being an available and non-invasive method, issuccessfully used in human medicine, veterinary medicine and biology to diagnose bothphysiological and pathological conditions. In the case of small animals, the ultrasound is often usedto diagnose gravidity, number, size and vitality of fetuses as well as to diagnose pathologicalconditions present in the genital tract, and is also used to examine testicles and prostate of maleanimals. Today's advanced use of the ultrasound diagnostics provides us with an opportunity todetect numerous pathological conditions of reproductive tract of both female and male animals, andthose conditions directly affect health status of other internal organs. The aim of this study is todiagnose primary genital tract disorders using the ultrasound diagnostics, as well as proving itsconnection to the changes in parenchymal organs. The ultrasound examination was performed onthe total of 12 dogs, 6 male and 6 female dogs. Ovaries, uterus and the organs in the abdominal areawere examined using a transducer ranging from 5 to 8 MHz. A transducer of 7.5 MHz was used toexamine prostates and testicles. The patients were in dorsal position. Three out of six examined maledogs exhibited changes on their prostates, and the remaining one had a tumor on the testicles. Cystitisand hyperplasia of prostate were also found upon the examination of these dogs. One out of sixexamined female dogs, had cystic endometrial hyperplasia, three of them had pyometra, and one ofthem was diagnosed with an follicular cyst. In addition to these pathological conditions, changeswere noticed in the liver and pancreas. Along with the detection of primary changes in the genitaltract of both male and female animals, the ultrasound diagnostics can be used to discover consequentchanges in parenchymal organs.

scholarly journals Visual Scale as a Non-Invasive Method for Evaluation of Risk and Severity of Coronary Atherosclerosis

Kardiologiia ◽  
2021 ◽  
Vol 61 (4) ◽  
pp. 46-52
Author(s):  
M. V. Zhatkina ◽  
N. E. Gavrilova ◽  
V. A. Metelskaya ◽  
E. B. Yarovaya ◽  
B. A. Rudenko ◽  
...  
Keyword(s):  
Coronary Atherosclerosis ◽  
Roc Analysis ◽  
Noninvasive Diagnosis ◽  
Predictive Values ◽  
Non Invasive ◽  
Visual Scale ◽  
Invasive Method ◽  
Ultrasound Parameters ◽  
Qualitative Characteristics

Aim      To evaluate quantitative and qualitative characteristics of atherosclerotic plaques (ASP) in carotid arteries (CA) and femoral arteries (FA) and to use these data for developing a visual scale (VS) for noninvasive diagnosis and determination of severity of coronary atherosclerosis.Material and methods  This study included 216 patients (115 men and 101 women) aged 24 to 87 years (mean age, 61.5±10.73 years). All patients underwent coronary angiography (CAG) for detecting and determining severity of CA atherosclerosis and duplex scanning (DS) for detecting atherosclerosis of CA and FA.Results Analysis of ultrasound parameters of ASP in CA and FA showed that the maximal ASP height, moderate stenosis and maximal stenosis of the arterial bed had higher predictive values than other ultrasound parameters. These parameters were used for forming diagnostic complexes, on the basis of which two individual VSs for CA and FA were developed. Based on the high prognostic value of both scales, they were combined into one that was named VSCOMB. A ROC analysis determined cut-off points of the VSCOMB for diagnosis of CA atherosclerosis of various severity. VSCOMB scores  >4 indicated pronounced CA atherosclerosis with sensitivity of 86.1 % and specificity of 87.5 % whereas VSCOMB scores  ≤4 excluded it. Thus, VSCOMB score 0–1 indicated the absence of CA atherosclerosis; score 2–4 indicated the presence of subclinical CA atherosclerosis; and score >4 indicated severe CA atherosclerosis.Conclusion      A VSCOMB was developed that includes a set of ultrasound parameters for CA and FA and is useful for noninvasive diagnosis of CA atherosclerosis of various severity. Simple and convenient use of VSCOMB allows it to be used at the screening stage to detect subclinical CA atherosclerosis and to prevent its progression. 

scholarly journals Sex determination in gibbons of genus Nomascus using non-invasive method

2016 ◽  
Vol 85 (4) ◽  
pp. 363-366 ◽  
Author(s):  
Petra Bolechová ◽  
Kateřina Ječmínková ◽  
Michal Hradec ◽  
Tomáš Kott ◽  
Jana Doležalová
Keyword(s):  
Sex Determination ◽  
Direct Examination ◽  
Chain Reactions ◽  
Polymerase Chain Reactions ◽  
Non Invasive ◽  
Faecal Samples ◽  
Invasive Method ◽  
Polymerase Chain ◽  
Template Dna

Gibbons of the genus Nomascus have a strong sexual dimorphism and dichromatism. As they mature, both sexes develop sex-specific pelage colour. In combination with physical similarities in the genitalia with both sexes, there are problems with determining the sex of young individuals compared to other genus of gibbons. This is a pilot study applying a multiplex polymerase chain reactions based on a non-invasive method for sex determination of gibbons. The study was conducted on 22 faecal samples from gibbons of the genus Nomascus. The animals were monitored by staff so that the samples were identified correctly and each sample was collected immediately after the defecation. Results confirmed the sex in all adult and juvenile animals with known sex; and 2 females and 5 males in juveniles were determined with unknown sex. The results of direct examination completely corresponded with the PCR results. The PCR reaction with template DNA isolated from faecal material required BSA usage, however, we observed the occurrence of nonspecific fragments. This did not affect the reliability of our results and we confirmed the usability of this method for this genus.

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