Radial Heat Flux Profile Measurements in High Enthalpy Plasma Flows Using Calibrated Miniaturized Sensors

2012 ◽  
Author(s):  
Stefan Loehle ◽  
Ulf Fuchs
Keyword(s):  
Heat Flux ◽  
Plasma Flows ◽  
High Enthalpy ◽  
Flux Profile ◽  
Radial Heat ◽  
Miniaturized Sensors ◽  
Radial Heat Flux

scholarly journals RADIATING SPHERICAL COLLAPSE WITH HEAT FLOW

2003 ◽  
Vol 12 (04) ◽  
pp. 667-676 ◽  
Author(s):  
M. GOVENDER ◽  
K. S. GOVINDER ◽  
S. D. MAHARAJ ◽  
R. SHARMA ◽  
S. MUKHERJEE ◽  
...  
Keyword(s):  
Heat Flux ◽  
Simple Model ◽  
Gravitational Collapse ◽  
Temporal Evolution ◽  
Junction Conditions ◽  
X Ray ◽  
Spherical Collapse ◽  
Radial Heat ◽  
Cold Star ◽  
Radial Heat Flux

We present here a simple model of radiative gravitational collapse with radial heat flux which describes qualitatively the stages close to the formation of a superdense cold star. Starting with a static general solution for a cold star, the model can generate solutions for the earlier evolutionary stages. The temporal evolution of the model is specified by solving the junction conditions appropriate for radiating gravitational collapse. The results will be useful in constructing models for the evolution of X-ray pulsars, like Her X-1.

scholarly journals A perturbative approach to the time-dependent Karmarkar condition

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Megandhren Govender ◽  
Wesley Govender ◽  
Kevin P Reddy ◽  
Sunil D Maharaj
Keyword(s):  
Boundary Condition ◽  
Heat Flux ◽  
Gravitational Collapse ◽  
Time Dependent ◽  
Perturbative Approach ◽  
Radial Heat ◽  
Radiating Star ◽  
Static Regime ◽  
Radial Heat Flux ◽  
Static Core

AbstractIn this work we employ a perturbative approach to study the gravitational collapse of a shear-free radiating star. The collapse proceeds from an initial static core satisfying the time-independent Karmarkar condition and degenerates into a quasi-static regime with the generation of energy in the form of a radial heat flux. The time-dependent Karmarkar condition is solved together with the boundary condition to yield the full gravitational behaviour of the star. Our model is subjected to rigorous regularity, causality and stability tests.

The influence of an equation-of-state during radiative collapse

2016 ◽  
Vol 26 (07) ◽  
pp. 1750065 ◽  
Author(s):  
M. Govender ◽  
R. S. Bogadi ◽  
S. D. Maharaj
Keyword(s):  
Heat Flux ◽  
Equation Of State ◽  
State Parameter ◽  
Hydrostatic Equilibrium ◽  
Temperature Profiles ◽  
Equation Of State Parameter ◽  
Radial Heat ◽  
Radiating Star ◽  
Radial Heat Flux ◽  
Radiative Collapse

We study the role played by an equation-of-state during gravitational collapse of a radiating star. Starting from an initially static matter configuration obeying a linear equation-of-state, the star loses hydrostatic equilibrium and undergoes dissipative collapse in the form of a radial heat flux. We show that the equation-of-state parameter plays an important role in determining the temperature profiles of the collapsing body.

scholarly journals Collapse of a Relativistic Self-Gravitating Star with Radial Heat Flux: Impact of Anisotropic Stresses

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Ranjan Sharma ◽  
Shyam Das
Keyword(s):  
Heat Flux ◽  
Simple Model ◽  
Heat Flow ◽  
Spherically Symmetric ◽  
Local Anisotropy ◽  
Evolving Systems ◽  
Radial Heat Flow ◽  
Radial Heat ◽  
Radial Heat Flux ◽  
Collapse Rate

We develop a simple model for a self-gravitating spherically symmetric relativistic star which begins to collapse from an initially static configuration by dissipating energy in the form of radial heat flow. We utilize the model to show how local anisotropy affects the collapse rate and thermal behavior of gravitationally evolving systems.

Investigation of Effect of Burner Diameter on Heat Transfer Characteristics of Methane/Air Flame Impinging on a Flat Surface

2005 ◽  
Author(s):  
Subhash Chander ◽  
Anjan Ray
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Stagnation Point ◽  
Flux Distribution ◽  
Flat Surface ◽  
Heat Flux Distribution ◽  
Heat Transfer Characteristics ◽  
Firing Rates ◽  
Radial Heat ◽  
Radial Heat Flux

An experimental study has been conducted to investigate the effect of burner diameter on heat transfer characteristics of methane/air flames impinging normally to a flat surface. Three different tubes of internal diameter 8 mm, 9.7 mm and 12 mm were selected as flame holders. Effects of firing rates and equivalence ratios were studied on stagnation point and radial heat flux distribution. Three firing rates (0.25 kW, 0.40 kW and 0.50 kW) and three equivalence ratios (0.8, 1.0 and 1.2) were considered. Stagnation point heat flux was compared for different burner diameters under similar conditions. Radial heat flux distributions over the surface for different burner diameters under different firing rates and equivalence ratios were compared. It was found that the heat flux distribution was intimately related to flame shapes and sizes.

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