Effects of ultrasonic waves on natural convection, nucleate boiling, and film boiling heat transfer from a wire to a saturated liquid

1992 ◽  
Vol 5 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Yoshihiro Iida ◽  
Kentarou Tsutsui
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Ultrasonic Waves ◽  
Film Boiling ◽  
Saturated Liquid

scholarly journals Boiling Heat Transfer With Cryogenic Fluids at Standard, Fractional, and Near-Zero Gravity

1964 ◽  
Vol 86 (3) ◽  
pp. 351-358 ◽  
Author(s):  
H. Merte ◽  
J. A. Clark
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Test Time ◽  
Zero Gravity ◽  
Saturated Liquid ◽  
Cryogenic Fluids ◽  
Short Test ◽  
Minimum Heat

A study is reported of boiling heat transfer with saturated liquid nitrogen under atmospheric pressure at standard, fractional, and near-zero gravity. A drop-tower technique is used to achieve the reduced gravities. Because of the short test time available a transient technique using a sphere as a transient calorimeter is employed to obtain the heat-transfer data. This technique permits the ready acquisition of data in all boiling regimes from the film boiling region through nucleate boiling. Comparison is made with correlations for film boiling and for maximum and minimum heat flux and their corresponding Δtsat.

scholarly journals Film Boiling Heat Transfer Properties of Liquid Hydrogen in Natural Convection

2015 ◽  
Vol 67 ◽  
pp. 643-648 ◽  
Author(s):  
Y. Horie ◽  
Y. Shirai ◽  
M. Shiotsu ◽  
T. Matsuzawa ◽  
K. Yoneda ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Boiling Heat Transfer ◽  
Liquid Hydrogen ◽  
Film Boiling ◽  
Transfer Properties

scholarly journals ELETRIC FIELD ENHANCEMENT AND DETERIORATION OF BOILING HEAT TRANSFER AND CRITICAL HEAT FLUX IN DIELECTRIC FLUIDS

2001 ◽  
Vol 1 (1) ◽  
pp. 32
Author(s):  
P. M. Carrica ◽  
V. Masson
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Electric Fields ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Two Phase ◽  
Boiling Regime ◽  
Dielectric Fluids

We present the results of an experimental study of the effects of externally imposed electric fields on boiling heat transfer and critical heat flux (CHF) in dielectric fluids. The study comprises the analysis of geometries that, under the effects of electric fields, cause the bubbles either to be pushed toward the heater or away from it. A local phase detection probe was used to measure the void fraction and the interfacial impact rate near the heater. It was found that the critical heat flux can be either augmented or reduced with the application of an electric field, depending on the direction of . In addition, the heat transfer can be slightly enhanced or degraded depending on the heat flux. The study of the two-phase flow in nucleate boiling, only for the case of favorable dielectrophoretic forces, reveals that the application of an electric field reduces the bubble detection time and increases the detachment frequency. It also shows that the two-phase flow characteristics of the second film boiling regime resemble more a nucleate boiling regime than a film boiling regime.

An Experimental Study of Transition and Film Boiling Heat Transfer in Liquid-Saturated Porous Bed

1986 ◽  
Vol 108 (1) ◽  
pp. 117-124 ◽  
Author(s):  
S. Fukusako ◽  
T. Komoriya ◽  
N. Seki
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Circular Cylinder ◽  
Boiling Heat Transfer ◽  
Heating Surface ◽  
Local Maximum ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Experimental Investigations ◽  
Porous Bed

Experimental investigations of transition and film boiling in a liquid-saturated porous bed are reported. The porous bed contained in a vertical circular cylinder is made up of packed spherical beads whose diameters range from 1.0 to 16.5 mm, while the depth of the bed overlying the heating surface varies from 10 to 300 mm. Water and fluorocarbon refrigerants R-11 and R-113 are adopted as testing liquids. Special attention is focused on the effect of the diameter of spherical beads on boiling heat transfer in the transition boiling region. It is found that for the small bead diameters the steady boiling heat transfer rises monotonically with temperature from nucleate boiling through the film boiling region, without going through a local maximum.

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