Application of digital Fourier analysis in processing heat-transfer measurements on an oscillating cone in a hypersonic stream

1978 ◽  
Author(s):  
L. JENKE ◽  
W. STRIKE, JR.
Keyword(s):  
Heat Transfer ◽  
Fourier Analysis ◽  
Hypersonic Stream

scholarly journals Fourier analysis of conductive heat transfer for glazed roofing materials

2014 ◽  
Author(s):  
Nurhana Lyana Roslan ◽  
Nurfaradila Bahaman ◽  
Raja Noorliyana Raja Almanan ◽  
Razidah Ismail ◽  
Nor Zaini Zakaria
Keyword(s):  
Heat Transfer ◽  
Fourier Analysis ◽  
Conductive Heat Transfer ◽  
Conductive Heat ◽  
Roofing Materials

Heat-transfer on yawed infinite cylinders in a hypersonic stream

1995 ◽  
Vol 30 (4) ◽  
pp. 518-522
Author(s):  
O. Yu. Apolonskii ◽  
V. A. Bashkin ◽  
M. V. Egorova
Keyword(s):  
Heat Transfer ◽  
Hypersonic Stream

Measurements of heat transfer in separated highenthalpy dissociated laminar hypersonic flow behind a step

1989 ◽  
Vol 199 ◽  
pp. 541-561 ◽  
Author(s):  
S. L. Gai ◽  
N. T. Reynolds ◽  
C. Ross ◽  
J. P. Baird
Keyword(s):  
Heat Transfer ◽  
Fourier Analysis ◽  
Flow Visualization ◽  
Response Surface ◽  
Hypersonic Flow ◽  
Flow Characteristics ◽  
Flow Region ◽  
Transfer Rates ◽  
High Enthalpy ◽  
Phase Map

Measurements of heat transfer in the separated region behind a rearward-facing step in a hypersonic high-enthalpy stream, are described. The range of enthalpies considered was much greater than those reported previously in the literature. High-response surface thermocouples were used to measure the heat-transfer rates. Flow visualization by way of interferograms, with a Mach-Zehnder interferometer, were obtained and improved visualization was further facilitated by digitizing the interferograms and using Fourier analysis to determine fringe positions. This then provided a phase map of the flow region in which the phase was colour coded to emphasize flow characteristics.

The LDE-Type Flare Occurrence (1969-1993)

1994 ◽  
Vol 144 ◽  
pp. 279-282
Author(s):  
A. Antalová
Keyword(s):  
Time Series ◽  
Fourier Analysis ◽  
Sunspot Cycle ◽  
List Type ◽  
Type Number ◽  
Solar Cycles ◽  
Type Iv ◽  
Long Duration ◽  
Cycle Maximum ◽  
Flare Index

AbstractThe occurrence of LDE-type flares in the last three cycles has been investigated. The Fourier analysis spectrum was calculated for the time series of the LDE-type flare occurrence during the 20-th, the 21-st and the rising part of the 22-nd cycle. LDE-type flares (Long Duration Events in SXR) are associated with the interplanetary protons (SEP and STIP as well), energized coronal archs and radio type IV emission. Generally, in all the cycles considered, LDE-type flares mainly originated during a 6-year interval of the respective cycle (2 years before and 4 years after the sunspot cycle maximum). The following significant periodicities were found:• in the 20-th cycle: 1.4, 2.1, 2.9, 4.0, 10.7 and 54.2 of month,• in the 21-st cycle: 1.2, 1.6, 2.8, 4.9, 7.8 and 44.5 of month,• in the 22-nd cycle, till March 1992: 1.4, 1.8, 2.4, 7.2, 8.7, 11.8 and 29.1 of month,• in all interval (1969-1992):a)the longer periodicities: 232.1, 121.1 (the dominant at 10.1 of year), 80.7, 61.9 and 25.6 of month,b)the shorter periodicities: 4.7, 5.0, 6.8, 7.9, 9.1, 15.8 and 20.4 of month.Fourier analysis of the LDE-type flare index (FI) yields significant peaks at 2.3 - 2.9 months and 4.2 - 4.9 months. These short periodicities correspond remarkably in the all three last solar cycles. The larger periodicities are different in respective cycles.

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