scholarly journals Comparison of different CFD software performances in the case of an incompressible air flow through a straight conical diffuser

2017 ◽  
Vol 21 (suppl. 3) ◽  
pp. 863-874
Author(s):  
Djordje Novkovic ◽  
Jela Burazer ◽  
Aleksandar Cocic
Keyword(s):  
Mathematical Modeling ◽  
Technological Development ◽  
Pulverized Coal ◽  
Thermal Engineering ◽  
Two Phase ◽  
Greenhouse Gases Emissions ◽  
Numerical Studies ◽  
Fluid Jets ◽  
History Of ◽  
Flow Through

Paper gives a review of the most important results of turbulence research achieved by the Laboratory for Thermal Engineering and Energy at the Vinca Insitute of Nuclear Sciences. Paper presents detailed overview of the history of the scientific research provided in the laboratory, from the beginning in the mid-60s to today, pointing out the main reasons initiating the investigations in this field. After the first period, which was mainly devoted to the research of the structure of the turbulence, since the beginning of the 80s, research is mainly oriented to the flows at high temperatures including chemical reactions and to the development and improvement of differential mathematical models as a modern and very efficient tool in the technological development. This research significantly contributed to the development of pulverized coal burners, plasma-chemical reactors, and optimization of pulverized coal fired boilers operating parameters and prediction of the greenhouse gases emissions. Most recent period includes experimental and numerical studies of the coherent structures in turbulent fluid jets, mathematical modeling of various turbulent thermal flow processes including two-phase turbulent flow in the multiphase heat exchangers and mathematical modeling of the atmospheric boundary layer.

scholarly journals Review of the research on the turbulence in the laboratory for thermal engineering and energy

2017 ◽  
Vol 21 (suppl. 3) ◽  
pp. 875-898
Author(s):  
Dejan Cvetinovic ◽  
Predrag Stefanovic ◽  
Vukman Bakic ◽  
Simeon Oka
Keyword(s):  
Mathematical Modeling ◽  
Technological Development ◽  
Pulverized Coal ◽  
Thermal Engineering ◽  
Efficient Tool ◽  
Two Phase ◽  
Greenhouse Gases Emissions ◽  
Numerical Studies ◽  
Fluid Jets ◽  
History Of

Paper gives a review of the most important results of turbulence research achieved by the Laboratory for Thermal Engineering and Energy. Paper presents detailed overview of the history of the scientific research provided in the laboratory, from the beginning in the mid-60s to today, pointing out the main reasons initiating the investigations in this field. After the first period, which was mainly devoted to the research of the structure of the turbulence, since the beginning of the 80s, research is mainly oriented to the flows at high temperatures including chemical reactions and to the development and improvement of differential mathematical models as a modern and very efficient tool in the technological development. This research significantly contributed to the development of pulverized coal burners, plasma-chemical reactors, and optimization of pulverized coal fired boilers operating parameters and prediction of the greenhouse gases emissions. Most recent period includes experimental and numerical studies of the coherent structures in turbulent fluid jets, mathematical modeling of various turbulent thermal flow processes including two-phase turbulent flow in the multiphase heat exchangers and mathematical modeling of the atmospheric boundary layer.

scholarly journals Mathematical Modeling on Two Phase Hepatic Systolic Blood Flow through arteries due to Hepatitis A

2016 ◽  
Vol 12 (05) ◽  
pp. 80-88
Author(s):  
J. P. Singh ◽  
A. K. Agrawal ◽  
V. Upadhyay ◽  
P. N. Pandey
Keyword(s):  
Mathematical Modeling ◽  
Blood Flow ◽  
Hepatitis A ◽  
Two Phase ◽  
Flow Through

scholarly journals Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy: Part A

2019 ◽  
Vol 23 (Suppl. 5) ◽  
pp. 1587-1609
Author(s):  
Branislav Repic ◽  
Predrag Stefanovic ◽  
Srdjan Belosevic ◽  
Nenad Crnomarkovic ◽  
Simeon Oka
Keyword(s):  
Coal Combustion ◽  
Power Plants ◽  
Technological Development ◽  
Pulverized Coal ◽  
Thermal Engineering ◽  
Pulverized Coal Combustion ◽  
Ministry Of Education ◽  
Large Power ◽  
Practical Applications ◽  
Scientific Meetings

The paper presents an overview of the results of the investigations of the processes that take place in pulverized coal combustion boilers and power plants which, in a longer period of time, were realized in the Laboratory for Thermal Engineering and Energy of the "Vinca" Institute of Nuclear Sciences. The presented results were published in numerous studies realized for different users, Ph. D., M. Sc., and specialist thesis, in international and domestic scientific journals and monographs, presented at numerous international and domestic scientific meetings, etc. The main goal of the paper is to chronologically present the results of domestic research that at one time were at an enviable international level, with concrete practical applications for domestic users. This is especially important to contrast the present situation when domestic research in this area is scarce and when the energy sector relies practically only on imported technologies and foreign consultancy. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III42011, Grant no. III42010, Grant no. TR33018 and Grant no. TR33042] <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/TSCI200127032E">10.2298/TSCI200127032E</a><u></b></font>

Experimental and numerical study on gas-solid two-phase flow through regulating valve of pulverized coal flow

2020 ◽  
Vol 155 ◽  
pp. 1-11 ◽  
Author(s):  
Meihua Chen ◽  
Haifeng Lu ◽  
Yong Jin ◽  
Xiaolei Guo ◽  
Xin Gong ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Numerical Study ◽  
Pulverized Coal ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through ◽  
Coal Flow

Pressure Surge During Cryogenic Feedline Chilldown Process

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Gagan Agrawal ◽  
S. Sunil Kumar ◽  
Deepak Kumar Agarwal
Keyword(s):  
Numerical Study ◽  
Rocket Engine ◽  
Inlet Pressure ◽  
Working Fluid ◽  
Flash Evaporation ◽  
Two Phase ◽  
Numerical Studies ◽  
Start Up ◽  
Flow Through ◽  
Pressure Surge

Cryogenic fluid entering a warm feedline absorbs heat and undergoes rapid flash evaporation leading to pressure surges, which can retard the flow inside the feedline. It may have serious repercussion in operation of the rocket engine during start up. Experimental and numerical studies are carried out to examine the effect of inlet pressure and initial feedline temperature on pressure surges. An analytical model using sinda/fluint software is developed to investigate this complex two-phase flow phenomenon including the various boiling regimes that exist during line chilling. The numerical study is carried out considering 1D flow through a cryogenic feedline of 2.47 m long and 0.01 m inner diameter with liquid nitrogen at 77.3 K as working fluid. Predictions are made for the inlet pressure in the range of 0.28–0.76 MPa and initial wall temperature of 200 K and 300 K. Subsequently, an experimental test rig is setup and the model is validated with the experimental data. The studies show that within the range of parameter considered, the magnitude of pressure surge increases exponentially with increase in inlet pressure and decreases with the prechilling of feedline.

Pressure Drop for Oil-Gas Two-Phase Flow Through Straight Horizontal Pipe

2007 ◽  
Author(s):  
Wenhong Liu ◽  
Liejin Guo ◽  
Ximin Zhang ◽  
Kai Lin ◽  
Long Yang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Flow Through ◽  
Oil Gas

A Novel Secure and Robust encryption scheme for medical images

2020 ◽  
Vol 16 ◽  
Author(s):  
Siyamol Chirakkarottu ◽  
Sheena Mathew
Keyword(s):  
Medical Images ◽  
Technological Development ◽  
Imaging Techniques ◽  
Chaotic Map ◽  
Two Phase ◽  
Positron Emission ◽  
Medical Diagnostic ◽  
Wireless Medium ◽  
Health Care Applications ◽  
Magnetic Resonance Imaging Mri

Background: Medical imaging encloses different imaging techniques and processes to image the human body for medical diagnostic and treatment purposes. Hence it plays an important role to improve public health. The technological development in biomedical imaging specifically in X-ray, Computed Tomography (CT), nuclear ultrasound including Positron Emission Tomography (PET), optical and Magnetic Resonance Imaging (MRI) can provide valuable information unique to a person. Objective: In health care applications, the images are needed to be exchanged mostly over wireless medium. The diagnostic images with confidential information of a patient need to be protected from unauthorized access during transmission. In this paper, a novel encryption method is proposed to improve the security and integrity of medical images. Methods: Chaotic map along with DNA cryptography is used for encryption. The proposed method describes a two phase encryption of medical images. Results: Performance of the proposed method is also tested by various analysis metrics. Robustness of the method against different noises and attacks is analyzed. Conclusion: The results show that the method is efficient and well suitable to medical images.

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