Numerical analysis of the influence of the physical viscosity on the vortex heat transfer in laminar and turbulent flows around a heated plate with a shallow spherical hole

2009 ◽  
Vol 82 (5) ◽  
pp. 847-859 ◽  
Author(s):  
S. A. Isaev ◽  
S. Z. Sapozhnikov ◽  
V. Yu. Mityakov ◽  
A. V. Mityakov ◽  
S. A. Mozhaiskii ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Turbulent Flows ◽  
Heated Plate ◽  
Laminar And Turbulent Flows

Heat transfer intensification for laminar and turbulent flows in a narrow channel with one-row oval dimples

2015 ◽  
Vol 53 (3) ◽  
pp. 375-386 ◽  
Author(s):  
S. A. Isaev ◽  
A. I. Leontiev ◽  
N. V. Kornev ◽  
E. Hassel ◽  
Ya. P. Chudnovskii
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Narrow Channel ◽  
Heat Transfer Intensification ◽  
Laminar And Turbulent Flows

Coupling of Convective and Radiative Heat Transfer in PV Cooling Ducts

2002 ◽  
Vol 124 (3) ◽  
pp. 250-255 ◽  
Author(s):  
B. J. Brinkworth
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Radiative Heat ◽  
Radiation Exchange ◽  
Axial Temperature ◽  
Pv Cooling ◽  
Cooling Air Flow ◽  
Cooling Air ◽  
Cooling Ducts ◽  
Laminar And Turbulent Flows

In a PV cooling duct, heat transfer from the heated side to the cooling air flow takes place partly by convection at the walls and partly by radiation exchange between them. A method is developed for representing these effects in combination, avoiding the uncertainties and iterations involved in treating the two mechanisms as independent and parallel. Though the radiative element introduces two further parameters, the procedure has a straightforward closed form, convenient for routine engineering calculations. An approximation, that treats the radiation exchange as determined by the local wall temperatures, is validated by comparison with published results in which the diffusion due to the axial temperature distribution is fully represented. The method is applicable to both laminar and turbulent flows, employing coefficients already available in the literature. The incorporation of duct heat transfer within thermal models of the PV installation is discussed briefly, highlighting further areas which are being refined by on-going work.

A Review of Forced Convective Heat Transfer in Stationary and Rotating Annuli

1996 ◽  
Vol 210 (2) ◽  
pp. 123-134 ◽  
Author(s):  
P R N Childs ◽  
C A Long
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Forced Convection ◽  
Turbulent Flows ◽  
Convective Heat ◽  
Heat Exchangers ◽  
Outer Cylinder ◽  
Forced Convective Heat Transfer ◽  
Analytical Research ◽  
Laminar And Turbulent Flows

The study of heat transfer by forced convection in annular passages is of interest across the range of process and aeronautical industries, for example from annular heat exchangers to the various configurations of annuli found in turbomachinery. The aim of this paper is to review relevant experimental, numerical and analytical research of heat transfer in both stationary and rotating annuli, with an emphasis on presenting useful information for designers. The geometries considered are the stationary annulus with superposed axial throughflow and the rotating annulus with rotation of either the inner or outer cylinder (both with and without throughflow). The work presented covers laminar and turbulent flows as well as flow regimes where transition occurs or vortex flows are present.

Gas–Solid Interfacial Heat Transfer Characteristics of Uncoated and Coated Metal Foams for Both Laminar and Turbulent Flow Regimes

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Peng Wenping ◽  
Xu Min ◽  
Huai Xiulan
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Heat Transfer Characteristic ◽  
Structural Parameters ◽  
Characteristic Curve ◽  
Transfer Characteristic ◽  
Metal Foams ◽  
Interfacial Heat Transfer ◽  
Coated Metal ◽  
Laminar And Turbulent Flows

Abstract Metal foams have been widely used in many fields requiring excellent heat and mass transfer performance such as heat exchangers and catalytic reactors. However, the movements of gas–solid interfacial heat transfer characteristic curve with the structural parameters of foams for uncoated metal foams and the washcoat thickness for coated metal foams are not explained in depth. In this work, gas–solid interfacial heat transfer characteristics of metal foams without and with a washcoat were studied in detail in both laminar and turbulent flows using the body-centered-cubic (BCC) unit cell model by the method of computational fluid dynamics, considering that the structural parameters of uncoated/coated foams could be accurately controlled in the numerical method. The movements of gas–solid interfacial heat transfer characteristic curve with the structural parameters of foams and the washcoat thickness were successfully verified and explained using the numerical data in both laminar and turbulent flows. The results show that the porosity not the pore/cell diameter is the reason of the moving of gas–solid interfacial heat transfer characteristic curve for uncoated/coated foams. In laminar flow, the porosity influences interfacial heat transfer characteristic curve through the effective thermal conduction of fluid phase; and in turbulent flow, interfacial heat transfer characteristic curve is affected by porosity through the inertial effect of flow. A new correlation of gas–solid interfacial heat transfer coefficient for uncoated/coated metal foams suitable for both laminar and turbulent flows was proposed by taking into consideration this phenomenon.

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