scholarly journals Numerical study of thermal stress of a silicon mirror forming a beam of synchrotron radiation

2021 ◽  
Vol 2119 (1) ◽  
pp. 012148
Author(s):  
K.A. Finnikov ◽  
V.V. Vinokurov ◽  
A.D. Nikolenko ◽  
Y.V. Zubavichus ◽  
O.A. Kabov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Thermal Stress ◽  
Synchrotron Radiation ◽  
Stressed State ◽  
Thermal Deformation ◽  
Numerical Study ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
Thermally Stressed State

Abstract Numerical simulation of heat transfer in a mirror for focusing a synchrotron radiation beam and its thermally stressed state has been carried out. The choice of the method for cooling the mirror through contact with the water-cooled plates, which provides the specified limitations on thermal deformation, has been substantiated. The modes of heat transfer, implemented under different conditions of heat transfer at the boundary of the mirror with water-cooled plates, are compared.

Numerical Simulation of Gas Flow and Heat Transfer in Cross-Wavy Primary Surface Channel for Microtubine Recuperators

2005 ◽  
Author(s):  
H. X. Liang ◽  
Q. W. Wang ◽  
L. Q. Luo ◽  
Z. P. Feng
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Gas Turbine ◽  
Numerical Study ◽  
High Reliability ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Flow And Heat Transfer ◽  
High Heat Transfer ◽  
The Cross

Three-dimensional numerical simulation was conducted to investigate the flow field and heat transfer performance of the Cross-Wavy Primary Surface (CWPS) recuperators for microturbines. Using high-effective compact recuperators to achieve high thermal efficiency is one of the key techniques in the development of microturbine in recent years. Recuperators need to have minimum volume and weight, high reliability and durability. Most important of all, they need to have high thermal-effectiveness and low pressure-losses so that the gas turbine system can achieve high thermal performances. These requirements have attracted some research efforts in designing and implementing low-cost and compact recuperators for gas turbine engines recently. One of the promising techniques to achieve this goal is the so-called primary surface channels with small hydraulic dimensions. In this paper, we conducted a three-dimensional numerical study of flow and heat transfer for the Cross-Wavy Primary Surface (CWPS) channels with two different geometries. In the CWPS configurations the secondary flow is created by means of curved and interrupted surfaces, which may disturb the thermal boundary layers and thus improve the thermal performances of the channels. To facilitate comparison, we chose the identical hydraulic diameters for the above four CWPS channels. Since our experiments on real recuperators showed that the Reynolds number ranges from 150 to 500 under the operating conditions, we implemented all the simulations under laminar flow situations. By analyzing the correlations of Nusselt numbers and friction factors vs. Reynolds numbers of the four CWPS channels, we found that the CWPS channels have superior and comprehensive thermal performance with high compactness, i.e., high heat transfer area to volume ratio, indicating excellent commercialized application in the compact recuperators.

scholarly journals Numerical study of gas dynamics and heat transfer in matrix channels at various rib angles

2021 ◽  
Vol 2057 (1) ◽  
pp. 012026
Author(s):  
A V Barsukov ◽  
V V Terekhov ◽  
V I Terekhov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Gas Dynamics ◽  
Average Velocity ◽  
Numerical Study ◽  
Reynolds Numbers ◽  
Separation Flow ◽  
Maximum Heat ◽  
Maximum Heat Transfer

Abstract The results of numerical simulation of the separation flow in matrix channels by the RANS method are presented. The simulation is performed at the Reynolds number Re = 12600, determined by the mass-average velocity and the height of the channel. The distribution of the local Nusselt number is obtained for various Reynolds numbers in the range of 5÷15⋅103 and several rib angles. It is shown that the temperature distribution on the surface is highly nonuniform; in particular, the maximum heat transfer value is observed near the upper edge facets, in the vicinity of which the greatest velocity gradient is observed.

CVD diamond films for synchrotron radiation beam monitoring

1999 ◽  
Author(s):  
Sultan B. Dabagov ◽  
Igor I. Vlasov ◽  
Violetta A. Murashova ◽  
Mikhail V. Negodaev ◽  
Victor G. Ralchenko ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
Beam Monitoring

Bonding and electronic states of boron in silicon nanowires characterized by an infrared synchrotron radiation beam

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7246-7251 ◽  
Author(s):  
N. Fukata ◽  
W. Jevasuwan ◽  
Y. Ikemoto ◽  
T. Moriwaki
Keyword(s):  
Synchrotron Radiation ◽  
Excited States ◽  
Silicon Nanowires ◽  
Ground State ◽  
Electronic States ◽  
Electronic Transitions ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
Acceptor Atom ◽  
Ft Ir

The first report of B local vibrational peaks and electronic transitions of a bound hole from the ground state of a B acceptor atom to excited states by means of micro-FT-IR measurements using an IR-SR beam.

A synchrotron radiation beam-position monitor at the Taiwan Light Source

1998 ◽  
Vol 5 (3) ◽  
pp. 621-623 ◽  
Author(s):  
J.-R. Chen ◽  
T. S. Ueng ◽  
G. Y. Hsiung ◽  
T. F. Lin ◽  
C. T. Lee ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Synchrotron Radiation ◽  
Light Source ◽  
Photon Beam ◽  
Synchrotron Radiation Beam ◽  
Beam Position Monitor ◽  
Radiation Beam ◽  
Beam Position ◽  
Radiation Research

A prototype photon-beam-position monitor has been designed, fabricated and tested at the Taiwan Light Source of the Synchrotron Radiation Research Center. Aluminium was chosen as the material of the blade electrodes due to its low atomic number and high thermal conductivity. The resolution of this photon-beam-position monitor was <±1 µm. The sensitivity of the blade electrode has been measured in situ. Results of measurements for bending-magnet light and undulator light with different gaps are described.

Beamline for calibration of transfer standard light sources in the UV and VUV regions

1998 ◽  
Vol 5 (3) ◽  
pp. 759-761 ◽  
Author(s):  
Tatsuya Zama ◽  
Terubumi Saito ◽  
Hideo Onuki
Keyword(s):  
Electron Beam ◽  
Synchrotron Radiation ◽  
Primary Standard ◽  
Orbital Plane ◽  
Magnetic Flux Density ◽  
Light Sources ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
Radiant Intensity ◽  
Transfer Standard

A beamline which serves for calibrating transfer standard light sources (deuterium lamps, excimer lamps, Xe lamps etc.) in the UV and VUV regions is being constructed. The synchrotron radiation from the electron storage ring TERAS (750 MeV) is used as a primary standard of spectral radiant intensity. In order to use synchrotron radiation as a primary standard, the electron beam and synchrotron radiation beam parameters need to be evaluated. Uncertainties of synchrotron radiation flux evaluated by measurements of the magnetic flux density, the position of the electron orbital plane, the electron beam size and the distance from the synchrotron radiation tangent point to the detector system are expected to be about 0.003, 0.01, 0.05 and 0.1%, respectively.

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