Stability of a microwave heated fluid Layer

1998 ◽  
Vol 60 (1) ◽  
pp. 73-89 ◽  
Author(s):  
J Gilchrist
Keyword(s):  
Fluid Layer ◽  
Heated Fluid

An Application of the Optical Correlation Computer to the Detection of the Malkus Transitions in Free Convection

1982 ◽  
Vol 104 (2) ◽  
pp. 255-263 ◽  
Author(s):  
E. F. C. Somerscales ◽  
H. B. Parsapour
Keyword(s):  
Heat Transfer ◽  
Quantitative Analysis ◽  
Free Convection ◽  
Optical Method ◽  
Fluid Layer ◽  
Flow Patterns ◽  
Optical Correlation ◽  
Scale Size ◽  
Heated Fluid ◽  
Rayleigh Numbers

This paper presents the results of an investigation concerned with measurements of the scale-size of the flow patterns near the so-called Malkus transitions. The flow patterns in a heated fluid layer were photographed at various Rayleigh numbers and these photographs subjected to quantitative analysis using an optical correlation computer. The results showed that the method provides a very sensitive technique for locating the transitions. Transitions reported by other investigators have been confirmed for Rayleigh numbers between 5.0 × 103 and 1.0 × 106, and an additional, previously unobserved, transition has been detected. Heat-transfer measurements were also made. This data demonstrated the limitations, compared to the optical method, of this approach to the detection of transitions.

Effective Thermal Conductivity for Combined Radiation and Free Convection in an Optically Thick Heated Fluid Layer

1981 ◽  
Vol 103 (1) ◽  
pp. 114-120 ◽  
Author(s):  
M. Epstein ◽  
F. B. Cheung ◽  
T. C. Chawla ◽  
G. M. Hauser
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Free Convection ◽  
Effective Thermal Conductivity ◽  
Radiative Heat ◽  
Fluid Layer ◽  
Convection Heat Transfer ◽  
Turbulent Heat ◽  
Free Convection Heat ◽  
Heated Fluid

The effective thermal conductivity for radiative heat transfer within an optically thick fluid layer undergoing high Rayleigh number convection is derived. This result is combined with available “pure” free-convection heat-transfer correlations to obtain closed-form analytical descriptions of the gross properties of a radiating fluid layer heated internally or from below. These simple solutions compare favorably with recent work in which the governing energy equation incorporating both turbulent heat transport and thermal radiation is solved numerically.

Effect of quasiperiodic gravitational modulation on the stability of a heated fluid layer

2007 ◽  
Vol 76 (5) ◽  
Author(s):  
Taoufik Boulal ◽  
Saïd Aniss ◽  
Mohamed Belhaq ◽  
Richard Rand
Keyword(s):  
Fluid Layer ◽  
Heated Fluid ◽  
The Stability

Three Dimensional Reconstruction From Limited Projection Data Using a Novel MART Algorithm

1999 ◽  
Author(s):  
Debasish Mishra ◽  
K. Muralidhar ◽  
P. Munshi
Keyword(s):  
Fluid Layer ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Projection Data ◽  
Three Dimensional Reconstruction ◽  
Time Requirement ◽  
Dimensional Reconstruction ◽  
Heated Fluid ◽  
Relaxation Factors

Abstract The present work is concerned with the development of a robust three dimensional reconstruction algorithm for applications involving tomography. In an earlier study it was shown that among the ART family of algorithms the multiplicative algebraic reconstruction algorithm (MART) was the most appropriate for tomographic reconstruction. In the present work, the MART algorithm has been extended so that (a) its performance is acceptable over a wider range of relaxation factors, (b) the time requirement for convergence to a solution is lower and (c) its performance is less sensitive to noise in the projection data. Two applications have been considered for evaluating the proposed algorithms namely a circular region with holes and experimental data recorded in a differentially heated fluid layer using an interferometer. The algorithms proposed are seen to be clearly an improvement over those presently available.

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