Migration of cadmium through a natural porous medium : Influence of the solid-liquid interface processes

2003 ◽  
Vol 107 ◽  
pp. 1057-1060
Author(s):  
M. Petrangeli Papini ◽  
A. Bianchi ◽  
P. Behra ◽  
M. Majone ◽  
M. Beccari
Keyword(s):  
Porous Medium ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Medium Influence

Analytical considerations of thermal storage and interface evolution of a PCM with/without porous media

2019 ◽  
Vol 30 (1) ◽  
pp. 373-400 ◽  
Author(s):  
Huijin Xu ◽  
Yan Wang ◽  
Xingchao Han
Keyword(s):  
Porous Medium ◽  
Metal Foam ◽  
Thermal Storage ◽  
Liquid Interface ◽  
Storage Device ◽  
Content Type ◽  
Foam Composite ◽  
Storage Rate ◽  
Solid Liquid Interface ◽  
Solid Liquid

Purpose Phase change energy storage is an important solution for overcoming human energy crisis. This study aims to present an evaluation for the thermal performances of a phase change material (PCM) and a PCM–metal foam composite. Effects of pore size, pore density, thermal conductivity of solid structure and mushy region on the thermal storage process are examined. Design/methodology/approach In this paper, temperature, flow field and solid–liquid interface of a PCM with or without porous media were theoretically assessed. The influences of basic parameters on the melting process were analyzed. A PCM thermal storage device with a metal foam composite is designed and a thermodynamic analysis for it is conducted. The optimal PCM temperature and the optimal HTF temperature in the metal foam-enhanced thermal storage device are derived. Findings The results show that the solid–liquid interface of pure PCM is a line area and that of the mixture PCM is a mushy area. The natural convection in the melting liquid is intensive for a PCM without porous medium. The porous medium weakens the natural convection and makes the temperature field, flow field and solid–liquid interface distribution more homogeneous. The metal foam can greatly improve the heat storage rate of a PCM. Originality/value Thermal storage rate of a PCM is compared with that of a PCM–metal foam composite. A thermal analysis is performed on the multi-layered parallel-plate thermal storage device with a PCM embedded in a highly conductive porous medium, and an optimal melting temperature is obtained with the exergy optimization. The heat transfer enhancement with metal foams proved to be necessary for the thermal storage application.

Competitive transport of cadmium and lead through a natural porous medium: influence of the solid/liquid interface processes

2003 ◽  
Vol 48 (3) ◽  
pp. 9-16 ◽  
Author(s):  
A. Bianchi ◽  
M. Petrangeli Papini ◽  
A. Corsi ◽  
P. Behra ◽  
M. Beccari
Keyword(s):  
Liquid Interface ◽  
Equilibrium Adsorption ◽  
Adsorption Model ◽  
Adsorption Sites ◽  
Advection Dispersion ◽  
Transport Behaviour ◽  
Cadmium And Lead ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Medium Influence

Contaminated groundwater typically contains different metal contaminants which may compete with each other for the same adsorption sites. Understanding the fate of these micro-pollutants is of primary importance for the assessment of the risk associated with their dispersion in the environment and for the evaluation of the most appropriate remediation technology. In this regard, column techniques can be considered as useful tools both to perform transport experiments and to obtain equilibrium adsorption data without any perturbation of the actual solid/liquid interface. Cd and Pb monocomponent step column experiments were used to obtain adsorption isotherms on a natural aquifer material. A General Composite approach was used to define the equilibrium adsorption model characterized by two types of sites (ion-exchange and surface complexation sites). Coupling the adsorption model with the Advection-Dispersion equation (by IMPACT code) allowed us to well represent the monocomponent step experiments. The model was successfully used to predict the competitive Cd and Pb transport behaviour. Cd peaks of concentration due to Pb competition were experimentally observed and simulated by the model. This behaviour can be described only by an accurate modelling of the interaction and cannot be predicted by simple isotherms (such as Langmuir or Freundlich type).

Observation of Femtosecond Acoustic Anomaly in a Solid Liquid Interface

2020 ◽  
Vol 124 (5) ◽  
pp. 2987-2993
Author(s):  
Chi-Kuang Sun ◽  
Yi-Ting Yao ◽  
Chih-Chiang Shen ◽  
Mu-Han Ho ◽  
Tien-Chang Lu ◽  
...  
Keyword(s):  
Liquid Interface ◽  
Acoustic Anomaly ◽  
Solid Liquid Interface ◽  
Solid Liquid
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