scholarly journals Three phase heat and mass transfer model for unsaturated soil freezing process: Part 2 - model validation

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 84-92 ◽  
Author(s):  
Yaning Zhang ◽  
Fei Xu ◽  
Bingxi Li ◽  
Yong-Song Kim ◽  
Wenke Zhao ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Unsaturated Soil ◽  
Correlation Coefficients ◽  
Soil Freezing ◽  
Freezing Process ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
Three Phase ◽  
Water Contents

AbstractThis study aims to validate the three-phase heat and mass transfer model developed in the first part (Three phase heat and mass transfer model for unsaturated soil freezing process: Part 1 - model development). Experimental results from studies and experiments were used for the validation. The results showed that the correlation coefficients for the simulated and experimental water contents at different soil depths were between 0.83 and 0.92. The correlation coefficients for the simulated and experimental liquid water contents at different soil temperatures were between 0.95 and 0.99. With these high accuracies, the developed model can be well used to predict the water contents at different soil depths and temperatures.

scholarly journals Three phase heat and mass transfer model for unsaturated soil freezing process: Part 1 - model development

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Fei Xu ◽  
Yaning Zhang ◽  
Guangri Jin ◽  
Bingxi Li ◽  
Yong-Song Kim ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Water Content ◽  
Heat And Mass Transfer ◽  
Unsaturated Soil ◽  
Liquid Water ◽  
Soil Freezing ◽  
Freezing Process ◽  
Moisture Migration ◽  
Water Fraction ◽  
Three Phase

Abstract A three-phase model capable of predicting the heat transfer and moisture migration for soil freezing process was developed based on the Shen-Chen model and the mechanisms of heat and mass transfer in unsaturated soil freezing. The pre-melted film was taken into consideration, and the relationship between film thickness and soil temperature was used to calculate the liquid water fraction in both frozen zone and freezing fringe. The force that causes the moisture migration was calculated by the sum of several interactive forces and the suction in the pre-melted film was regarded as an interactive force between ice and water. Two kinds of resistance were regarded as a kind of body force related to the water films between the ice grains and soil grains, and a block force instead of gravity was introduced to keep balance with gravity before soil freezing. Lattice Boltzmann method was used in the simulation, and the input variables for the simulation included the size of computational domain, obstacle fraction, liquid water fraction, air fraction and soil porosity. The model is capable of predicting the water content distribution along soil depth and variations in water content and temperature during soil freezing process.

A Study of GOTHIC 8.0 Code Application to AP1000 Containment Response

2013 ◽  
Author(s):  
Guodong Wang ◽  
Zhe Wang
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Mass Transfer Process ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
Containment Model ◽  
Evaporation Heat ◽  
Containment Shell ◽  
Film Heat Transfer ◽  
Inside Wall

The AP1000 containment model has been developed by using WGOTHIC version 4.2 code. Condensation heat and mass transfer from the volumes to the containment shell, conduction through the shell, and evaporation from the shell to the riser were all calculated by using the special CLIMEs model. In this paper, the latest GOTHIC version 8.0 code is used to model both condensation and evaporation heat and mass transfer process. An improved heat and mass transfer model, the diffusion layer model (DLM), is adopted to model the condensation on the inside wall of containment. The Film heat transfer coefficient option is used to model the evaporation on the outside wall of containment. As a preliminary code consolidation effort, it is possible to use GOTHIC 8.0 code as a tool to analysis the AP1000 containment response.

Sign in / Sign up

Export Citation Format

Share Document