Experimental Results and Design of Mirror Antenna and MW Gyrotron for Control of High Intermittent Heat Flux in GAMMA 10 Tandem Mirror

2015 ◽  
Vol 68 (1) ◽  
pp. 142-146 ◽  
Author(s):  
R. Minami ◽  
T. Imai ◽  
T. Kariya ◽  
T. Numakura ◽  
T. Kato ◽  
...  
Keyword(s):  
Heat Flux ◽  
Experimental Results ◽  
Tandem Mirror ◽  
Mirror Antenna

scholarly journals Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

2016 ◽  
Author(s):  
R. Minami ◽  
T. Imai ◽  
T. Kariya ◽  
T. Numakura ◽  
K. Tsumura ◽  
...  
Keyword(s):  
Heat Flux ◽  
Tandem Mirror ◽  
Mirror Antenna

Experimental results from a high heat flux solar furnace with a molten metal-cooled receiver SOMMER

Solar Energy ◽  
2021 ◽  
Vol 221 ◽  
pp. 176-184
Author(s):  
F. Müller-Trefzer ◽  
K. Niedermeier ◽  
F. Fellmoser ◽  
J. Flesch ◽  
J. Pacio ◽  
...  
Keyword(s):  
Heat Flux ◽  
Molten Metal ◽  
High Heat ◽  
Experimental Results ◽  
Solar Furnace ◽  
High Heat Flux

scholarly journals Brush seal with thermo-regulating bimetal elements

2018 ◽  
Vol 8 (1) ◽  
pp. 307-313 ◽  
Author(s):  
Michał Stanclik
Keyword(s):  
Heat Flux ◽  
Contact Area ◽  
Heat Load ◽  
Experimental Results ◽  
Frictional Heat ◽  
Brush Seal ◽  
Thermoregulatory Function ◽  
Shaft Surface

Abstract This paper presents a new brush seal construction idea. It was shown that it is possible to use bimetallic elements for the construction of the brush seal, which have a thermoregulatory function by relieving a contact area between bristles and a shaft surface reducing frictional heat flux. This should improve the durability of the seal by diminishing the heat load and significantly decreases the temperature of the seal during the startup/ shutdown. This article shows a simplified construction of the concept brush seal as well as numerical and experimental results.

scholarly journals Heat transfer enhancement during condensation of water steam on inclined pipe

2021 ◽  
Vol 2039 (1) ◽  
pp. 012031
Author(s):  
S Z Sapozhnikov ◽  
V Yu Mityakov ◽  
A V Mityakov ◽  
A Yu Babich ◽  
E R Zainullina
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Enhancement ◽  
Unit Area ◽  
Experimental Results ◽  
Transfer Enhancement ◽  
Water Steam ◽  
Saturated Water ◽  
Informative Content ◽  
Inclined Pipe

Abstract This paper presents experimental study of heat transfer during film condensation of saturated water steam on the outer surface of the inclined pipe by gradient heatmetry. Heat flux per unit area was measured by gradient heat flux sensors made of a single-crystal bismuth. The experimental results are presented in the graphs of heat flux per unit area dependence on time and azimuthal angle. The highest average heat transfer coefficient during condensation of α = 6.94 kW/(m2 • K) was observed when the pipe was inclined at the angle of ψ = 20 °. This value exceeds one obtained on a vertical pipe by 14.9 %. Heat transfer enhancement during condensation of saturated water steam on inclined pipe is associated with changes in condensate film flow. Another part of experiments was made by simultaneously using of gradient heatmetry and condensate flow visualization. Experimental results confirmed the applicability and high informative content of proposed comprehensive method. Comprehensive study of heat transfer during condensation confirmed that heat flux per unit area pulsations may be explained by the formation of individual drops, their coalescence, and drainage from the sensor surface.

Experimental Boiler Tube Burnout as a Function of Downcorner Resistance

1968 ◽  
Vol 12 (01) ◽  
pp. 46-56
Author(s):  
John B. Woodward
Keyword(s):  
Heat Flux ◽  
Heat Fluxes ◽  
Experimental Results ◽  
Boiler Tube ◽  
Average Flow ◽  
Flow Reduction ◽  
Flow Oscillations ◽  
Independent Variable

Experiments to determine the burnout heat flux in a simulated boiler tube are described. The principal independent variable is downcorner resistance to flow, measured by the parameter fL/D, and varied by adjusting a plug cock in the downcorner. The experimental results show an increase in burnout heat flux with increasing downcorner resistance, up to the point at which average flow reduction reverses this trend. The results are explained by the effect of downcorner resistance on the magnitude of flow oscillations, which begin to occur at heat fluxes less than the burnout heat flux, and which tend to promote the onset of burnout.

Study on Infrared Thermal Wave Inspection Technology Using Linear Frequency Modulated (LFM) Light Excitation

2012 ◽  
Vol 542-543 ◽  
pp. 659-662
Author(s):  
Li Qiang Liu ◽  
Jun Yan Liu ◽  
Yang Wang
Keyword(s):  
Heat Flux ◽  
Frequency Modulation ◽  
Thermal Wave ◽  
Steel Sample ◽  
Experimental Results ◽  
Linear Frequency ◽  
Wave Imaging ◽  
Light Excitation ◽  
Modulated Light ◽  
Subsurface Defects

This paper provides the theory, mathematics analysis and experiments in support of the Infrared thermal-wave inspection on the subsurface defects in a solid using linear frequency modulated light excitation (LFMTWI). The specimen is heated by the heat flux of linear frequency modulation for launching thermal-wave into the sample in a desired range of frequency. The more thermal wave responses characters are obtained, and the IR thermal-wave imaging shows much more advantages for subsurface defects detection. The simulation and experimental results from steel sample are presented in support of this technique.

THERMAL CHARACTERISTICS OF FOAMS AND DISCHARGE FROM FIRE-EXTINGUISHMENT FOAM SPRAY NOZZLE

2009 ◽  
Vol 23 (03) ◽  
pp. 381-384
Author(s):  
YOUN-JEA KIM ◽  
JIN-SOO PYO
Keyword(s):  
Heat Flux ◽  
Temperature Gradient ◽  
Thermal Characteristics ◽  
Expansion Ratio ◽  
Experimental Results ◽  
Orifice Diameter ◽  
Spray Nozzle ◽  
Foam Expansion ◽  
Fire Extinguishment ◽  
Air Hole

To evaluate the performance of discharged foam agents used to protect structures from heat and fire damages, the thermal characteristics of fire-extinguishment foams were experimentally investigated. Especially, two different parameters of a spray nozzle, that is, the number of air holes and the orifice diameter, were considered. A simple repeatable test for fire-extinguishment foams subjected to fire radiation was performed. Experimental results showed that the expansion ratio of the discharged foam with the small orifice throat ( d 0= 9.5 mm ) and opened air hole ( N h =9) was large. Results also showed that although the temperature gradient in the foam increased as the foam expansion ratio is increased, it remained constant as the intensity of heat flux increased.

Heatlane Technology for High Heat Flux Chip Cooling

2004 ◽  
Author(s):  
Takahiro Katoh ◽  
Marlin Vogel ◽  
Guoping Xu ◽  
Shlomo Novotny
Keyword(s):  
Heat Flux ◽  
Heat Sink ◽  
High Reliability ◽  
High Heat ◽  
Experimental Results ◽  
High Heat Flux ◽  
Pulsating Heat Pipe ◽  
Fin Efficiency ◽  
Chip Cooling ◽  
Strong Candidate

This paper proposes a new solution for high heat flux chip cooling. The authors attempted to apply Heatlane technology for a heat sink of high-end server chip cooling. This unique technology, which is also called oscillating or pulsating heat pipe, showed very high thermal performance, and the experimental results were compared with conventional copper base heat sink in this paper. The experimental and analysis results showed that the Heatlane technology transferred heat very effectively and highly improved the fin efficiency. And the Heatlane heat sink also showed very small gravity effect and high reliability under vibrating conditions. Those experimental results were also shown in this paper. From this study, the authors has convinced that the Heatlane technology for a heat sink can be a strong candidate to solve a thermal issue of high heat flux chip cooling, especially for high-end server applications.

Numerical Analysis to Predict the Temperature Distribution and Heat Transfer Rate From a Satellite Structure and Experimental Comparison

2012 ◽  
Author(s):  
Daniel T. Schwendtner ◽  
M. Ruhul Amin ◽  
David M. Klumpar
Keyword(s):  
Heat Flux ◽  
Numerical Analysis ◽  
Temperature Increase ◽  
Experimental Results ◽  
Vacuum System ◽  
Experimental Comparison ◽  
Bottom Plate ◽  
Flux Rate ◽  
Thermal Vacuum ◽  
Satellite Structure

Due to their small size and other attractive features, nanosatellites are becoming popular in space applications. Experimental investigation of the thermal behavior of such a satellite can be conducted in a laboratory setup using a thermal vacuum chamber to mimic the conditions of outer space. A small, cost effective thermal vacuum system was desired for performing thermal vacuum testing on nanosatellites. Numerical calculations and laboratory testing were performed as part of the design of this thermal vacuum system. A numerical method using the finite element method was employed to determine the amount of heat flux needed to be applied at the bottom plate of a satellite to achieve a certain rate of temperature increase in the plate. The numerical analysis was performed on a 40.5 kg satellite structure to predict the heat rate per unit area through its bottom surface when it was cycled in the temperature range of −40°C to +80°C with a rate of temperature change from 1°C/min to 5°C/min. A time dependent increase in temperature on the bottom wall was used as a boundary condition. The rest of the satellite walls were assumed to be insulated. Contact resistances between the components of the satellite structure were neglected. Temperature and heat flux distributions on various walls of the satellite were computed and reported in the study. From the numerical results, a maximum heat flux rate of 3,332 W/m2 was calculated on the bottom plate for a temperature increase rate of 1.5°C/min of the plate. A similar experimental setup was tested under similar conditions as a comparison and as a method to validate the thermal system design. Experimental results indicated a heat flux rate of 17,094 W/m2 through a test satellite. The difference between the numerical and experimental results is attributed to geometric differences between the numerical satellite model and the experimental test structure.

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