scholarly journals The Laboratorial Research of Two-Phase Free Convection Devices for Cooling of Materials and Industrial Machines

2019 ◽  
Author(s):  
Yakov B. Gorelik ◽  
Artur H. Khabitov
Keyword(s):  
Free Convection ◽  
Two Phase

Two-Phase Boundary Layer Treatment for Subcooled Free-Convection Film Boiling Around a Body of Arbitrary Shape in a Porous Medium

1987 ◽  
Vol 109 (4) ◽  
pp. 997-1002 ◽  
Author(s):  
A. Nakayama ◽  
H. Koyama ◽  
F. Kuwahara
Keyword(s):  
Boundary Layer ◽  
Porous Medium ◽  
Free Convection ◽  
Phase Boundary ◽  
Flat Plate ◽  
Arbitrary Shape ◽  
Film Boiling ◽  
Two Phase ◽  
The One ◽  
Axisymmetric Bodies

The two-phase boundary layer theory was adopted to investigate subcooled free-convection film boiling over a body of arbitrary shape embedded in a porous medium. A general similarity variable which accounts for the geometric effect on the boundary layer length scale was introduced to treat the problem once for all possible two-dimensional and axisymmetric bodies. By virtue of this generalized transformation, the set of governing equations and boundary conditions for an arbitrary shape reduces into the one for a vertical flat plate already solved by Cheng and Verma. Thus, the numerical values furnished for a flat plate may readily be tranlsated for any particular body configuration of concern. Furthermore, an explicit Nusselt number expression in terms of the parameters associated with the degrees of subcooling and superheating has been established upon considering physical limiting conditions.

Thermal management for free convection of nanofluid using two phase model

2014 ◽  
Vol 194 ◽  
pp. 179-187 ◽  
Author(s):  
M. Sheikholeslami ◽  
M. Gorji-Bandpy ◽  
D.D. Ganji ◽  
Soheil Soleimani
Keyword(s):  
Free Convection ◽  
Thermal Management ◽  
Phase Model ◽  
Two Phase

The Effect of Subcooled Liquid on Laminar Film Boiling

1962 ◽  
Vol 84 (2) ◽  
pp. 149-155 ◽  
Author(s):  
E. M. Sparrow ◽  
R. D. Cess
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Transfer Problem ◽  
Film Boiling ◽  
Physical Parameters ◽  
Two Phase ◽  
Fixed Temperature ◽  
Subcooled Liquid ◽  
Flow And Heat Transfer ◽  
Parameter Ranges

Heat-transfer results for film boiling in the presence of a subcooled liquid have been determined analytically for the case of the isothermal vertical plate. The two-phase flow and heat-transfer problem which arises has been formulated exactly within the framework of boundary-layer theory, and free convection within the liquid has been accounted for. At a fixed temperature difference between surface and saturation, the effect of subcooling is to increase the heat transfer from the plate surface, with the magnitude of the increase being controlled by five physical parameters. Graphical presentation of the heat-transfer results is made for parametric values which correspond to water, but this information may be applied to other fluids having similar parameter ranges. For large subcooling, the heat transfer is essentially equal to that for pure free convection (no boiling), and the limits for this condition are given.

Secondary Flow Effects in High Tip Speed Free Convection

1987 ◽  
Vol 109 (1) ◽  
pp. 97-103 ◽  
Author(s):  
P. W. Eckels ◽  
J. H. Parker ◽  
A. Patterson
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
High Speed ◽  
Single Phase ◽  
Flow Boiling ◽  
Heat Fluxes ◽  
Secondary Flows ◽  
Heated Wall ◽  
Rotating Frame ◽  
Two Phase

Experimental analyses of the effects of secondary flows on heat transfer in high tip speed rotating apparatus are not readily available. This paper provides data on the heat transfer within two different test modules which were rotated at high speed with the heat transfer surfaces perpendicular and parallel to the Coriolis acceleration. One module contained a heated wall and another a parallel plate free convection experiment. Uniform heat fluxes were maintained. Rayleigh numbers in excess of 1015 were achieved with liquid helium as the transfer medium. Some of the findings are that secondary flows can reduce heat transfer by as much as 60 percent in single-phase heat transfer, the transitions to fully turbulent flow are in agreement with existing prediction methods, the critical heat flux in two-phase flow boiling is significantly increased, forced convection correlations underpredict single-phase thermosyphon performance, and the usual nondimensional parameters of free convection establish similitude between various fluids and speeds. These results suggest that techniques used to enhance heat transfer in the rotating frame should be verified by tests in the rotating frame.

scholarly journals Numerical solution of Stokes problem for free convection effects in dissipative dusty medium

2004 ◽  
Vol 2004 (72) ◽  
pp. 3975-3988 ◽  
Author(s):  
V. Venkataraman ◽  
K. Kannan
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Skin Friction ◽  
Stokes Problem ◽  
Temperature Fields ◽  
Dust Particles ◽  
Two Phase ◽  
Dusty Fluid ◽  
Dissipative Heat ◽  
Phase Fluid

The flow past an infinite vertical isothermal plate started impulsively in its own plane in a viscous incompressible two-phase fluid has been considered by taking into account the viscous dissipative heat. The coupled nonlinear equations governing the flow are solved for fluid and particle phases by finite difference method. The velocity and temperature fields have been shown graphically forGbeing positive for dusty air and it was observed that the same results hold for water. (Gdenotes the Grashof number andG>0corresponds to cooling of the plate by free convection currents.) The results forG<0(heating of the plate) have been verified and discussed. The numerical values of skin friction and the rate of heat transfer of dusty fluid are shown in tables. The effects ofGandE(the Eckert number) on the flow field are discussed. It is observed that dusty fluid causes an increase in skin friction. The increase in mass concentration of dust particles decreases the heat transfer rate. The presence of inert particles does not admit the reverse type of flow even for large values oft.

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