The Onset of Double-Diffusive Instability in a Layer with Temperature-Dependent Fluid Properties

2013 ◽  
pp. 41-47
Author(s):  
J. Tanny ◽  
V. A. Gotlib ◽  
A. Tsinober
Keyword(s):  
Temperature Dependent ◽  
Diffusive Instability ◽  
Fluid Properties ◽  
Double Diffusive

Double-diffusive instability in a thin vertical channel

2021 ◽  
Vol 33 (11) ◽  
pp. 114106
Author(s):  
Sierra Legare ◽  
Andrew Grace ◽  
Marek Stastna
Keyword(s):  
Vertical Channel ◽  
Diffusive Instability ◽  
Double Diffusive

A Procedure to Reduce the Effects of Variable Fluid Temperatures in the Flow Direction: Application to the Design of a Rotary Regenerator

1988 ◽  
Author(s):  
Thomas P. Lewandowski ◽  
Tah-Teh Yang
Keyword(s):  
Heat Exchanger ◽  
Analytical Procedure ◽  
Flow Direction ◽  
Operating Conditions ◽  
Single Element ◽  
Temperature Dependent ◽  
Axial Temperature ◽  
Flow Length ◽  
Fluid Properties ◽  
Element Method

The purpose of this paper is to present results of an analytical procedure which accounts for variations in temperature dependent fluid properties in the flow direction of a heat exchanger. The procedure is called the multi-element method and is used in the performance calculations of a rotary regenerator subject to axial temperature variations greater than 2:1. The multi-element method partitions the flow length and evaluates the heat exchanger by combining the performances of each length. The results show graphically the differences between using the multi-element method and a more commonly used single-element method. The differences presented are between the predicted regenerator disk thickness and between the predicted core pressure drop for a variety of operating conditions.

The Effects of Variable Properties on MHD Flow in Finite Ducts

1970 ◽  
Vol 37 (4) ◽  
pp. 954-958 ◽  
Author(s):  
W. J. Thomson ◽  
G. R. Bopp
Keyword(s):  
Numerical Solutions ◽  
Mhd Flow ◽  
Duct Flow ◽  
Variable Properties ◽  
Temperature Dependent ◽  
Constant Property ◽  
Flow Rates ◽  
Friction Factors ◽  
Fluid Properties ◽  
Fluid Parameters

Numerical solutions are obtained of the coupled partial differential equations which describe variable property MHD flow in finite rectangular ducts. The fluid properties are allowed to vary to the extent that electrical conductivity and viscosity are assumed to be temperature-dependent. It is shown that it is not possible to account for fluid property variations in terms of “weighted” fluid parameters such as average Hartmann numbers. Analysis leads to the conclusion that it is the nature of the current distributions in the duct which is important in predicting the behavior of nonisothermal MHD duct flow. It is possible that this conclusion may aid in the evaluation and correlation of experimental data. It is also shown that consideration of variable fluid properties results in friction factors and flow rates which differ from constant property solutions by as much as a factor of two and by 50 percent, even for small variations.

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