Local Free Convection to Non-Newtonian Fluids From a Horizontal, Isothermal Cylinder

1974 ◽  
Vol 96 (1) ◽  
pp. 3-8 ◽  
Author(s):  
C. C. Gentry ◽  
D. E. Wollersheim
Keyword(s):  
Free Convection ◽  
Average Nusselt Number ◽  
Convection Heat Transfer ◽  
Empirical Models ◽  
Newtonian Fluids ◽  
Transfer Rates ◽  
Power Law Fluids ◽  
Free Convection Heat ◽  
Local Free Convection ◽  
Cylindrical Test

An experimental investigation of local free convection heat transfer rates from a horizontal, isothermal cylinder to non-Newtonian, power-law fluids has been conducted. Experimental data were obtained employing a cylindrical test section 2.304 in, dia and 8.018 in. long, constructed of twenty aluminum segments each independently, electrically heated. Non-Newtonian fluids utilized included four aqueous, carboxypolymethylene solutions. Both local and average Nusselt number results were compared with theoretical and empirical models.

An Experimental Study on the Effect of Partition Angle on Free Convection Heat Transfer in a Partition Cavity by Laser Interferometry Method

2010 ◽  
Author(s):  
Tooraj Yousefi ◽  
Sajjad Mahmoodi Nezhad ◽  
Masood Bigharaz ◽  
Saeed Ebrahimi
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Rayleigh Number ◽  
Free Convection ◽  
Average Nusselt Number ◽  
Convection Heat Transfer ◽  
Laser Interferometry ◽  
Heated Wall ◽  
Convection Heat ◽  
Free Convection Heat

Steady state two-dimensional free convection heat transfer in a partitioned cavity with adiabatic horizontal and isothermally vertical walls and an adiabatic partition has been investigated experimentally. The experiments have been carried out using a Mach-Zehnder interferometer. The effects of the angel of the adiabatic partition and Rayleigh number on the heat transfer from the heated wall are investigated. Experiments are performed for the values of Rayleigh number based on the cavity side length in the range between 1.5×105 to 4.5×105 and various angle of the partition with respect to horizon from 0° to 90°. The results indicate that at each angle of the adiabatic partition, by increasing the Rayleigh number, the average Nusselt number and heat transfer increase and at each Rayleigh number, the maximum and the minimum heat transfer occur at θ=45° and θ=90°, respectively. A correlation based on the experimental data for the average Nusselt number of the heated wall as a function of Rayleigh number and the angel of the adiabatic partition is presented in the aforementioned ranges.

Electrostatic Cooling of a Horizontal Cylinder

1991 ◽  
Vol 113 (3) ◽  
pp. 544-548 ◽  
Author(s):  
M. E. Franke ◽  
L. E. Hogue
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Convection Heat Transfer ◽  
Power Input ◽  
Horizontal Cylinder ◽  
Transfer Rates ◽  
Heated Cylinder ◽  
Free Convection Heat ◽  
Positively Charged ◽  
Corona Wind

The effects of corona wind on the heat transfer rate from a heated horizontal cylinder are described. Corona discharge and a corona wind are developed when a high voltage is applied to an electrode (emitter) near a grounded surface. In this study the corona wind is directed toward the lower region of the grounded cylinder by placing either a positively charged single-wire emitter or multipoint emitter parallel to and directly below the heated cylinder. Heat transfer rates from the heated cylinder under free convection conditions with and without a corona wind are obtained by measuring the power input to the cylinder. Free convection rates are also obtained from interferometer photographs. Free convection heat transfer rates are increased several times by the corona wind.

Free Convection Heat Transfer From Spheroids

1976 ◽  
Vol 98 (3) ◽  
pp. 452-458 ◽  
Author(s):  
G. D. Raithby ◽  
A. Pollard ◽  
K. T. G. Hollands ◽  
M. M. Yovanovich
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Large Range ◽  
Convection Heat Transfer ◽  
Prolate Spheroid ◽  
Correlation Equations ◽  
Transfer Rates ◽  
Oblate Spheroids ◽  
Free Convection Heat ◽  
Rayleigh Numbers

Measurements of the heat transfer by free convection from isothermal spheroids to air are reported. The range of Rayleigh number, Ra, covered was sufficiently large that both thick boundary layer effects (at low Ra) and turbulence (at high Ra) affect the heat transfer. Data are reported for one prolate spheroid and two oblate spheroids. The results of an approximate method of analysis, which accounts for both thick boundary layers and turbulence, are also given. These are compared to the present measurements, and to earlier measurements for spheres. Excellent agreement with experiment is found. Correlation equations, from which average heat transfer rates can be calculated, are also given. These are thought to be valid at all Rayleigh numbers over a large range of eccentricity.

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