Heat transfer during laminar flow in a vertical annular channel with a constant temperature of the outer wall

1977 ◽  
Vol 33 (1) ◽  
pp. 744-748
Author(s):  
S. N. Kanev ◽  
V. V. Ris ◽  
V. G. Sharov
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Constant Temperature ◽  
Annular Channel ◽  
Outer Wall

Heat Transfer in the Laminar Boundary Layer Over an Impulsively Started Flat Plate

1975 ◽  
Vol 97 (3) ◽  
pp. 482-484 ◽  
Author(s):  
C. B. Watkins
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Laminar Flow ◽  
Flat Plate ◽  
Constant Temperature ◽  
Laminar Boundary Layer ◽  
Temperature Difference ◽  
Thermal Boundary Layer ◽  
Numerical Solutions ◽  
Prandtl Numbers

Numerical solutions are described for the unsteady thermal boundary layer in incompressible laminar flow over a semi-infinite flat plate set impulsively into motion, with the simultaneous imposition of a constant temperature difference between the plate and the fluid. Results are presented for several Prandtl numbers.

Heat transfer and drag in the laminar flow of a gas with variable properties through an annular channel

1972 ◽  
Vol 22 (4) ◽  
pp. 452-457
Author(s):  
A. I. Lyubarskii ◽  
Yu. S. Skoropanov ◽  
V. P. Popov
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Annular Channel ◽  
Variable Properties

Numerical Investigation on Heat Transfer to Supercritical CO2 in Vertical Annular Channel

2016 ◽  
Author(s):  
Zhenxing Zhao ◽  
Jun Wu ◽  
Fan Bai ◽  
Qi Xiao ◽  
Chunhui Dai ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Supercritical Fluid ◽  
Annular Channel ◽  
Outer Wall ◽  
Wall Heat Transfer ◽  
Heat Transfer Characteristics ◽  
Heat Transfer Deterioration ◽  
Flow And Heat Transfer ◽  
Wall Heating

The special fluid flow and heat transfer characteristics of supercritical CO2 in a vertical annular channel have been numerically investigated. The AKN k-ε model was selected to model the turbulent flow and heat transfer of supercritical fluid. The three heating types were individual outer-wall heating, simultaneous outer/inner walls heating and outer-wall heating (inner-wall cooling) separately. The local heat transfer coefficients were obtained to investigate the influence of inner-wall thermal boundary conditions, supercritical fluid mass flux, fluid temperature and flow direction on outer-wall heat transfer phenomenon. The mechanisms of abnormal heat transfer and primary influence factors were analyzed by the detailed information on the flow, turbulence and thermal fields. When the supercritical fluid is in the large-property-variation (LPV) region and flows upward, the inner-wall thermal boundary condition obviously affects the heat transfer characteristics of outer wall. When supercritical fluid flows downward, the inner-wall boundary condition hardly affects the heat transfer phenomena of outer wall. The increase of inner-wall heating heat flux will result in the larger deterioration region and heat transfer decline on outer wall when the other conditions remain unchanged. When the heat transfer deterioration also appears on the inner wall with the increase in the inner-wall heat flux, the outer-wall heat transfer no longer decreases, but the deterioration region abruptly increases. However, as inner-wall cooling heat flux increases, the heat transfer deterioration phenomenon on outer wall will weaken gradually.

Turbulent Heat Transfer Studies in Annulus With Inner Cylinder Rotation

1977 ◽  
Vol 99 (1) ◽  
pp. 12-19 ◽  
Author(s):  
T. M. Kuzay ◽  
C. J. Scott
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Annular Channel ◽  
Outer Wall ◽  
Temperature Fields ◽  
Turbulent Heat Transfer ◽  
Experimental Investigations ◽  
Turbulent Heat ◽  
Radial Temperature ◽  
Axial Temperature

Experimental investigations of turbulent heat transfer are made in a large-gap annulus with both rotating and nonrotating inner cylinder. The vertical annular channel has an electrically heated outer wall; the inner wall is thermally and electrically insulated. The axial air flow is allowed to develop before rotation and heating are imparted. The resulting temperature fields are investigated using thermocouple probes located near the channel exit. The wall heat flux, wall axial temperature development, and radial temperature profiles are measured. For each axial Reynolds number, three heat flux rates are used. Excellent correlation is established between rotational and nonrotational Nusselt number. The proper correlation parameter is a physical quantity characterizing the flow helix. This parameter is the inverse, of the ratio of axial travel of the flow helix in terms of hydraulic diameter, per half revolution of the spinning wall.

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