Measurements and modeling of two-phase flow in microchannels with nearly constant heat flux boundary conditions

2002 ◽  
Vol 11 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Lian Zhang ◽  
Jae-Mo Koo ◽  
Linan Jiang ◽  
M. Asheghi ◽  
K.E. Goodson ◽  
...  
Keyword(s):  
Heat Flux ◽  
Boundary Conditions ◽  
Two Phase Flow ◽  
Constant Heat Flux ◽  
Phase Flow ◽  
Constant Heat ◽  
Two Phase ◽  
Flux Boundary Conditions

Variations of Buoyancy-Induced Mass Flux From Single-Phase to Two-Phase Flow in a Vertical Porous Tube With Constant Heat Flux

1999 ◽  
Vol 121 (3) ◽  
pp. 646-652 ◽  
Author(s):  
T. S. Zhao ◽  
Q. Liao ◽  
P. Cheng
Keyword(s):  
Heat Flux ◽  
Mass Flux ◽  
Single Phase ◽  
Two Phase Flow ◽  
Constant Heat Flux ◽  
Heat Fluxes ◽  
Phase Flow ◽  
Constant Heat ◽  
Two Phase ◽  
Porous Tube

This paper presents an experimental study of a buoyancy-induced flow of water with phase-change heat transfer in a vertical porous tube heated at a constant heat flux. Experiments were carried out from subcooled liquid flow to connective boiling by varying the imposed heat fluxes. At a prescribed heat flux the steady-state mass flux of water, as well as the temperatures along the tube wall and along the centerline of the packed tube, were measured. It is shown that for both single-phase flow and the two-phase flow with a rather low vapor fraction, the induced mass flux increased as the heat flux was increased. However, as the imposed heat flux was increased further, the induced mass flux dropped drastically, and remained relatively constant afterwards. The influences of various parameters such as the porous tube diameter, the particle sizes, and the hydrostatic head on the induced mass flux are also examined.

Critical parameters for the ignition of dust layers at constant heat flux boundary conditions

1994 ◽  
Vol 13 (4) ◽  
pp. 210-213 ◽  
Author(s):  
Willi Hensel ◽  
Ulrich Krause ◽  
Wolfgang John ◽  
Klaus Machnow
Keyword(s):  
Heat Flux ◽  
Boundary Conditions ◽  
Constant Heat Flux ◽  
Critical Parameters ◽  
Constant Heat ◽  
Flux Boundary Conditions

Laminar Entropy Generation Over a Flat Plate With Isothermal and Constant Heat Flux Boundary Conditions Using the Von Ka´rma´n Integral Method

Volume 1 ◽  
2004 ◽  
Author(s):  
Eric B. Ratts ◽  
J. Steven Brown
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Boundary Conditions ◽  
Flat Plate ◽  
Entropy Generation ◽  
Single Phase ◽  
Constant Heat Flux ◽  
Constant Heat ◽  
Fundamental Study ◽  
Flux Boundary Conditions

This paper is a fundamental study on the irreversibility of single-phase laminar convective heat transfer over a flat plate with isothermal and constant heat flux boundary conditions. It quantifies the losses due to viscous momentum transfer losses and heat transfer losses and presents the irreversibility of the convective flow based on the entropy generation (EG) method. This paper determines the entropy generation for incompressible, single phase, laminar flow for large and small Prandtl numbers over a flat plate with isothermal and constant heat flux boundary conditions using von Ka´rma´n’s integral theory.

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