Thermal convection in a cylinder and the problem of planform selection in an internally heated fluid layer

2016 ◽  
Vol 94 (6) ◽  
Author(s):  
V. V. Kolmychkov ◽  
O. V. Shcheritsa ◽  
O. S. Mazhorova
Keyword(s):  
Thermal Convection ◽  
Fluid Layer ◽  
Heated Fluid

Onset of thermal convection in a horizontal fluid layer under ramp heating

2002 ◽  
Author(s):  
Dae Jun Yang ◽  
Jake Kim ◽  
Chang Kyun Choi ◽  
In Gook Hwang
Keyword(s):  
Thermal Convection ◽  
Fluid Layer ◽  
Horizontal Fluid Layer

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.

Correlation Equations for Turbulent Thermal Convection in a Horizontal Fluid Layer Heated Internally and from Below

1978 ◽  
Vol 100 (3) ◽  
pp. 416-422 ◽  
Author(s):  
F. B. Cheung
Keyword(s):  
Boundary Layer ◽  
Thermal Convection ◽  
Fluid Layer ◽  
Lower Surface ◽  
Rate Variation ◽  
Correlation Equations ◽  
Volumetric Heating ◽  
Local Boundary ◽  
Simple Boundary ◽  
Horizontal Fluid Layer

High Rayleigh number thermal convection in a horizontal fluid layer with uniform volumetric energy sources and a constant rate of bottom heating is studied analytically by a simple boundary layer approach. Heat transfer characteristics of the layer are defined in terms of local boundary-layer variables. Correlation equations are derived for the upper and the lower surface Nusselt numbers as functions of two independent Rayleigh numbers, based respectively on the surface to surface temperature difference and the volumetric heating rate. Variation of the turbulent core temperature, which so far has not been determined successfully by existing analytical methods, is obtained. This is found to depend on a single dimensionless parameter which measures the relative rates of internal and external heating. Results of this study are presented with available experimental data.

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