THEORY OF BOILING HEAT TRANSFER ON A CAPILLARY-POROUS SURFACE

1990 ◽  
Author(s):  
S. A. Kovalev ◽  
S. L. Solov'ev ◽  
O. A. Ovodkov
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Porous Surface

Research on Manufacturing Technology and Heat Transfer Characteristics of Sintered Porous Surface Tubes

2010 ◽  
Vol 97-101 ◽  
pp. 1161-1165 ◽  
Author(s):  
Xue Sheng Wang ◽  
Zheng Bian Wang ◽  
Qin Zhu Chen
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Base Material ◽  
Porous Surface ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Bronze Powder ◽  
New Process ◽  
Porous Surfaces ◽  
Heat Transfers

A new process for manufacturing sintered porous surface tube has been developed. By using this technology, three kinds of sintered porous surface tubes were fabricated, which base material was carbon steel and the sintered layer was bronze powder. And their boiling heat transfer characteristics were investigated experimentally. The experimental results indicated that the boiling heat transfers coefficient and the heat flux of these porous surfaces tubes were increased by 8~14 times and 5~8 times respectively compared with the smooth one. Finally, a new high flux heat exchanger was designed and applied instead of conventional one in a refinery.

Pool boiling heat transfer with nano-porous surface

2010 ◽  
Vol 53 (19-20) ◽  
pp. 4274-4279 ◽  
Author(s):  
Chi Young Lee ◽  
Md Mainul Hossain Bhuiya ◽  
Kwang J. Kim
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Porous Surface ◽  
Pool Boiling Heat Transfer

Effects of Pore Diameters and System Pressure on Saturated Pool Nucleate Boiling Heat Transfer From Porous Surfaces

1982 ◽  
Vol 104 (2) ◽  
pp. 286-291 ◽  
Author(s):  
W. Nakayama ◽  
T. Daikoku ◽  
T. Nakajima
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Bubble Formation ◽  
Nucleate Boiling ◽  
High Heat ◽  
Porous Surface ◽  
Operational Parameters ◽  
High Heat Transfer ◽  
System Pressure ◽  
Nucleate Boiling Heat Transfer

The porous surface structure was manufactured with precision for the experimental study of nucleate boiling heat transfer in R-11. Boiling curves and the data of bubble formation were obtained with a variety of geometrical and operational parameters; the pore diameters were of 50, 100, 150 μm, there was a combination of pores of different sizes; and the system pressures were of 0.04, 0.1, 0.23 MPa. The boiling curves exhibit certain trends effected by the diameter and population density of pores. A combination of high system pressure and pore sizes of 100 or 150 μm dia enables boiling to persist even when the wall superheat is reduced to an extremely low level of 0.1 K. A noteworthy feature of porous surface boiling is that intense bubble formation does not necessarily yield a high heat-transfer performance. Examination of the data indicates that liquid suction and evaporation inside the cavities are a proable mechanism of boiling with small temperature differences.

Experimental Study on Pool Boiling Heat Transfer Characteristics of Porous Surface Tube

2012 ◽  
Vol 192 ◽  
pp. 24-28 ◽  
Author(s):  
Yong Li ◽  
Ke Long Zhang ◽  
Hai Kun Tao ◽  
Wei Jian Lv
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Heat Removal ◽  
Porous Surface ◽  
Heat Transfer Characteristics ◽  
Pool Boiling Heat Transfer ◽  
Transfer Characteristics ◽  
Smooth Tubes ◽  
Boiling Heat Transfer Coefficient

The pooling boiling plays an important role in the operation of the passive residual heat removal heat exchanger (PRHR HX). At present, smooth tubes are still widely used as boiling element in the PRHR HX; there is great extension to improve the security and miniaturize the size of PRHR HX if the smooth tubes were replaced by porous surface tubes. In this paper, the pool boiling heat transfer characteristics of porous surface tube was researched experimentally. The result shows that the porous surface tube can enhance the pooling boiling significantly: Compared with the smooth tube, the porous surface tube can greatly reduced the time before the water reached saturation; the wall superheat decreases about 1.5°C and the boiling heat transfer coefficient increases 68% to 75%. Besides, the enhanced mechanism of the porous surface tubes is also discussed in this paper.

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