scholarly journals A novel scheme for simulating the effect of microstructure surface roughness on the heat transfer characteristics of subcooled flow boiling

2020 ◽  
pp. 100829
Author(s):  
Hasan Alimoradi ◽  
Mehrzad Shams ◽  
Nasser Ashgriz ◽  
Ali Bozorgnezhad
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Flow Boiling ◽  
Heat Transfer Characteristics ◽  
Subcooled Flow Boiling ◽  
Transfer Characteristics ◽  
Subcooled Flow ◽  
Effect Of Microstructure

Subcooled Flow Boiling Critical Heat Flux in Short Vertical Tube: Influence of Inner Surface Roughness

2004 ◽  
Author(s):  
Koichi Hata ◽  
Masahiro Shiotsu ◽  
Nobuaki Noda
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Flow Boiling ◽  
Vertical Tube ◽  
Heat Transfer Characteristics ◽  
Subcooled Flow Boiling ◽  
Transfer Characteristics ◽  
Subcooled Flow ◽  
Wide Range ◽  
Inner Surface

The subcooled flow boiling CHF and the heat transfer characteristics for the flow velocities (u=4.0 to 13.3 m/s), the inlet subcoolings (ΔTsub,in=137.49 to 153.87 K), the inlet pressure (Pin=740.67 to 975.78 kPa) and the dissolved oxygen concentration (O=8.63 to 0.0288 ppm) are systematically measured by the experimental water loop installed the pressurizer. The SUS304 tubes of d=3 mm and L=66.5 mm (L/d=22.17) with the inner surfaces of smooth and mirror finished are mainly used in this work. Heat transfer characteristics and CHF data are compared with those for the rough finished inner surface (RF) previously obtained and the CHFs are compared with the values calculated by the CHF correlations against outlet and inlet subcoolings based on the experimental data for the rough finished inner surface under the N2 gas pressure. The influence of inner surface roughness on the heat transfer characteristics and the CHFs for wide range of dissolved gas concentration are investigated in detail.

Subcooled Flow Boiling Heat Transfer in Volumetrically Heated Packed Bed

2014 ◽  
Author(s):  
Xu Guangzhan ◽  
Zhongning Sun ◽  
Xianke Meng ◽  
Xiaoning Zhang ◽  
Jiqiang Su ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Packed Bed ◽  
Heat Transfer Characteristics ◽  
Subcooled Flow Boiling ◽  
Transfer Characteristics ◽  
Subcooled Flow ◽  
Flow Boiling Heat Transfer ◽  
Steel Balls

The volumetrically heated packed bed has been widely utilized in modern industry, however, due to the variability and randomness of packed bed channels, flow boiling heat transfer characteristics is complex. To study subcooled flow boiling heat transfer characteristics of volumetrically heated packed bed, here electromagnetic induction heating method was used to heat the oxidized carbon steel balls adopted to stack packed bed, while water was utilized as refrigerant in the experiment. The mass flux and heat flux effects on the subcooled flow boiling heat transfer were analyzed. A new correlation was developed to predict the subcooled flow boiling heat transfer coefficient in volumetrically heated packed bed.

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